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docItemCol_z5aJ"><div class="theme-doc-version-banner alert alert--warning margin-bottom--md" role=alert><div>This documentation is for an <b>unreleased</b> version of Apache Doris.</div><div class=margin-top--md>For usage, please refer to the official documentation of <b><a href=/docs/4.x/query-data/join/>Version 2.1</a></b> or <b><a href=/docs/3.x/gettingStarted/what-is-apache-doris/>Version 3.x</a></b>.</div></div><div class=docItemContainer_c0TR><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label=Breadcrumbs><ul class=breadcrumbs itemscope itemtype=https://schema.org/BreadcrumbList><li class=breadcrumbs__item><a aria-label="Home page" class=breadcrumbs__link href=/><svg viewBox="0 0 24 24" class=breadcrumbHomeIcon_YNFT><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill=currentColor /></svg></a><li class=breadcrumbs__item><span class=breadcrumbs__link>Guides</span><meta itemprop=position content=1><li class=breadcrumbs__item><span class=breadcrumbs__link>Data Queries</span><meta itemprop=position content=2><li itemscope itemprop=itemListElement itemtype=https://schema.org/ListItem class="breadcrumbs__item breadcrumbs__item--active"><span class=breadcrumbs__link itemprop=name>Join</span><meta itemprop=position content=3></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_bxCs"><button type=button class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Join</h1></header><h2 class="anchor anchorWithStickyNavbar_LWe7" id=what-is-join>What is JOIN<a href=#what-is-join class=hash-link aria-label="Direct link to What is JOIN" title="Direct link to What is JOIN"></a></h2> |
| <p>In relational databases, data is distributed across multiple tables, which are interconnected through specific relationships. SQL JOIN operations allow users to combine different tables into a more complete result set based on these relationships.</p> |
| <h2 class="anchor anchorWithStickyNavbar_LWe7" id=join-types-supported-by-doris>JOIN types supported by Doris<a href=#join-types-supported-by-doris class=hash-link aria-label="Direct link to JOIN types supported by Doris" title="Direct link to JOIN types supported by Doris"></a></h2> |
| <ul> |
| <li> |
| <p><strong>INNER JOIN</strong>: Comparing each row of the left table with all rows of the right table based on the JOIN condition, returning matching rows from both tables. For more details, refer to the syntax definition for JOIN queries in <a href=/docs/dev/query-data/sql-manual/sql-statements/data-query/SELECT/>SELECT</a>.</p> |
| </li> |
| <li> |
| <p><strong>LEFT JOIN</strong>: Building on the result set of an INNER JOIN, if a row from the left table does not have a match in the right table, all rows from the left table are returned, with corresponding columns from the right table shown as NULL.</p> |
| </li> |
| <li> |
| <p><strong>RIGHT JOIN</strong>: The opposite of LEFT JOIN; if a row from the right table does not have a match in the left table, all rows from the right table are returned, with corresponding columns from the left table shown as NULL.</p> |
| </li> |
| <li> |
| <p><strong>FULL JOIN</strong>: Building on the result set of an INNER JOIN, returning all rows from both tables, filling in NULL where there are no matches.</p> |
| </li> |
| <li> |
| <p><strong>CROSS JOIN</strong>: Having no JOIN condition, returning the Cartesian product of the two tables, where each row from the left table is combined with each row from the right table.</p> |
| </li> |
| <li> |
| <p><strong>LEFT SEMI JOIN</strong>: Comparing each row of the left table with all rows of the right table based on the JOIN condition. If a match exists, the corresponding row from the left table is returned.</p> |
| </li> |
| <li> |
| <p><strong>RIGHT SEMI JOIN</strong>: The opposite of LEFT SEMI JOIN; comparing each row of the right table with all rows of the left table, returning the corresponding row from the right table if a match exists.</p> |
| </li> |
| <li> |
| <p><strong>LEFT ANTI JOIN</strong>: Comparing each row of the left table with all rows of the right table based on the JOIN condition. If there is no match, the corresponding row from the left table is returned.</p> |
| </li> |
| <li> |
| <p><strong>RIGHT ANTI JOIN</strong>: The opposite of LEFT ANTI JOIN; comparing each row of the right table with all rows of the left table, returning rows from the right table that do not have matches.</p> |
| </li> |
| <li> |
| <p><strong>NULL AWARE LEFT ANTI JOIN</strong>: Similar to LEFT ANTI JOIN but ignoring rows in the left table where the matching column is NULL.</p> |
| </li> |
| </ul> |
| <h2 class="anchor anchorWithStickyNavbar_LWe7" id=implementation-of-join-in-doris>Implementation of JOIN in Doris<a href=#implementation-of-join-in-doris class=hash-link aria-label="Direct link to Implementation of JOIN in Doris" title="Direct link to Implementation of JOIN in Doris"></a></h2> |
| <p>Doris supports two implementation methods for JOIN: <strong>Hash Join</strong> and <strong>Nested Loop Join</strong>.</p> |
| <ul> |
| <li><strong>Hash Join</strong>: A hash table is built on the right table based on the equality JOIN columns, and the data from the left table is streamed through this hash table for JOIN calculations. This method is limited to cases where equality JOIN conditions are applicable.</li> |
| <li><strong>Nested Loop Join</strong>: This method uses two nested loops, driven by the left table, to iterate through each row of the left table and compare it with every row of the right table based on the JOIN condition. It is suitable for all JOIN scenarios, including those that Hash Join cannot handle, such as queries involving GREATER THAN or LESS THAN comparisons, or cases requiring Cartesian products. However, compared to Hash Join, Nested Loop Join may have inferior performance.</li> |
| </ul> |
| <h3 class="anchor anchorWithStickyNavbar_LWe7" id=implementation-of-hash-join-in-doris>Implementation of Hash Join in Doris<a href=#implementation-of-hash-join-in-doris class=hash-link aria-label="Direct link to Implementation of Hash Join in Doris" title="Direct link to Implementation of Hash Join in Doris"></a></h3> |
| <p>As a distributed MPP database, Apache Doris requires data shuffling during the Hash Join process to ensure the correctness of the JOIN results. Below are several data shuffling methods:</p> |
| <p><strong>Broadcast Join</strong> As illustrated, the Broadcast Join process involves sending all data from the right table to all nodes participating in the JOIN computation, including the nodes scanning the left table's data, while the left table's data remains stationary. In this process, each node receives a complete copy of the right table's data (with a total volume of T(R)) to ensure that all nodes have the necessary data to perform the JOIN operation.</p> |
| <p>This method is suitable for various scenarios but is not applicable for RIGHT OUTER, RIGHT ANTI, and RIGHT SEMI types of Hash Join. Its network overhead is calculated as the number of JOIN nodes N multiplied by the volume of right table's data T(R).</p> |
| <p><img decoding=async loading=lazy alt="Implementation of Hash Join in Doris" src=/assets/images/broadcast-join-1de67a712ee34e6c85a238f9988d33ab.jpg width=2560 height=1440 class=img_ev3q></p> |
| <h3 class="anchor anchorWithStickyNavbar_LWe7" id=partition-shuffle-join>Partition Shuffle Join<a href=#partition-shuffle-join class=hash-link aria-label="Direct link to Partition Shuffle Join" title="Direct link to Partition Shuffle Join"></a></h3> |
| <p>This method computes hash values based on the JOIN conditions and performs bucketing. Specifically, the data from both the left and right tables is partitioned according to the hash values calculated from the JOIN conditions, and these partitioned data sets are then sent to the corresponding partition nodes (as illustrated).</p> |
