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[FLINK-3848] [table] Add ProjectableTableSource and push projections …
…into BatchTableSourceScan. This closes apache#2923.
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84 changes: 84 additions & 0 deletions
84
...g/apache/flink/api/table/plan/rules/dataSet/PushProjectIntoBatchTableSourceScanRule.scala
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you 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 | ||
| * | ||
| * http: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 org.apache.flink.api.table.plan.rules.dataSet | ||
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| import org.apache.calcite.plan.{RelOptRule, RelOptRuleCall} | ||
| import org.apache.calcite.plan.RelOptRule.{none, operand} | ||
| import org.apache.flink.api.table.plan.nodes.dataset.{BatchTableSourceScan, DataSetCalc} | ||
| import org.apache.flink.api.table.plan.rules.util.RexProgramProjectExtractor._ | ||
| import org.apache.flink.api.table.sources.{BatchTableSource, ProjectableTableSource} | ||
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| /** | ||
| * This rule tries to push projections into a BatchTableSourceScan. | ||
| */ | ||
| class PushProjectIntoBatchTableSourceScanRule extends RelOptRule( | ||
| operand(classOf[DataSetCalc], | ||
| operand(classOf[BatchTableSourceScan], none)), | ||
| "PushProjectIntoBatchTableSourceScanRule") { | ||
|
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| override def matches(call: RelOptRuleCall) = { | ||
| val scan: BatchTableSourceScan = call.rel(1).asInstanceOf[BatchTableSourceScan] | ||
| scan.tableSource match { | ||
| case _: ProjectableTableSource[_] => true | ||
| case _ => false | ||
| } | ||
| } | ||
|
|
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| override def onMatch(call: RelOptRuleCall) { | ||
| val calc: DataSetCalc = call.rel(0).asInstanceOf[DataSetCalc] | ||
| val scan: BatchTableSourceScan = call.rel(1).asInstanceOf[BatchTableSourceScan] | ||
|
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| val usedFields: Array[Int] = extractRefInputFields(calc.calcProgram) | ||
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| // if no fields can be projected, there is no need to transform subtree | ||
| if (scan.tableSource.getNumberOfFields != usedFields.length) { | ||
| val originTableSource = scan.tableSource.asInstanceOf[ProjectableTableSource[_]] | ||
| val newTableSource = originTableSource.projectFields(usedFields) | ||
| val newScan = new BatchTableSourceScan( | ||
| scan.getCluster, | ||
| scan.getTraitSet, | ||
| scan.getTable, | ||
| newTableSource.asInstanceOf[BatchTableSource[_]]) | ||
|
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| val newCalcProgram = rewriteRexProgram( | ||
| calc.calcProgram, | ||
| newScan.getRowType, | ||
| usedFields, | ||
| calc.getCluster.getRexBuilder) | ||
|
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| // if project merely returns its input and doesn't exist filter, remove datasetCalc nodes | ||
| if (newCalcProgram.isTrivial) { | ||
| call.transformTo(newScan) | ||
| } else { | ||
| val newCalc = new DataSetCalc( | ||
| calc.getCluster, | ||
| calc.getTraitSet, | ||
| newScan, | ||
| calc.getRowType, | ||
| newCalcProgram, | ||
| description) | ||
| call.transformTo(newCalc) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
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| object PushProjectIntoBatchTableSourceScanRule { | ||
| val INSTANCE: RelOptRule = new PushProjectIntoBatchTableSourceScanRule | ||
| } |
120 changes: 120 additions & 0 deletions
120
...rc/main/scala/org/apache/flink/api/table/plan/rules/util/RexProgramProjectExtractor.scala
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you 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 | ||
| * | ||
| * http: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 org.apache.flink.api.table.plan.rules.util | ||
|
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| import org.apache.calcite.rel.`type`.RelDataType | ||
| import org.apache.calcite.rex._ | ||
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| import scala.collection.JavaConversions._ | ||
| import scala.collection.mutable | ||
| import scala.collection.JavaConverters._ | ||
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| object RexProgramProjectExtractor { | ||
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| /** | ||
| * Extracts the indexes of input fields accessed by the RexProgram. | ||
| * | ||
| * @param rexProgram The RexProgram to analyze | ||
| * @return The indexes of accessed input fields | ||
| */ | ||
| def extractRefInputFields(rexProgram: RexProgram): Array[Int] = { | ||
| val visitor = new RefFieldsVisitor | ||
| // extract input fields from project expressions | ||
