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| <li>Summary: </li> |
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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.iceberg.transforms</a></div> |
| <h2 title="Interface Transform" class="title">Interface Transform<S,​T></h2> |
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| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>S</code> - Java class of source values</dd> |
| <dd><code>T</code> - Java class of transformed values</dd> |
| </dl> |
| <dl> |
| <dt>All Superinterfaces:</dt> |
| <dd><code>java.io.Serializable</code></dd> |
| </dl> |
| <dl> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><code><a href="Days.html" title="class in org.apache.iceberg.transforms">Days</a></code>, <code><a href="Hours.html" title="class in org.apache.iceberg.transforms">Hours</a></code>, <code><a href="Months.html" title="class in org.apache.iceberg.transforms">Months</a></code>, <code><a href="UnknownTransform.html" title="class in org.apache.iceberg.transforms">UnknownTransform</a></code></dd> |
| </dl> |
| <hr> |
| <pre>public interface <span class="typeNameLabel">Transform<S,​T></span> |
| extends java.io.Serializable</pre> |
| <div class="block">A transform function used for partitioning. |
| |
| <p>Implementations of this interface can be used to transform values, check or types, and project |
| <a href="../expressions/BoundPredicate.html" title="class in org.apache.iceberg.expressions"><code>predicates</code></a> to predicates on partition values.</div> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span><span id="t5" class="tableTab"><span><a href="javascript:show(16);">Default Methods</a></span><span class="tabEnd"> </span></span><span id="t6" class="tableTab"><span><a href="javascript:show(32);">Deprecated Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Method</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>default <a href="Transform.html" title="type parameter in Transform">T</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#apply(S)">apply</a></span>​(<a href="Transform.html" title="type parameter in Transform">S</a> value)</code></th> |
| <td class="colLast"> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> |
| <div class="deprecationComment">use <a href="#bind(org.apache.iceberg.types.Type)"><code>bind(Type)</code></a> instead; will be removed in 2.0.0</div> |
| </div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>default <a href="../util/SerializableFunction.html" title="interface in org.apache.iceberg.util">SerializableFunction</a><<a href="Transform.html" title="type parameter in Transform">S</a>,​<a href="Transform.html" title="type parameter in Transform">T</a>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#bind(org.apache.iceberg.types.Type)">bind</a></span>​(<a href="../types/Type.html" title="interface in org.apache.iceberg.types">Type</a> type)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns a function that applies this transform to values of the given <a href="../types/Type.html" title="interface in org.apache.iceberg.types"><code>type</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#canTransform(org.apache.iceberg.types.Type)">canTransform</a></span>​(<a href="../types/Type.html" title="interface in org.apache.iceberg.types">Type</a> type)</code></th> |
| <td class="colLast"> |
| <div class="block">Checks whether this function can be applied to the given <a href="../types/Type.html" title="interface in org.apache.iceberg.types"><code>Type</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>default java.lang.String</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#dedupName()">dedupName</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Return the unique transform name to check if similar transforms for the same source field are |
| added multiple times in partition spec builder.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code><a href="../types/Type.html" title="interface in org.apache.iceberg.types">Type</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getResultType(org.apache.iceberg.types.Type)">getResultType</a></span>​(<a href="../types/Type.html" title="interface in org.apache.iceberg.types">Type</a> sourceType)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the <a href="../types/Type.html" title="interface in org.apache.iceberg.types"><code>Type</code></a> produced by this transform given a source type.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>default boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isIdentity()">isIdentity</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Return whether this transform is the identity transform.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>default boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isVoid()">isVoid</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Return whether this transform is the void transform.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>default boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#preservesOrder()">preservesOrder</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Whether the transform preserves the order of values (is monotonic).</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code><a href="../expressions/UnboundPredicate.html" title="class in org.apache.iceberg.expressions">UnboundPredicate</a><<a href="Transform.html" title="type parameter in Transform">T</a>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#project(java.lang.String,org.apache.iceberg.expressions.BoundPredicate)">project</a></span>​(java.lang.String name, |
| <a href="../expressions/BoundPredicate.html" title="class in org.apache.iceberg.expressions">BoundPredicate</a><<a href="Transform.html" title="type parameter in Transform">S</a>> predicate)</code></th> |
| <td class="colLast"> |
| <div class="block">Transforms a <a href="../expressions/BoundPredicate.html" title="class in org.apache.iceberg.expressions"><code>predicate</code></a> to an inclusive predicate on the partition values |
| produced by the transform.</div> |