| <p>The network overhead of this method mainly includes two parts: the cost of transferring the left table's data T(S) and the cost of transferring the right table's data T(R). This method only supports Hash Join operations because it relies on the JOIN conditions to perform data bucketing.</p> |
| <p><img decoding=async loading=lazy alt="Partition Shuffle Join" src=/assets/images/partition-shuffle-join-e2ba9ef3db8c1fc6c05f849f364b60cf.jpg width=2560 height=1040 class=img_ev3q></p> |
| <h3 class="anchor anchorWithStickyNavbar_LWe7" id=bucket-shuffle-join>Bucket Shuffle Join<a href=#bucket-shuffle-join class=hash-link aria-label="Direct link to Bucket Shuffle Join" title="Direct link to Bucket Shuffle Join"></a></h3> |
| <p>When the JOIN condition includes the bucketed column from the left table, the left table's data location remains unchanged while the right table's data is distributed to the left table's nodes for the JOIN, reducing network overhead.</p> |
| <p>When one side of the table involved in the JOIN operation has its data already hash-distributed according to the JOIN condition column, users can choose to keep this side's data location unchanged while distributing the other side's data based on the same JOIN condition column and hash distribution. (The term "table" here refers not only to physically stored tables but also to the output results of any operators in SQL queries. Users can flexibly choose to keep either the left or right table's data location unchanged while only moving and distributing the other side's table.)</p> |
| <p>For example, in the case of physical tables of Doris, since the table data is stored in a bucketed manner through hash computation, users can directly leverage this feature to optimize the data shuffle process for the JOIN operation. Suppose you have two tables that need to be joined, and the JOIN column is the bucketed column from the left table. In this case, you do not need to move the left table's data; you only need to distribute the right table's data to the appropriate locations based on the left table's bucket information to complete the JOIN computation.</p> |
| <p>The primary network overhead for this process comes from the movement of the right table's data, denoted as T(R).</p> |
| <p><img decoding=async loading=lazy alt="Bucket Shuffle Join" src=/assets/images/bucket-shuffle-join-b0e7449164fd95a4e77e2f412b057433.png width=2560 height=1040 class=img_ev3q></p> |
| <h3 class="anchor anchorWithStickyNavbar_LWe7" id=colocate-join>Colocate Join<a href=#colocate-join class=hash-link aria-label="Direct link to Colocate Join" title="Direct link to Colocate Join"></a></h3> |
| <p>Similar to Bucket Shuffle Join, if both tables involved in the Join are already distributed by Hash according to the Join condition columns, the Shuffle process can be skipped, and the Join calculation can be performed directly on the local data. This can be illustrated with physical tables:</p> |
| <p>When creating a table in Doris with the specification of DISTRIBUTED BY HASH, the system distributes data based on the Hash distribution key during data import. If the Hash distribution keys of both tables happen to match the Join condition columns, it can be said that the data in these two tables is already pre-distributed according to the Join requirements, eliminating the need for additional Shuffle operations. Therefore, during actual queries, the Join calculation can be executed directly on these two tables.</p> |
| <div class="theme-admonition theme-admonition-caution admonition_Gfwi alert alert--warning"><div class=admonitionHeading_f1Ed>caution</div><div class=admonitionContent_UjKb><p>For scenarios where Join is executed after directly scanning data, certain conditions must be met during table creation; please refer to the subsequent restrictions regarding Colocate Join between the two physical tables.</div></div> |
| <p><img decoding=async loading=lazy alt="Colocate Join" src=/assets/images/colocate-join-aeaa5438e3138f1a72e706a4fb54417a.png width=2560 height=800 class=img_ev3q></p> |
| <h2 class="anchor anchorWithStickyNavbar_LWe7" id=bucket-shuffle-join-vs-colocate-join>Bucket Shuffle Join VS Colocate Join<a href=#bucket-shuffle-join-vs-colocate-join class=hash-link aria-label="Direct link to Bucket Shuffle Join VS Colocate Join" title="Direct link to Bucket Shuffle Join VS Colocate Join"></a></h2> |
| <p>As mentioned earlier, for both Bucket Shuffle Join and Colocate Join, the join operations can be executed as long as the distribution of the participating tables meets specific conditions (the term "tables" here refers to any output from SQL query operators).</p> |
| <p>Next, we will provide a more detailed explanation of the generalized Bucket Shuffle Join and Colocate Join using two tables, t1 and t2, along with relevant SQL examples. First, here are the table creation statements for both tables:</p> |
| <div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#F8F8F2;--prism-background-color:#282A36><div class=codeBlockContent_biex><pre tabindex=0 class="prism-code language-sql codeBlock_bY9V thin-scrollbar" style=color:#F8F8F2;background-color:#282A36><code class=codeBlockLines_e6Vv><span class=token-line style=color:#F8F8F2><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">create</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">table</span><span class="token plain"> t1</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> c1 </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">bigint</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> </span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> c2 </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">bigint</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">DISTRIBUTED</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">BY</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">HASH</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> BUCKETS </span><span class="token number">3</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain">PROPERTIES </span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token string" style="color:rgb(255, 121, 198)">"replication_num"</span><span class="token plain"> </span><span class="token operator">=</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">"1"</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain" style=display:inline-block></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">create</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">table</span><span class="token plain"> t2</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> c1 </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">bigint</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> </span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> c2 </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">bigint</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">DISTRIBUTED</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">BY</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">HASH</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> BUCKETS </span><span class="token number">3</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain">PROPERTIES </span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token string" style="color:rgb(255, 121, 198)">"replication_num"</span><span class="token plain"> </span><span class="token operator">=</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">"1"</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><br></span></code></pre><div class=buttonGroup__atx><button type=button aria-label="Copy code to clipboard" title=Copy class=clean-btn><span class=copyButtonIcons_eSgA aria-hidden=true><svg viewBox="0 0 24 24" class=copyButtonIcon_y97N><path fill=currentColor d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"/></svg><svg viewBox="0 0 24 24" class=copyButtonSuccessIcon_LjdS><path fill=currentColor d=M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z /></svg></span></button></div></div></div> |