| rexProgram.getProjectList.foreach(exp => rexProgram.expandLocalRef(exp).accept(visitor)) | ||
| val condition = rexProgram.getCondition | ||
| // extract input fields from condition expression | ||
| if (condition != null) { | ||
| rexProgram.expandLocalRef(condition).accept(visitor) | ||
| } | ||
| visitor.getFields | ||
| } | ||
|
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| /** | ||
| * Generates a new RexProgram based on mapped input fields. | ||
| * | ||
| * @param rexProgram original RexProgram | ||
| * @param inputRowType input row type | ||
| * @param usedInputFields indexes of used input fields | ||
| * @param rexBuilder builder for Rex expressions | ||
| * | ||
| * @return A RexProgram with mapped input field expressions. | ||
| */ | ||
| def rewriteRexProgram( | ||
| rexProgram: RexProgram, | ||
| inputRowType: RelDataType, | ||
| usedInputFields: Array[Int], | ||
| rexBuilder: RexBuilder): RexProgram = { | ||
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| val inputRewriter = new InputRewriter(usedInputFields) | ||
| val newProjectExpressions = rexProgram.getProjectList.map( | ||
| exp => rexProgram.expandLocalRef(exp).accept(inputRewriter) | ||
| ).toList.asJava | ||
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| val oldCondition = rexProgram.getCondition | ||
| val newConditionExpression = { | ||
| oldCondition match { | ||
| case ref: RexLocalRef => rexProgram.expandLocalRef(ref).accept(inputRewriter) | ||
| case _ => null // null does not match any type | ||
| } | ||
| } | ||
| RexProgram.create( | ||
| inputRowType, | ||
| newProjectExpressions, | ||
| newConditionExpression, | ||
| rexProgram.getOutputRowType, | ||
| rexBuilder | ||
| ) | ||
| } | ||
| } | ||
|
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| /** | ||
| * A RexVisitor to extract used input fields | ||
| */ | ||
| class RefFieldsVisitor extends RexVisitorImpl[Unit](true) { | ||
| private var fields = mutable.LinkedHashSet[Int]() | ||
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| def getFields: Array[Int] = fields.toArray | ||
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| override def visitInputRef(inputRef: RexInputRef): Unit = fields += inputRef.getIndex | ||
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| override def visitCall(call: RexCall): Unit = | ||
| call.operands.foreach(operand => operand.accept(this)) | ||
| } | ||
|
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| /** | ||
| * A RexShuttle to rewrite field accesses of a RexProgram. | ||
| * | ||
| * @param fields fields mapping | ||
| */ | ||
| class InputRewriter(fields: Array[Int]) extends RexShuttle { | ||
|
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| /** old input fields ref index -> new input fields ref index mappings */ | ||
| private val fieldMap: Map[Int, Int] = | ||
| fields.zipWithIndex.toMap | ||
|
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| override def visitInputRef(inputRef: RexInputRef): RexNode = | ||
| new RexInputRef(relNodeIndex(inputRef), inputRef.getType) | ||
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| override def visitLocalRef(localRef: RexLocalRef): RexNode = | ||
| new RexInputRef(relNodeIndex(localRef), localRef.getType) | ||
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| private def relNodeIndex(ref: RexSlot): Int = | ||
| fieldMap.getOrElse(ref.getIndex, | ||
| throw new IllegalArgumentException("input field contains invalid index")) | ||
| } |
38 changes: 38 additions & 0 deletions
38
...link-table/src/main/scala/org/apache/flink/api/table/sources/ProjectableTableSource.scala
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,38 @@ | ||
| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you 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 | ||
| * | ||
| * http: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. | ||
| */ | ||
|
|
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| package org.apache.flink.api.table.sources | ||
|
|
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| /** | ||
| * Adds support for projection push-down to a [[TableSource]]. | ||
| * A [[TableSource]] extending this interface is able to project the fields of the return table. | ||
| * | ||
| * @tparam T The return type of the [[ProjectableTableSource]]. | ||
| */ | ||
| trait ProjectableTableSource[T] { | ||
|
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| /** | ||
| * Creates a copy of the [[ProjectableTableSource]] that projects its output on the specified | ||
| * fields. | ||
| * | ||
| * @param fields The indexes of the fields to return. | ||
| * @return A copy of the [[ProjectableTableSource]] that projects its output. | ||
| */ | ||
| def projectFields(fields: Array[Int]): ProjectableTableSource[T] | ||
|
|
||
| } |
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