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ESQL: Implement 'right' function (#98974)
Add the 'right' function, which extracts a substring beginning from its right end (opposite function of 'left'). --------- Co-authored-by: Alexander Spies <alexander.spies@elastic.co>
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,5 @@ | ||
| pr: 98974 | ||
| summary: "ESQL: RIGHT function" | ||
| area: ES|QL | ||
| type: feature | ||
| issues: [] |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,19 @@ | ||
| [[esql-right]] | ||
| === `RIGHT` | ||
| [.text-center] | ||
| image::esql/functions/signature/right.svg[Embedded,opts=inline] | ||
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| Return the substring that extracts 'length' chars from the 'string' starting from the right. | ||
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| [source.merge.styled,esql] | ||
| ---- | ||
| include::{esql-specs}/string.csv-spec[tag=right] | ||
| ---- | ||
| [%header.monospaced.styled,format=dsv,separator=|] | ||
| |=== | ||
| include::{esql-specs}/string.csv-spec[tag=right-result] | ||
| |=== | ||
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| Supported types: | ||
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| include::types/right.asciidoc[] |
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| Original file line number | Diff line number | Diff line change |
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| @@ -1,5 +1,5 @@ | ||
| [%header.monospaced.styled,format=dsv,separator=|] | ||
| |=== | ||
| arg1 | arg2 | result | ||
| string | length | result | ||
| keyword | integer | keyword | ||
| |=== |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,5 @@ | ||
| [%header.monospaced.styled,format=dsv,separator=|] | ||
| |=== | ||
| string | length | result | ||
| keyword | integer | keyword | ||
| |=== |
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93 changes: 93 additions & 0 deletions
93
...erated/org/elasticsearch/xpack/esql/expression/function/scalar/string/RightEvaluator.java
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| // Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one | ||
| // or more contributor license agreements. Licensed under the Elastic License | ||
| // 2.0; you may not use this file except in compliance with the Elastic License | ||
| // 2.0. | ||
| package org.elasticsearch.xpack.esql.expression.function.scalar.string; | ||
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| import java.lang.Override; | ||
| import java.lang.String; | ||
| import org.apache.lucene.util.BytesRef; | ||
| import org.apache.lucene.util.UnicodeUtil; | ||
| import org.elasticsearch.compute.data.Block; | ||
| import org.elasticsearch.compute.data.BytesRefBlock; | ||
| import org.elasticsearch.compute.data.BytesRefVector; | ||
| import org.elasticsearch.compute.data.IntBlock; | ||
| import org.elasticsearch.compute.data.IntVector; | ||
| import org.elasticsearch.compute.data.Page; | ||
| import org.elasticsearch.compute.operator.EvalOperator; | ||
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| /** | ||
| * {@link EvalOperator.ExpressionEvaluator} implementation for {@link Right}. | ||
| * This class is generated. Do not edit it. | ||
| */ | ||
| public final class RightEvaluator implements EvalOperator.ExpressionEvaluator { | ||
| private final BytesRef out; | ||
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| private final UnicodeUtil.UTF8CodePoint cp; | ||
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| private final EvalOperator.ExpressionEvaluator str; | ||
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| private final EvalOperator.ExpressionEvaluator length; | ||
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| public RightEvaluator(BytesRef out, UnicodeUtil.UTF8CodePoint cp, | ||
| EvalOperator.ExpressionEvaluator str, EvalOperator.ExpressionEvaluator length) { | ||
| this.out = out; | ||
| this.cp = cp; | ||
| this.str = str; | ||
| this.length = length; | ||
| } | ||
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| @Override | ||
| public Block eval(Page page) { | ||
| Block strUncastBlock = str.eval(page); | ||
| if (strUncastBlock.areAllValuesNull()) { | ||
| return Block.constantNullBlock(page.getPositionCount()); | ||
| } | ||
| BytesRefBlock strBlock = (BytesRefBlock) strUncastBlock; | ||
| Block lengthUncastBlock = length.eval(page); | ||
| if (lengthUncastBlock.areAllValuesNull()) { | ||
| return Block.constantNullBlock(page.getPositionCount()); | ||
| } | ||
| IntBlock lengthBlock = (IntBlock) lengthUncastBlock; | ||
| BytesRefVector strVector = strBlock.asVector(); | ||
| if (strVector == null) { | ||
| return eval(page.getPositionCount(), strBlock, lengthBlock); | ||
| } | ||
| IntVector lengthVector = lengthBlock.asVector(); | ||
| if (lengthVector == null) { | ||
| return eval(page.getPositionCount(), strBlock, lengthBlock); | ||
| } | ||
| return eval(page.getPositionCount(), strVector, lengthVector).asBlock(); | ||
| } | ||
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| public BytesRefBlock eval(int positionCount, BytesRefBlock strBlock, IntBlock lengthBlock) { | ||
| BytesRefBlock.Builder result = BytesRefBlock.newBlockBuilder(positionCount); | ||
| BytesRef strScratch = new BytesRef(); | ||
| position: for (int p = 0; p < positionCount; p++) { | ||
| if (strBlock.isNull(p) || strBlock.getValueCount(p) != 1) { | ||
| result.appendNull(); | ||
| continue position; | ||
| } | ||
| if (lengthBlock.isNull(p) || lengthBlock.getValueCount(p) != 1) { | ||
| result.appendNull(); | ||
| continue position; | ||
| } | ||
| result.appendBytesRef(Right.process(out, cp, strBlock.getBytesRef(strBlock.getFirstValueIndex(p), strScratch), lengthBlock.getInt(lengthBlock.getFirstValueIndex(p)))); | ||
| } | ||
| return result.build(); | ||
| } | ||
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| public BytesRefVector eval(int positionCount, BytesRefVector strVector, IntVector lengthVector) { | ||
| BytesRefVector.Builder result = BytesRefVector.newVectorBuilder(positionCount); | ||
| BytesRef strScratch = new BytesRef(); | ||
| position: for (int p = 0; p < positionCount; p++) { | ||
| result.appendBytesRef(Right.process(out, cp, strVector.getBytesRef(p, strScratch), lengthVector.getInt(p))); | ||
| } | ||
| return result.build(); | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return "RightEvaluator[" + "str=" + str + ", length=" + length + "]"; | ||
| } | ||
| } |
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