| <h3 class="anchor anchorWithStickyNavbar_LWe7" id=example-of-bucket-shuffle-join>Example of Bucket Shuffle Join<a href=#example-of-bucket-shuffle-join class=hash-link aria-label="Direct link to Example of Bucket Shuffle Join" title="Direct link to Example of Bucket Shuffle Join"></a></h3> |
| <p>In the following example, both tables t1 and t2 have been processed by the GROUP BY operator, resulting in new tables (at this point, the tx table is hash-distributed by c1, while the ty table is hash-distributed by c2). The subsequent JOIN condition is tx.c1 = ty.c2, which perfectly meets the conditions for a Bucket Shuffle Join.</p> |
| <div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#F8F8F2;--prism-background-color:#282A36><div class=codeBlockContent_biex><pre tabindex=0 class="prism-code language-sql codeBlock_bY9V thin-scrollbar" style=color:#F8F8F2;background-color:#282A36><code class=codeBlockLines_e6Vv><span class=token-line style=color:#F8F8F2><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">explain</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">select</span><span class="token plain"> </span><span class="token operator">*</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">from</span><span class="token plain"> </span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token comment" style="color:rgb(98, 114, 164)">-- The t1 table is hash-distributed by c1, and after the GROUP BY operator, it still maintains the hash distribution by c1.</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">select</span><span class="token plain"> c1 </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">as</span><span class="token plain"> c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">sum</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">as</span><span class="token plain"> c2</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">from</span><span class="token plain"> t1</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">group</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">by</span><span class="token plain"> c1 </span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> tx</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">join</span><span class="token plain"> </span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token comment" style="color:rgb(98, 114, 164)">-- The t2 table is hash-distributed by c1, but after the GROUP BY operator, the data is redistributed to be hash-distributed by c2.</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">select</span><span class="token plain"> c2 </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">as</span><span class="token plain"> c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">sum</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">as</span><span class="token plain"> c1</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">from</span><span class="token plain"> t2</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">group</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">by</span><span class="token plain"> c2 </span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> ty</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">on</span><span class="token plain"> tx</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token plain">c1 </span><span class="token operator">=</span><span class="token plain"> ty</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token plain">c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><br></span></code></pre><div class=buttonGroup__atx><button type=button aria-label="Copy code to clipboard" title=Copy class=clean-btn><span class=copyButtonIcons_eSgA aria-hidden=true><svg viewBox="0 0 24 24" class=copyButtonIcon_y97N><path fill=currentColor d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"/></svg><svg viewBox="0 0 24 24" class=copyButtonSuccessIcon_LjdS><path fill=currentColor d=M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z /></svg></span></button></div></div></div> |
| <p>From the following Explain execution plan, it can be observed that the left child node of the Hash Join node 7 is the aggregation node 6, while the right child node is the Exchange node 4. This indicates that the data from the left child node, after aggregation, remains in the same location, while the data from the right child node is distributed to the node where the left child node resides using the Bucket Shuffle method, in order to perform the subsequent Hash Join operation.</p> |
| <div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#F8F8F2;--prism-background-color:#282A36><div class=codeBlockContent_biex><pre tabindex=0 class="prism-code language-sql codeBlock_bY9V thin-scrollbar" style=color:#F8F8F2;background-color:#282A36><code class=codeBlockLines_e6Vv><span class=token-line style=color:#F8F8F2><span class="token operator">+</span><span class="token comment" style="color:rgb(98, 114, 164)">------------------------------------------------------------+</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">Explain</span><span class="token plain"> String</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">Nereids Planner</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">+</span><span class="token comment" style="color:rgb(98, 114, 164)">------------------------------------------------------------+</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">PLAN</span><span class="token plain"> FRAGMENT </span><span class="token number">0</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> OUTPUT EXPRS: </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#18] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#19] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#20] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#21] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">PARTITION</span><span class="token plain">: HASH_PARTITIONED: c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#8] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> HAS_COLO_PLAN_NODE: </span><span class="token boolean">true</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> VRESULT SINK </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> MYSQL_PROTOCAL </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token number">7</span><span class="token plain">:VHASH </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">JOIN</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token number">364</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">join</span><span class="token plain"> op: </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">INNER</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">JOIN</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">BUCKET_SHUFFLE</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> equal </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">join</span><span class="token plain"> conjunct: </span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#12] = c2[#6]) |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> cardinality</span><span class="token operator">=</span><span class="token number">10</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> vec output tuple id: </span><span class="token number">8</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> output tuple id: </span><span class="token number">8</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> vIntermediate tuple ids: </span><span class="token number">7</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">hash</span><span class="token plain"> output slot ids: </span><span class="token number">6</span><span class="token plain"> </span><span class="token number">7</span><span class="token plain"> </span><span class="token number">12</span><span class="token