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fill-rule="evenodd" d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"></path></svg></span>info</div><div class="admonitionContent_S0QG"><p> This page describes SQL-based batch ingestion using the <a href="/docs/28.0.1/multi-stage-query/"><code>druid-multi-stage-query</code></a> |
| extension, new in Druid 24.0. Refer to the <a href="/docs/28.0.1/ingestion/#batch">ingestion methods</a> table to determine which |
| ingestion method is right for you.</p></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="multi-stage-query-task-runtime">Multi-stage query task runtime<a href="#multi-stage-query-task-runtime" class="hash-link" aria-label="Direct link to Multi-stage query task runtime" title="Direct link to Multi-stage query task runtime"></a></h2><ul><li><p>Fault tolerance is partially implemented. Workers get relaunched when they are killed unexpectedly. The controller does not get relaunched if it is killed unexpectedly.</p></li><li><p>Worker task stage outputs are stored in the working directory given by <code>druid.indexer.task.baseDir</code>. Stages that |
| generate a large amount of output data may exhaust all available disk space. In this case, the query fails with |
| an <a href="/docs/28.0.1/multi-stage-query/reference#error_UnknownError">UnknownError</a> with a message including "No space left on device".</p></li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="select-statement"><code>SELECT</code> Statement<a href="#select-statement" class="hash-link" aria-label="Direct link to select-statement" title="Direct link to select-statement"></a></h2><ul><li><p><code>GROUPING SETS</code> are not implemented. Queries using these features return a |
| <a href="/docs/28.0.1/multi-stage-query/reference#error_QueryNotSupported">QueryNotSupported</a> error.</p></li><li><p>The numeric varieties of the <code>EARLIEST</code> and <code>LATEST</code> aggregators do not work properly. Attempting to use the numeric |
| varieties of these aggregators lead to an error like |
| <code>java.lang.ClassCastException: class java.lang.Double cannot be cast to class org.apache.druid.collections.SerializablePair</code>. |
| The string varieties, however, do work properly.</p></li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="insert-and-replace-statements"><code>INSERT</code> and <code>REPLACE</code> Statements<a href="#insert-and-replace-statements" class="hash-link" aria-label="Direct link to insert-and-replace-statements" title="Direct link to insert-and-replace-statements"></a></h2><ul><li><p>The <code>INSERT</code> and <code>REPLACE</code> statements with column lists, like <code>INSERT INTO tbl (a, b, c) SELECT ...</code>, is not implemented.</p></li><li><p><code>INSERT ... SELECT</code> and <code>REPLACE ... SELECT</code> insert columns from the <code>SELECT</code> statement based on column name. This |
| differs from SQL standard behavior, where columns are inserted based on position.</p></li><li><p><code>INSERT</code> and <code>REPLACE</code> do not support all options available in <a href="/docs/28.0.1/ingestion/ingestion-spec">ingestion specs</a>, |
| including the <code>createBitmapIndex</code> and <code>multiValueHandling</code> <a href="/docs/28.0.1/ingestion/ingestion-spec#dimension-objects">dimension</a> |
| properties, and the <code>indexSpec</code> <a href="/docs/28.0.1/ingestion/ingestion-spec#tuningconfig"><code>tuningConfig</code></a> property.</p></li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="extern-function"><code>EXTERN</code> Function<a href="#extern-function" class="hash-link" aria-label="Direct link to extern-function" title="Direct link to extern-function"></a></h2><ul><li><p>The <a href="/docs/28.0.1/ingestion/ingestion-spec#inclusions-and-exclusions">schemaless dimensions</a> |
| feature is not available. All columns and their types must be specified explicitly using the <code>signature</code> parameter |
| of the <a href="/docs/28.0.1/multi-stage-query/reference#extern-function"><code>EXTERN</code> function</a>.</p></li><li><p><code>EXTERN</code> with input sources that match large numbers of files may exhaust available memory on the controller task.</p></li><li><p><code>EXTERN</code> refers to external files. Use <code>FROM</code> to access <code>druid</code> input sources.</p></li></ul></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/28.0.1/multi-stage-query/reference"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Reference</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/28.0.1/development/extensions-core/kafka-ingestion"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Apache Kafka ingestion</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#multi-stage-query-task-runtime" class="table-of-contents__link toc-highlight">Multi-stage query task runtime</a></li><li><a href="#select-statement" class="table-of-contents__link toc-highlight"><code>SELECT</code> Statement</a></li><li><a href="#insert-and-replace-statements" class="table-of-contents__link toc-highlight"><code>INSERT</code> and <code>REPLACE</code> Statements</a></li><li><a href="#extern-function" class="table-of-contents__link toc-highlight"><code>EXTERN</code> Function</a></li></ul></div></div></div></div></main></div></div><footer class="footer"><div class="container container-fluid"><div class="footer__bottom text--center"><div class="margin-bottom--sm"><img src="/img/favicon.png" class="themedImage_ToTc themedImage--light_HNdA footer__logo"><img src="/img/favicon.png" class="themedImage_ToTc themedImage--dark_i4oU footer__logo"></div><div class="footer__copyright">Copyright © 2023 Apache Software Foundation. Except where otherwise noted, licensed under CC BY-SA 4.0. Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></div></footer></div> |
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