| </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code><a href="../expressions/UnboundPredicate.html" title="class in org.apache.iceberg.expressions">UnboundPredicate</a><<a href="Transform.html" title="type parameter in Transform">T</a>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#projectStrict(java.lang.String,org.apache.iceberg.expressions.BoundPredicate)">projectStrict</a></span>​(java.lang.String name, |
| <a href="../expressions/BoundPredicate.html" title="class in org.apache.iceberg.expressions">BoundPredicate</a><<a href="Transform.html" title="type parameter in Transform">S</a>> predicate)</code></th> |
| <td class="colLast"> |
| <div class="block">Transforms a <a href="../expressions/BoundPredicate.html" title="class in org.apache.iceberg.expressions"><code>predicate</code></a> to a strict predicate on the partition values |
| produced by the transform.</div> |
| </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code>default boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#satisfiesOrderOf(org.apache.iceberg.transforms.Transform)">satisfiesOrderOf</a></span>​(<a href="Transform.html" title="interface in org.apache.iceberg.transforms">Transform</a><?,​?> other)</code></th> |
| <td class="colLast"> |
| <div class="block">Whether ordering by this transform's result satisfies the ordering of another transform's |
| result.</div> |
| </td> |
| </tr> |
| <tr id="i11" class="rowColor"> |
| <td class="colFirst"><code>default java.lang.String</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toHumanString(org.apache.iceberg.types.Type,T)">toHumanString</a></span>​(<a href="../types/Type.html" title="interface in org.apache.iceberg.types">Type</a> type, |
| <a href="Transform.html" title="type parameter in Transform">T</a> value)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i12" class="altColor"> |
| <td class="colFirst"><code>default java.lang.String</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toHumanString(T)">toHumanString</a></span>​(<a href="Transform.html" title="type parameter in Transform">T</a> value)</code></th> |
| <td class="colLast"> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> |
| <div class="deprecationComment">use <a href="#toHumanString(org.apache.iceberg.types.Type,T)"><code>toHumanString(Type, Object)</code></a> instead; will be removed in 2.0.0</div> |
| </div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ METHOD DETAIL ========== --> |
| <section role="region"> |
| <ul class="blockList"> |
| <li class="blockList"><a id="method.detail"> |
| <!-- --> |
| </a> |
| <h3>Method Detail</h3> |
| <a id="apply(java.lang.Object)"> |
| <!-- --> |
| </a><a id="apply(S)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>apply</h4> |
| <pre class="methodSignature">@Deprecated |
| default <a href="Transform.html" title="type parameter in Transform">T</a> apply​(<a href="Transform.html" title="type parameter in Transform">S</a> value)</pre> |
| <div class="deprecationBlock"><span class="deprecatedLabel">Deprecated.</span> |
| <div class="deprecationComment">use <a href="#bind(org.apache.iceberg.types.Type)"><code>bind(Type)</code></a> instead; will be removed in 2.0.0</div> |
| </div> |
| <div class="block">Transforms a value to its corresponding partition value.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>value</code> - a source value</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a transformed partition value</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="bind(org.apache.iceberg.types.Type)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>bind</h4> |
| <pre class="methodSignature">default <a href="../util/SerializableFunction.html" title="interface in org.apache.iceberg.util">SerializableFunction</a><<a href="Transform.html" title="type parameter in Transform">S</a>,​<a href="Transform.html" title="type parameter in Transform">T</a>> bind​(<a href="../types/Type.html" title="interface in org.apache.iceberg.types">Type</a> type)</pre> |
| <div class="block">Returns a function that applies this transform to values of the given <a href="../types/Type.html" title="interface in org.apache.iceberg.types"><code>type</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>type</code> - an Iceberg <a href="../types/Type.html" title="interface in org.apache.iceberg.types"><code>Type</code></a></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a <code>Function</code> that applies this transform to values of the given type.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="canTransform(org.apache.iceberg.types.Type)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>canTransform</h4> |
| <pre class="methodSignature">boolean canTransform​(<a href="../types/Type.html" title="interface in org.apache.iceberg.types">Type</a> type)</pre> |
| <div class="block">Checks whether this function can be applied to the given <a href="../types/Type.html" title="interface in org.apache.iceberg.types"><code>Type</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>type</code> - a type</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if this transform can be applied to the type, false otherwise</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="getResultType(org.apache.iceberg.types.Type)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getResultType</h4> |
| <pre class="methodSignature"><a href="../types/Type.html" title="interface in org.apache.iceberg.types">Type</a> getResultType​(<a href="../types/Type.html" title="interface in org.apache.iceberg.types">Type</a> sourceType)</pre> |
| <div class="block">Returns the <a href="../types/Type.html" title="interface in org.apache.iceberg.types"><code>Type</code></a> produced by this transform given a source type.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>sourceType</code> - a type</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the result type created by the apply method for the given type</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="preservesOrder()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>preservesOrder</h4> |
| <pre class="methodSignature">default boolean preservesOrder()</pre> |
| <div class="block">Whether the transform preserves the order of values (is monotonic). |
| |
| <p>A transform preserves order for values when for any given a and b, if a < b then apply(a) |