plain"> </span><span class="token number">13</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> final projections: c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#14], c2[#15], c2[#16], c1[#17] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> final project output tuple id: </span><span class="token number">8</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> distribute expr lists: c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#12] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> distribute expr lists: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#6] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token comment" style="color:rgb(98, 114, 164)">----4:VEXCHANGE |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">offset</span><span class="token plain">: </span><span class="token number">0</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> distribute expr lists: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#6] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token number">6</span><span class="token plain">:VAGGREGATE </span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">update</span><span class="token plain"> finalize</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token number">342</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> output: </span><span class="token function" style="color:rgb(80, 250, 123)">sum</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#9])[#11] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">group</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">by</span><span class="token plain">: c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#8] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> sortByGroupKey:</span><span class="token boolean">false</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> cardinality</span><span class="token operator">=</span><span class="token number">10</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> final projections: c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#10], c2[#11] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> final project output tuple id: </span><span class="token number">6</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> distribute expr lists: c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#8] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token number">5</span><span class="token plain">:VOlapScanNode</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token number">339</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">TABLE</span><span class="token plain">: tt</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token plain">t1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">t1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> PREAGGREGATION: </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">ON</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> partitions</span><span class="token operator">=</span><span class="token number">1</span><span class="token operator">/</span><span class="token number">1</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">t1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> tablets</span><span class="token operator">=</span><span class="token number">1</span><span class="token operator">/</span><span class="token number">1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> tabletList</span><span class="token operator">=</span><span class="token number">491188</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> cardinality</span><span class="token operator">=</span><span class="token number">21</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> avgRowSize</span><span class="token operator">=</span><span class="token number">0.0</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> numNodes</span><span class="token operator">=</span><span class="token number">1</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> pushAggOp</span><span class="token operator">=</span><span class="token plain">NONE </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">PLAN</span><span class="token plain"> FRAGMENT </span><span class="token number">1</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">PARTITION</span><span class="token plain">: HASH_PARTITIONED: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#2] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> HAS_COLO_PLAN_NODE: </span><span class="token boolean">true</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> STREAM </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">DATA</span><span class="token plain"> SINK </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> EXCHANGE ID: </span><span class="token number">04</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> BUCKET_SHFFULE_HASH_PARTITIONED: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#6] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token number">3</span><span class="token plain">:VAGGREGATE </span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">merge</span><span class="token plain"> finalize</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token number">355</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> output: </span><span class="token function" style="color:rgb(80, 250, 123)">sum</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">partial_sum</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#3])[#5] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">group</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">by</span><span class="token plain">: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#2] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> sortByGroupKey:</span><span class="token boolean">false</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> cardinality</span><span class="token operator">=</span><span class="token number">5</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> final projections: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#4], c1[#5] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> final project output tuple id: </span><span class="token number">3</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> distribute expr lists: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#2] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token number">2</span><span class="token plain">:VEXCHANGE </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">offset</span><span class="token plain">: </span><span class="token number">0</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> distribute expr lists: </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">PLAN</span><span class="token plain"> FRAGMENT </span><span class="token number">2</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">PARTITION</span><span class="token plain">: HASH_PARTITIONED: c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#0] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> HAS_COLO_PLAN_NODE: </span><span class="token boolean">false</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> STREAM </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">DATA</span><span class="token plain"> SINK </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> EXCHANGE ID: </span><span class="token number">02</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> HASH_PARTITIONED: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#2] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token number">1</span><span class="token plain">:VAGGREGATE </span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">update</span><span class="token plain"> serialize</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token number">349</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> STREAMING </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> output: