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[Enhancement]Rewrite unnest(bitmap_to_array) to unnest_bitmap (#52870)
Signed-off-by: before-Sunrise <[email protected]>
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...rc/main/java/com/starrocks/sql/optimizer/rule/transformation/RewriteUnnestBitmapRule.java
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|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| // Copyright 2021-present StarRocks, Inc. All rights reserved. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // https://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| package com.starrocks.sql.optimizer.rule.transformation; | ||
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| import com.google.common.collect.Lists; | ||
| import com.starrocks.analysis.Expr; | ||
| import com.starrocks.catalog.Function; | ||
| import com.starrocks.catalog.FunctionSet; | ||
| import com.starrocks.catalog.TableFunction; | ||
| import com.starrocks.catalog.Type; | ||
| import com.starrocks.common.Pair; | ||
| import com.starrocks.sql.optimizer.OptExpression; | ||
| import com.starrocks.sql.optimizer.OptimizerContext; | ||
| import com.starrocks.sql.optimizer.operator.OperatorType; | ||
| import com.starrocks.sql.optimizer.operator.logical.LogicalProjectOperator; | ||
| import com.starrocks.sql.optimizer.operator.logical.LogicalTableFunctionOperator; | ||
| import com.starrocks.sql.optimizer.operator.pattern.Pattern; | ||
| import com.starrocks.sql.optimizer.operator.scalar.CallOperator; | ||
| import com.starrocks.sql.optimizer.operator.scalar.ColumnRefOperator; | ||
| import com.starrocks.sql.optimizer.operator.scalar.ScalarOperator; | ||
| import com.starrocks.sql.optimizer.rule.RuleType; | ||
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| import java.util.List; | ||
| import java.util.Map; | ||
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| public class RewriteUnnestBitmapRule extends TransformationRule { | ||
| private static final RewriteUnnestBitmapRule INSTANCE = new RewriteUnnestBitmapRule(); | ||
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| private RewriteUnnestBitmapRule() { | ||
| super(RuleType.TF_REWRITE_UNNEST_BITMAP_RULE, Pattern.create(OperatorType.LOGICAL_TABLE_FUNCTION) | ||
| .addChildren(Pattern.create(OperatorType.LOGICAL_PROJECT))); | ||
| } | ||
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| public static RewriteUnnestBitmapRule getInstance() { | ||
| return INSTANCE; | ||
| } | ||
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| @Override | ||
| public boolean check(OptExpression input, OptimizerContext context) { | ||
| if (!context.getSessionVariable().isEnableRewriteUnnestBitmapToArray()) { | ||
| return false; | ||
| } | ||
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| LogicalTableFunctionOperator tableFunctionOperator = (LogicalTableFunctionOperator) input.getOp(); | ||
| if (tableFunctionOperator.getFn() != null && | ||
| !tableFunctionOperator.getFn().functionName().equals(FunctionSet.UNNEST)) { | ||
| return false; | ||
| } | ||
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| LogicalProjectOperator projectOperator = (LogicalProjectOperator) input.inputAt(0).getOp(); | ||
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| boolean existBitmapToArray = projectOperator.getColumnRefMap().values().stream().filter(scalarOperator -> { | ||
| if (scalarOperator instanceof CallOperator) { | ||
| CallOperator callOperator = (CallOperator) scalarOperator; | ||
| return callOperator.getFnName().equals(FunctionSet.BITMAP_TO_ARRAY); | ||
| } | ||
| return false; | ||
| }).count() == 1; | ||
|
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| return existBitmapToArray; | ||
| } | ||
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| @Override | ||
| public List<OptExpression> transform(OptExpression input, OptimizerContext context) { | ||
| LogicalTableFunctionOperator originalTableFunctionOperator = (LogicalTableFunctionOperator) input.getOp(); | ||
| LogicalProjectOperator projectOperator = (LogicalProjectOperator) input.inputAt(0).getOp(); | ||
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| Map<ColumnRefOperator, ScalarOperator> columnRefMap = projectOperator.getColumnRefMap(); | ||
| Pair<ColumnRefOperator, ScalarOperator> bitmapToArray = columnRefMap.entrySet().stream().filter(entry -> { | ||
| if (entry.getValue() instanceof CallOperator) { | ||
| CallOperator callOperator = (CallOperator) entry.getValue(); | ||
| return callOperator.getFnName().equals(FunctionSet.BITMAP_TO_ARRAY); | ||
| } | ||
| return false; | ||
| }).map(entry -> new Pair<>(entry.getKey(), entry.getValue())).findFirst().get(); | ||
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| // if bitmap_to_array's output will be used by upper nodes, it's not safe to rewrite | ||
| if (originalTableFunctionOperator.getOuterColRefs().contains(bitmapToArray.first)) { | ||
| return Lists.newArrayList(); | ||
| } | ||
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| ColumnRefOperator bitmapColumn = bitmapToArray.second.getColumnRefs().get(0); | ||
| columnRefMap.remove(bitmapToArray.first); | ||
| columnRefMap.putIfAbsent(bitmapColumn, bitmapColumn); | ||
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| TableFunction unnestBitmapFn = | ||
| (TableFunction) Expr.getBuiltinFunction(FunctionSet.UNNEST_BITMAP, new Type[] {Type.BITMAP}, | ||
| Function.CompareMode.IS_NONSTRICT_SUPERTYPE_OF); | ||
| List<Pair<ColumnRefOperator, ScalarOperator>> fnParamColumnProject = | ||
| Lists.newArrayList(Pair.create(bitmapColumn, bitmapColumn)); | ||
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| LogicalTableFunctionOperator newTableFunctionOperator = | ||
| new LogicalTableFunctionOperator(originalTableFunctionOperator.getFnResultColRefs(), unnestBitmapFn, | ||
| fnParamColumnProject, originalTableFunctionOperator.getOuterColRefs()); | ||
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| return Lists.newArrayList(OptExpression.create(newTableFunctionOperator, input.inputAt(0))); | ||
| } | ||
| } | ||
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