| <= apply(b).</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if the transform preserves the order of values</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="satisfiesOrderOf(org.apache.iceberg.transforms.Transform)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>satisfiesOrderOf</h4> |
| <pre class="methodSignature">default boolean satisfiesOrderOf​(<a href="Transform.html" title="interface in org.apache.iceberg.transforms">Transform</a><?,​?> other)</pre> |
| <div class="block">Whether ordering by this transform's result satisfies the ordering of another transform's |
| result. |
| |
| <p>For example, sorting by day(ts) will produce an ordering that is also by month(ts) or |
| year(ts). However, sorting by day(ts) will not satisfy the order of hour(ts) or identity(ts).</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if ordering by this transform is equivalent to ordering by the other transform</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="project(java.lang.String,org.apache.iceberg.expressions.BoundPredicate)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>project</h4> |
| <pre class="methodSignature"><a href="../expressions/UnboundPredicate.html" title="class in org.apache.iceberg.expressions">UnboundPredicate</a><<a href="Transform.html" title="type parameter in Transform">T</a>> project​(java.lang.String name, |
| <a href="../expressions/BoundPredicate.html" title="class in org.apache.iceberg.expressions">BoundPredicate</a><<a href="Transform.html" title="type parameter in Transform">S</a>> predicate)</pre> |
| <div class="block">Transforms a <a href="../expressions/BoundPredicate.html" title="class in org.apache.iceberg.expressions"><code>predicate</code></a> to an inclusive predicate on the partition values |
| produced by the transform. |
| |
| <p>This inclusive transform guarantees that if pred(v) is true, then projected(apply(v)) is |
| true.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>name</code> - the field name for partition values</dd> |
| <dd><code>predicate</code> - a predicate for source values</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an inclusive predicate on partition values</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="projectStrict(java.lang.String,org.apache.iceberg.expressions.BoundPredicate)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>projectStrict</h4> |
| <pre class="methodSignature"><a href="../expressions/UnboundPredicate.html" title="class in org.apache.iceberg.expressions">UnboundPredicate</a><<a href="Transform.html" title="type parameter in Transform">T</a>> projectStrict​(java.lang.String name, |
| <a href="../expressions/BoundPredicate.html" title="class in org.apache.iceberg.expressions">BoundPredicate</a><<a href="Transform.html" title="type parameter in Transform">S</a>> predicate)</pre> |
| <div class="block">Transforms a <a href="../expressions/BoundPredicate.html" title="class in org.apache.iceberg.expressions"><code>predicate</code></a> to a strict predicate on the partition values |
| produced by the transform. |
| |
| <p>This strict transform guarantees that if strict(apply(v)) is true, then pred(v) is also |
| true.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>name</code> - the field name for partition values</dd> |
| <dd><code>predicate</code> - a predicate for source values</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an inclusive predicate on partition values</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="isIdentity()"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>isIdentity</h4> |
| <pre class="methodSignature">default boolean isIdentity()</pre> |
| <div class="block">Return whether this transform is the identity transform.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if this is an identity transform, false otherwise</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="isVoid()"> |
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| <li class="blockList"> |
| <h4>isVoid</h4> |
| <pre class="methodSignature">default boolean isVoid()</pre> |
| <div class="block">Return whether this transform is the void transform.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if this is a void transform, false otherwise</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="toHumanString(java.lang.Object)"> |
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| </a><a id="toHumanString(T)"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>toHumanString</h4> |
| <pre class="methodSignature">@Deprecated |
| default java.lang.String toHumanString​(<a href="Transform.html" title="type parameter in Transform">T</a> value)</pre> |
| <div class="deprecationBlock"><span class="deprecatedLabel">Deprecated.</span> |
| <div class="deprecationComment">use <a href="#toHumanString(org.apache.iceberg.types.Type,T)"><code>toHumanString(Type, Object)</code></a> instead; will be removed in 2.0.0</div> |
| </div> |
| <div class="block">Returns a human-readable String representation of a transformed value. |
| |
| <p>null values will return "null"</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>value</code> - a transformed value</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a human-readable String representation of the value</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="toHumanString(org.apache.iceberg.types.Type,java.lang.Object)"> |
| <!-- --> |
| </a><a id="toHumanString(org.apache.iceberg.types.Type,T)"> |
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| <h4>toHumanString</h4> |
| <pre class="methodSignature">default java.lang.String toHumanString​(<a href="../types/Type.html" title="interface in org.apache.iceberg.types">Type</a> type, |
| <a href="Transform.html" title="type parameter in Transform">T</a> value)</pre> |
| </li> |
| </ul> |
| <a id="dedupName()"> |
| <!-- --> |
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| <h4>dedupName</h4> |
| <pre class="methodSignature">default java.lang.String dedupName()</pre> |
| <div class="block">Return the unique transform name to check if similar transforms for the same source field are |
| added multiple times in partition spec builder.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a name used for dedup</dd> |
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