partial_sum</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#0])[#3] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">group</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">by</span><span class="token plain">: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#1] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> sortByGroupKey:</span><span class="token boolean">false</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> cardinality</span><span class="token operator">=</span><span class="token number">5</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> distribute expr lists: c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#0] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token number">0</span><span class="token plain">:VOlapScanNode</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token number">346</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">TABLE</span><span class="token plain">: tt</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token plain">t2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">t2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> PREAGGREGATION: </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">ON</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> partitions</span><span class="token operator">=</span><span class="token number">1</span><span class="token operator">/</span><span class="token number">1</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">t2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> tablets</span><span class="token operator">=</span><span class="token number">1</span><span class="token operator">/</span><span class="token number">1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> tabletList</span><span class="token operator">=</span><span class="token number">491198</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> cardinality</span><span class="token operator">=</span><span class="token number">10</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> avgRowSize</span><span class="token operator">=</span><span class="token number">0.0</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> numNodes</span><span class="token operator">=</span><span class="token number">1</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> pushAggOp</span><span class="token operator">=</span><span class="token plain">NONE </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">Statistics</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> planed </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">with</span><span class="token plain"> unknown </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">column</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">statistics</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">+</span><span class="token comment" style="color:rgb(98, 114, 164)">------------------------------------------------------------+</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token number">97</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">rows</span><span class="token plain"> </span><span class="token operator">in</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">set</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token number">0.01</span><span class="token plain"> sec</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><br></span></code></pre><div class=buttonGroup__atx><button type=button aria-label="Copy code to clipboard" title=Copy class=clean-btn><span class=copyButtonIcons_eSgA aria-hidden=true><svg viewBox="0 0 24 24" class=copyButtonIcon_y97N><path fill=currentColor d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"/></svg><svg viewBox="0 0 24 24" class=copyButtonSuccessIcon_LjdS><path fill=currentColor d=M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z /></svg></span></button></div></div></div> |
| <h3 class="anchor anchorWithStickyNavbar_LWe7" id=example-of-colocate-join>Example of Colocate Join<a href=#example-of-colocate-join class=hash-link aria-label="Direct link to Example of Colocate Join" title="Direct link to Example of Colocate Join"></a></h3> |
| <p>In the following example, both tables t1 and t2 have been processed by the GROUP BY operator, resulting in new tables (at this point, both tx and ty are hash-distributed by c2). The subsequent JOIN condition is tx.c2 = ty.c2, which perfectly meets the conditions for a Colocate Join.</p> |
| <div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#F8F8F2;--prism-background-color:#282A36><div class=codeBlockContent_biex><pre tabindex=0 class="prism-code language-sql codeBlock_bY9V thin-scrollbar" style=color:#F8F8F2;background-color:#282A36><code class=codeBlockLines_e6Vv><span class=token-line style=color:#F8F8F2><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">explain</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">select</span><span class="token plain"> </span><span class="token operator">*</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">from</span><span class="token plain"> </span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token comment" style="color:rgb(98, 114, 164)">-- The t1 table is initially hash-distributed by c1, but after the GROUP BY operator, the data distribution changes to be hash-distributed by c2.</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">select</span><span class="token plain"> c2 </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">as</span><span class="token plain"> c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">sum</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">as</span><span class="token plain"> c1</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">from</span><span class="token plain"> t1</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">group</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">by</span><span class="token plain"> c2 </span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> tx</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">join</span><span class="token plain"> </span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token comment" style="color:rgb(98, 114, 164)">-- The t2 table is initially hash-distributed by c1, but after the GROUP BY operator, the data distribution changes to be hash-distributed by c2.</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">select</span><span class="token plain"> c2 </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">as</span><span class="token plain"> c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">sum</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">as</span><span class="token plain"> c1</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">from</span><span class="token plain"> t2</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">group</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">by</span><span class="token plain"> c2 </span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> ty</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">on</span><span class="token plain"> tx</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token plain">c2 </span><span class="token operator">=</span><span class="token plain"> ty</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token plain">c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><br></span></code></pre><div class=buttonGroup__atx><button type=button aria-label="Copy code to clipboard" title=Copy class=clean-btn><span class=copyButtonIcons_eSgA aria-hidden=true><svg viewBox="0 0 24 24" class=copyButtonIcon_y97N><path fill=currentColor d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"/></svg><svg viewBox="0 0 24 24" class=copyButtonSuccessIcon_LjdS><path fill=currentColor d=M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z /></svg></span></button></div></div></div> |
