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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.iceberg</a></div> |
| <h2 title="Class Partitioning" class="title">Class Partitioning</h2> |
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| <pre>public class <span class="typeNameLabel">Partitioning</span> |
| extends java.lang.Object</pre> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>static <a href="types/Types.StructType.html" title="class in org.apache.iceberg.types">Types.StructType</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#groupingKeyType(java.util.Collection)">groupingKeyType</a></span>​(java.util.Collection<<a href="PartitionSpec.html" title="class in org.apache.iceberg">PartitionSpec</a>> specs)</code></th> |
| <td class="colLast"> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> |
| <div class="deprecationComment">use <a href="#groupingKeyType(org.apache.iceberg.Schema,java.util.Collection)"><code>groupingKeyType(Schema, Collection)</code></a> instead; will be removed in 1.3.0</div> |
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| <td class="colFirst"><code>static <a href="types/Types.StructType.html" title="class in org.apache.iceberg.types">Types.StructType</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#groupingKeyType(org.apache.iceberg.Schema,java.util.Collection)">groupingKeyType</a></span>​(<a href="Schema.html" title="class in org.apache.iceberg">Schema</a> schema, |
| java.util.Collection<<a href="PartitionSpec.html" title="class in org.apache.iceberg">PartitionSpec</a>> specs)</code></th> |
| <td class="colLast"> |
| <div class="block">Builds a grouping key type considering the provided schema and specs.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#hasBucketField(org.apache.iceberg.PartitionSpec)">hasBucketField</a></span>​(<a href="PartitionSpec.html" title="class in org.apache.iceberg">PartitionSpec</a> spec)</code></th> |
| <td class="colLast"> |
| <div class="block">Check whether the spec contains a bucketed partition field.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static <a href="types/Types.StructType.html" title="class in org.apache.iceberg.types">Types.StructType</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#partitionType(org.apache.iceberg.Table)">partitionType</a></span>​(<a href="Table.html" title="interface in org.apache.iceberg">Table</a> table)</code></th> |
| <td class="colLast"> |
| <div class="block">Builds a unified partition type considering all specs in a table.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static <a href="SortOrder.html" title="class in org.apache.iceberg">SortOrder</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#sortOrderFor(org.apache.iceberg.PartitionSpec)">sortOrderFor</a></span>​(<a href="PartitionSpec.html" title="class in org.apache.iceberg">PartitionSpec</a> spec)</code></th> |
| <td class="colLast"> |
| <div class="block">Create a sort order that will group data for a partition spec.</div> |
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| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> |
| </ul> |
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| <h3>Method Detail</h3> |
| <a id="hasBucketField(org.apache.iceberg.PartitionSpec)"> |
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| <h4>hasBucketField</h4> |
| <pre class="methodSignature">public static boolean hasBucketField​(<a href="PartitionSpec.html" title="class in org.apache.iceberg">PartitionSpec</a> spec)</pre> |
| <div class="block">Check whether the spec contains a bucketed partition field.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>spec</code> - a partition spec</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if the spec has field with a bucket transform</dd> |
| </dl> |
| </li> |
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| <h4>sortOrderFor</h4> |
| <pre class="methodSignature">public static <a href="SortOrder.html" title="class in org.apache.iceberg">SortOrder</a> sortOrderFor​(<a href="PartitionSpec.html" title="class in org.apache.iceberg">PartitionSpec</a> spec)</pre> |
| <div class="block">Create a sort order that will group data for a partition spec. |
| |
| <p>If the partition spec contains bucket columns, the sort order will also have a field to sort |
| by a column that is bucketed in the spec. The column is selected by the highest number of |
| buckets in the transform.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>spec</code> - a partition spec</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a sort order that will cluster data for the spec</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>groupingKeyType</h4> |
| <pre class="methodSignature">@Deprecated |
| public static <a href="types/Types.StructType.html" title="class in org.apache.iceberg.types">Types.StructType</a> groupingKeyType​(java.util.Collection<<a href="PartitionSpec.html" title="class in org.apache.iceberg">PartitionSpec</a>> specs)</pre> |
| <div class="deprecationBlock"><span class="deprecatedLabel">Deprecated.</span> |
| <div class="deprecationComment">use <a href="#groupingKeyType(org.apache.iceberg.Schema,java.util.Collection)"><code>groupingKeyType(Schema, Collection)</code></a> instead; will be removed in 1.3.0</div> |
| </div> |
| <div class="block">Builds a grouping key type considering all provided specs.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>specs</code> - one or many specs</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the constructed grouping key type</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="groupingKeyType(org.apache.iceberg.Schema,java.util.Collection)"> |
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| <h4>groupingKeyType</h4> |
| <pre class="methodSignature">public static <a href="types/Types.StructType.html" title="class in org.apache.iceberg.types">Types.StructType</a> groupingKeyType​(<a href="Schema.html" title="class in org.apache.iceberg">Schema</a> schema, |
| java.util.Collection<<a href="PartitionSpec.html" title="class in org.apache.iceberg">PartitionSpec</a>> specs)</pre> |
| <div class="block">Builds a grouping key type considering the provided schema and specs. |
| |
| <p>A grouping key defines how data is split between files and consists of partition fields with |
| non-void transforms that are present in each provided spec. Iceberg guarantees that records |
| with different values for the grouping key are disjoint and are stored in separate files. |
| |
| <p>If there is only one spec, the grouping key will include all partition fields with non-void |
| transforms from that spec. Whenever there are multiple specs, the grouping key will represent |
| an intersection of all partition fields with non-void transforms. If a partition field is |
| present only in a subset of specs, Iceberg cannot guarantee data distribution on that field. |
| That's why it will not be part of the grouping key. Unpartitioned tables or tables with |
| non-overlapping specs have empty grouping keys. |
| |
| <p>When partition fields are dropped in v1 tables, they are replaced with new partition fields |
| that have the same field ID but use a void transform under the hood. Such fields cannot be part |
| of the grouping key as void transforms always return null. |
| |
| <p>If the provided schema is not null, this method will only take into account partition fields |
| on top of columns present in the schema. Otherwise, all partition fields will be considered.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>schema</code> - a schema specifying a set of source columns to consider (null to consider all)</dd> |
| <dd><code>specs</code> - one or many specs</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the constructed grouping key type</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="partitionType(org.apache.iceberg.Table)"> |
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| <h4>partitionType</h4> |
| <pre class="methodSignature">public static <a href="types/Types.StructType.html" title="class in org.apache.iceberg.types">Types.StructType</a> partitionType​(<a href="Table.html" title="interface in org.apache.iceberg">Table</a> table)</pre> |
| <div class="block">Builds a unified partition type considering all specs in a table. |
| |
| <p>If there is only one spec, the partition type is that spec's partition type. Whenever there |
| are multiple specs, the partition type is a struct containing all fields that have ever been a |
| part of any spec in the table. In other words, the struct fields represent a union of all known |
| partition fields.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>table</code> - a table with one or many specs</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the constructed unified partition type</dd> |
| </dl> |
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