| <p>From the results of the following Explain execution plan, it can be seen that the left child node of Hash Join node 8 is aggregation node 7, and the right child node is aggregation node 3, with no Exchange node present. This indicates that the aggregated data from both the left and right child nodes remains in its original location, eliminating the need for data movement and allowing the subsequent Hash Join operation to be performed directly locally.</p> |
| <div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#F8F8F2;--prism-background-color:#282A36><div class=codeBlockContent_biex><pre tabindex=0 class="prism-code language-sql codeBlock_bY9V thin-scrollbar" style=color:#F8F8F2;background-color:#282A36><code class=codeBlockLines_e6Vv><span class=token-line style=color:#F8F8F2><span class="token operator">+</span><span class="token comment" style="color:rgb(98, 114, 164)">------------------------------------------------------------+</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">Explain</span><span class="token plain"> String</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">Nereids Planner</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">+</span><span class="token comment" style="color:rgb(98, 114, 164)">------------------------------------------------------------+</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">PLAN</span><span class="token plain"> FRAGMENT </span><span class="token number">0</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> OUTPUT EXPRS: </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#20] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#21] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#22] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#23] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">PARTITION</span><span class="token plain">: HASH_PARTITIONED: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#10] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> HAS_COLO_PLAN_NODE: </span><span class="token boolean">true</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> VRESULT SINK </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> MYSQL_PROTOCAL </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token number">8</span><span class="token plain">:VHASH </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">JOIN</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token number">373</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">join</span><span class="token plain"> op: </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">INNER</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">JOIN</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">PARTITIONED</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> equal </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">join</span><span class="token plain"> conjunct: </span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#14] = c2[#6]) |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> cardinality</span><span class="token operator">=</span><span class="token number">10</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> vec output tuple id: </span><span class="token number">9</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> output tuple id: </span><span class="token number">9</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> vIntermediate tuple ids: </span><span class="token number">8</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">hash</span><span class="token plain"> output slot ids: </span><span class="token number">6</span><span class="token plain"> </span><span class="token number">7</span><span class="token plain"> </span><span class="token number">14</span><span class="token plain"> </span><span class="token number">15</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> final projections: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#16], c1[#17], c2[#18], c1[#19] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> final project output tuple id: </span><span class="token number">9</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> distribute expr lists: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#14] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> distribute expr lists: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#6] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token comment" style="color:rgb(98, 114, 164)">----3:VAGGREGATE (merge finalize)(367) |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> output: </span><span class="token function" style="color:rgb(80, 250, 123)">sum</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">partial_sum</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#3])[#5] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">group</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">by</span><span class="token plain">: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#2] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> sortByGroupKey:</span><span class="token boolean">false</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> cardinality</span><span class="token operator">=</span><span class="token number">5</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> final projections: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#4], c1[#5] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> final project output tuple id: </span><span class="token number">3</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> distribute expr lists: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#2] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token number">2</span><span class="token plain">:VEXCHANGE </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">offset</span><span class="token plain">: </span><span class="token number">0</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> distribute expr lists: </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token number">7</span><span class="token plain">:VAGGREGATE </span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">merge</span><span class="token plain"> finalize</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token number">354</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> output: </span><span class="token function" style="color:rgb(80, 250, 123)">sum</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">partial_sum</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#11])[#13] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">group</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">by</span><span class="token plain">: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#10] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> sortByGroupKey:</span><span class="token boolean">false</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> cardinality</span><span class="token operator">=</span><span class="token number">10</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> final projections: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#12], c1[#13] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> final project output tuple id: </span><span class="token number">7</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> distribute expr lists: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#10] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token number">6</span><span class="token plain">:VEXCHANGE </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">offset</span><span class="token plain">: </span><span class="token number">0</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> distribute expr lists: </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">PLAN</span><span class="token plain"> FRAGMENT </span><span class="token number">1</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">PARTITION</span><span class="token plain">: HASH_PARTITIONED: c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#8] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> HAS_COLO_PLAN_NODE: </span><span class="token boolean">false</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> STREAM </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">DATA</span><span class="token plain"> SINK </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> EXCHANGE ID: </span><span class="token number">06</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> HASH_PARTITIONED: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#10] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token number">5</span><span class="token plain">:VAGGREGATE </span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">update</span><span class="token plain"> serialize</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token number">348</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> STREAMING </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> output: partial_sum</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#8])[#11] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">group</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">by</span><span class="token plain">: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#9] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> sortByGroupKey:</span><span class="token boolean">false</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> cardinality</span><span class="token operator">=</span><span class="token number">10</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> distribute expr lists: c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#8] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token number">4</span><span class="token plain">:VOlapScanNode</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token number">345</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">TABLE</span><span class="token plain">: tt</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token plain">t1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">t1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> PREAGGREGATION: </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">ON</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> partitions</span><span class="token operator">=</span><span class="token number">1</span><span class="token operator">/</span><span class="token number">1</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">t1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> tablets</span><span class="token operator">=</span><span class="token number">1</span><span class="token operator">/</span><span class="token number">1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> tabletList</span><span class="token operator">=</span><span class="token number">491188</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> cardinality</span><span class="token operator">=</span><span class="token number">21</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> avgRowSize</span><span class="token operator">=</span><span class="token number">0.0</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> numNodes</span><span class="token operator">=</span><span class="token number">1</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> pushAggOp</span><span class="token operator">=</span><span class="token plain">NONE </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">PLAN</span><span class="token plain"> FRAGMENT </span><span class="token number">2</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">PARTITION</span><span class="token plain">: HASH_PARTITIONED: c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#0] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> HAS_COLO_PLAN_NODE: </span><span class="token boolean">false</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> STREAM </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">DATA</span><span class="token plain"> SINK </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> EXCHANGE ID: </span><span class="token number">02</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> HASH_PARTITIONED: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#2] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token number">1</span><span class="token plain">:VAGGREGATE </span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">update</span><span class="token plain"> serialize</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token number">361</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> STREAMING </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> output: partial_sum</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#0])[#3] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">group</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">by</span><span class="token plain">: c2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#1] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> sortByGroupKey:</span><span class="token boolean">false</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> cardinality</span><span class="token operator">=</span><span class="token number">5</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> distribute expr lists: c1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token comment" style="color:rgb(98, 114, 164)">#0] |</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token number">0</span><span class="token plain">:VOlapScanNode</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token number">358</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">TABLE</span><span class="token plain">: tt</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token plain">t2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">t2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> PREAGGREGATION: </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">ON</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> partitions</span><span class="token operator">=</span><span class="token number">1</span><span class="token operator">/</span><span class="token number">1</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">t2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> tablets</span><span class="token operator">=</span><span class="token number">1</span><span class="token operator">/</span><span class="token number">1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> tabletList</span><span class="token operator">=</span><span class="token number">491198</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> cardinality</span><span class="token operator">=</span><span class="token number">10</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> avgRowSize</span><span class="token operator">=</span><span class="token number">0.0</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> numNodes</span><span class="token operator">=</span><span class="token number">1</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> pushAggOp</span><span class="token operator">=</span><span class="token plain">NONE </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">Statistics</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">|</span><span class="token plain"> planed </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">with</span><span class="token plain"> unknown </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">column</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">statistics</span><span class="token plain"> </span><span class="token operator">|</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token operator">+</span><span class="token comment" style="color:rgb(98, 114, 164)">------------------------------------------------------------+</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token number">105</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">rows</span><span class="token plain"> </span><span class="token operator">in</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">set</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token number">0.06</span><span class="token plain"> sec</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><br></span></code></pre><div class=buttonGroup__atx><button type=button aria-label="Copy code to clipboard" title=Copy class=clean-btn><span class=copyButtonIcons_eSgA aria-hidden=true><svg viewBox="0 0 24 24" class=copyButtonIcon_y97N><path fill=currentColor d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"/></svg><svg viewBox="0 0 24 24" class=copyButtonSuccessIcon_LjdS><path fill=currentColor d=M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z /></svg></span></button></div></div></div> |
| <h2 class="anchor anchorWithStickyNavbar_LWe7" id=comparison-of-four-shuffle-methods>Comparison of four shuffle methods<a href=#comparison-of-four-shuffle-methods class=hash-link aria-label="Direct link to Comparison of four shuffle methods" title="Direct link to Comparison of four shuffle methods"></a></h2> |
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| <table><thead><tr><th>Shuffle Methods<th>Network Overhead<th>Physical Operator<th>Applicable Scenarios<tbody><tr><td>Broadcast<td>N * T(R)<td>Hash Join /Nest Loop Join<td>General<tr><td>Shuffle<td>T(S) + T(R)<td>Hash Join<td>General<tr><td>Bucket Shuffle<td>T(R)<td>Hash Join<td>JOIN condition includes the left table's bucketed column, with the left table being single-partitioned.<tr><td>Colocate<td>0<td>Hash Join<td>JOIN condition includes the left table's bucketed column, and both tables belong to the same Colocate Group.</table> |
| <div class="theme-admonition theme-admonition-info admonition_Gfwi alert alert--info"><div class=admonitionHeading_f1Ed>NOTE</div><div class=admonitionContent_UjKb><p>N: Number of instances participating in the Join calculation<p>T(Relation): Number of tuples in the relation</div></div> |
| <p>The flexibility of the four Shuffle methods decreases in order, and their requirements for data distribution become increasingly strict. In most cases, as the requirements for data distribution increase, the performance of Join calculations tends to improve gradually. It is important to note that if the number of buckets in a table is small, Bucket Shuffle or Colocate Join may experience a decrease in performance due to lower parallelism, potentially resulting in slower performance than Shuffle Join. This is because the Shuffle operation can more effectively balance data distribution, thereby providing higher parallelism in subsequent processing.</p> |
| <h2 class="anchor anchorWithStickyNavbar_LWe7" id=faq>FAQ<a href=#faq class=hash-link aria-label="Direct link to FAQ" title="Direct link to FAQ"></a></h2> |
| <p>Bucket Shuffle Join and Colocate Join have specific limitations regarding data distribution and JOIN conditions when applied. Below, we will elaborate on the specific restrictions for each of these JOIN methods.</p> |
| <h3 class="anchor anchorWithStickyNavbar_LWe7" id=limitations-of-bucket-shuffle-join>Limitations of Bucket Shuffle Join<a href=#limitations-of-bucket-shuffle-join class=hash-link aria-label="Direct link to Limitations of Bucket Shuffle Join" title="Direct link to Limitations of Bucket Shuffle Join"></a></h3> |
| <p>When directly scanning two physical tables for a Bucket Shuffle Join, the following conditions must be met:</p> |
| <ol> |
| <li> |
| <p><strong>Equality Join condition</strong>: Bucket Shuffle Join is only applicable for scenarios where the JOIN condition is based on equality, as it relies on hash calculations to determine data distribution.</p> |
| </li> |
| <li> |
| <p><strong>Inclusion of bucketed columns in equality conditions</strong>: The equality JOIN condition must include the bucketed columns from both tables. When the left table's bucketed column is used as the equality JOIN condition, it is more likely to be planned as a Bucket Shuffle Join.</p> |
| </li> |
| <li> |
| <p><strong>Table type restrictions</strong>: Bucket Shuffle Join is only applicable to native OLAP tables in Doris. For external tables such as ODBC, MySQL, and ES, Bucket Shuffle Join cannot be effective when they are used as the left table.</p> |
| </li> |
| <li> |
| <p><strong>Single Partition Requirement</strong>: For partitioned tables, since the data distribution may differ across partitions, Bucket Shuffle Join is only guaranteed to be effective when the left table is a single partition. Therefore, when executing SQL, it is advisable to use <code>WHERE</code> conditions to enable partition pruning strategies whenever possible.</p> |
| </li> |
| </ol> |
| <h3 class="anchor anchorWithStickyNavbar_LWe7" id=limitations-of-colocate-join>Limitations of Colocate Join<a href=#limitations-of-colocate-join class=hash-link aria-label="Direct link to Limitations of Colocate Join" title="Direct link to Limitations of Colocate Join"></a></h3> |
| <p>When directly scanning two physical tables, Colocate Join has stricter limitations compared to Bucket Shuffle Join. In addition to meeting all the conditions for Bucket Shuffle Join, the following requirements must also be satisfied:</p> |
| <ol> |
| <li> |
| <p><strong>bucket column types and counts are Same</strong>: Not only must the types of the bucketed columns match, but the number of buckets must also be the same to ensure data distribution consistency.</p> |
| </li> |
| <li> |
| <p><strong>Explicit specification of Colocation Group</strong>: A Colocation Group must be explicitly specified; only tables within the same Colocation Group can participate in a Colocate Join.</p> |
| </li> |
| <li> |
| <p><strong>Unstable state during replica repair or balancing</strong>: During operations such as replica repair or balancing, the Colocation Group may be in an unstable state. In this case, the Colocate Join will degrade to a regular Join operation.</p> |
| </li> |
| </ol></div></article><div class="flex items-center text-sm lg:text-base justify-end lg:col mt-10"><a href="https://github.com/apache/doris-website/issues/new?title=Issue on docs&body=Path:false" target=_blank rel="noopener noreferrer" class="lg:mr-6 footerBtn_e3I8"><svg width=20 height=20 viewBox="0 0 20 20" fill=none><path d="M9.48038 2.9C9.71132 2.5 10.2887 2.5 10.5196 2.9L18.1406 16.1C18.3716 16.5 18.0829 17 17.621 17H2.37898C1.9171 17 1.62842 16.5 1.85936 16.1L9.48038 2.9Z" stroke=currentColor stroke-width=1.2 stroke-linecap=round /><path d="M10.5699 7.9516C10.5874 7.5628 10.2769 7.23804 9.88766 7.23804C9.49847 7.23804 9.18796 7.5628 9.20543 7.9516L9.41597 12.6385C9.42731 12.8908 9.63513 13.0895 9.88766 13.0895C10.1402 13.0895 10.348 12.8908 10.3593 12.6385L10.5699 7.9516ZM9.89338 13.7638C9.65338 13.7638 9.44766 13.8323 9.28766 13.9923C9.12766 14.1409 9.04766 14.3352 9.04766 14.5752C9.04766 14.8152 9.12766 15.0095 9.28766 15.1695C9.45909 15.318 9.6648 15.398 9.89338 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href=#what-is-join class="table-of-contents__link toc-highlight">What is JOIN</a><li><a href=#join-types-supported-by-doris class="table-of-contents__link toc-highlight">JOIN types supported by Doris</a><li><a href=#implementation-of-join-in-doris class="table-of-contents__link toc-highlight">Implementation of JOIN in Doris</a><ul><li><a href=#implementation-of-hash-join-in-doris class="table-of-contents__link toc-highlight">Implementation of Hash Join in Doris</a><li><a href=#partition-shuffle-join class="table-of-contents__link toc-highlight">Partition Shuffle Join</a><li><a href=#bucket-shuffle-join class="table-of-contents__link toc-highlight">Bucket Shuffle Join</a><li><a href=#colocate-join class="table-of-contents__link toc-highlight">Colocate Join</a></ul><li><a href=#bucket-shuffle-join-vs-colocate-join class="table-of-contents__link toc-highlight">Bucket Shuffle Join VS Colocate Join</a><ul><li><a href=#example-of-bucket-shuffle-join class="table-of-contents__link 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