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[FLINK-9714][table] Support versioned joins with processing time
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...pache/flink/table/plan/nodes/datastream/DataStreamTemporalJoinToCoProcessTranslator.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://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.table.plan.nodes.datastream | ||
|
|
||
| import org.apache.calcite.rel.core.{JoinInfo, JoinRelType} | ||
| import org.apache.calcite.rex._ | ||
| import org.apache.flink.api.common.functions.FlatJoinFunction | ||
| import org.apache.flink.api.common.typeinfo.TypeInformation | ||
| import org.apache.flink.streaming.api.functions.co.CoProcessFunction | ||
| import org.apache.flink.table.api.{StreamQueryConfig, TableConfig, TableException, ValidationException} | ||
| import org.apache.flink.table.calcite.FlinkTypeFactory._ | ||
| import org.apache.flink.table.codegen.GeneratedFunction | ||
| import org.apache.flink.table.plan.logical.rel.LogicalTemporalTableJoin | ||
| import org.apache.flink.table.plan.logical.rel.LogicalTemporalTableJoin._ | ||
| import org.apache.flink.table.plan.schema.RowSchema | ||
| import org.apache.flink.table.plan.util.RexDefaultVisitor | ||
| import org.apache.flink.table.runtime.join.TemporalJoin | ||
| import org.apache.flink.table.runtime.types.CRow | ||
| import org.apache.flink.types.Row | ||
| import org.apache.flink.util.Preconditions.checkState | ||
|
|
||
| class DataStreamTemporalJoinToCoProcessTranslator private ( | ||
| textualRepresentation: String, | ||
| config: TableConfig, | ||
| returnType: TypeInformation[Row], | ||
| leftSchema: RowSchema, | ||
| rightSchema: RowSchema, | ||
| joinInfo: JoinInfo, | ||
| rexBuilder: RexBuilder, | ||
| leftTimeAttribute: RexNode, | ||
| rightTimeAttribute: Option[RexNode], | ||
| rightPrimaryKeyExpression: RexNode, | ||
| remainingNonEquiJoinPredicates: RexNode) | ||
| extends DataStreamJoinToCoProcessTranslator( | ||
| config, | ||
| returnType, | ||
| leftSchema, | ||
| rightSchema, | ||
| joinInfo, | ||
| rexBuilder) { | ||
|
|
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| override val nonEquiJoinPredicates: Option[RexNode] = Some(remainingNonEquiJoinPredicates) | ||
|
|
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| override protected def createCoProcessFunction( | ||
| joinType: JoinRelType, | ||
| queryConfig: StreamQueryConfig, | ||
| joinFunction: GeneratedFunction[FlatJoinFunction[Row, Row, Row], Row]) | ||
| : CoProcessFunction[CRow, CRow, CRow] = { | ||
|
|
||
| if (rightTimeAttribute.isDefined) { | ||
| throw new ValidationException( | ||
| s"Currently only proctime temporal joins are supported in [$textualRepresentation]") | ||
| } | ||
|
|
||
| joinType match { | ||
| case JoinRelType.INNER => | ||
| new TemporalJoin( | ||
| leftSchema.typeInfo, | ||
| rightSchema.typeInfo, | ||
| joinFunction.name, | ||
| joinFunction.code, | ||
| queryConfig) | ||
| case _ => | ||
| throw new ValidationException( | ||
| s"Only ${JoinRelType.INNER} temporal join is supported in [$textualRepresentation]") | ||
| } | ||
| } | ||
| } | ||
|
|
||
| object DataStreamTemporalJoinToCoProcessTranslator { | ||
| def create( | ||
| textualRepresentation: String, | ||
| config: TableConfig, | ||
| returnType: TypeInformation[Row], | ||
| leftSchema: RowSchema, | ||
| rightSchema: RowSchema, | ||
| joinInfo: JoinInfo, | ||
| rexBuilder: RexBuilder): DataStreamTemporalJoinToCoProcessTranslator = { | ||
|
|
||
| checkState( | ||
| !joinInfo.isEqui, | ||
| "Missing %s in join condition", | ||
| TEMPORAL_JOIN_CONDITION) | ||
|
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| val nonEquiJoinRex: RexNode = joinInfo.getRemaining(rexBuilder) | ||
| val temporalJoinConditionExtractor = new TemporalJoinConditionExtractor( | ||
| textualRepresentation, | ||
| leftSchema.typeInfo.getTotalFields, | ||
| joinInfo, | ||
| rexBuilder) | ||
|
|
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| val remainingNonEquiJoinPredicates = temporalJoinConditionExtractor.apply(nonEquiJoinRex) | ||
|
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| checkState( | ||
| temporalJoinConditionExtractor.leftTimeAttribute.isDefined && | ||
| temporalJoinConditionExtractor.rightPrimaryKeyExpression.isDefined, | ||
| "Missing %s in join condition", | ||
| TEMPORAL_JOIN_CONDITION) | ||
|
|
||
| new DataStreamTemporalJoinToCoProcessTranslator( | ||
| textualRepresentation, | ||
| config, | ||
| returnType, | ||
| leftSchema, | ||
| rightSchema, | ||
| joinInfo, | ||
| rexBuilder, | ||
| temporalJoinConditionExtractor.leftTimeAttribute.get, | ||
| temporalJoinConditionExtractor.rightTimeAttribute, | ||
| temporalJoinConditionExtractor.rightPrimaryKeyExpression.get, | ||
| remainingNonEquiJoinPredicates) | ||
| } | ||
|
|
||
| private class TemporalJoinConditionExtractor( | ||
| textualRepresentation: String, | ||
| rightKeysStartingOffset: Int, | ||
| joinInfo: JoinInfo, | ||
| rexBuilder: RexBuilder) | ||
|
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| extends RexShuttle { | ||
|
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| var leftTimeAttribute: Option[RexNode] = None | ||
|
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| var rightTimeAttribute: Option[RexNode] = None | ||
|
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| var rightPrimaryKeyExpression: Option[RexNode] = None | ||
|
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| override def visitCall(call: RexCall): RexNode = { | ||
| if (call.getOperator != TEMPORAL_JOIN_CONDITION) { | ||
| return super.visitCall(call) | ||
| } | ||
|
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||
| checkState( | ||
| leftTimeAttribute.isEmpty | ||
| && rightPrimaryKeyExpression.isEmpty | ||
| && rightTimeAttribute.isEmpty, | ||
| "Multiple %s functions in [%s]", | ||
| TEMPORAL_JOIN_CONDITION, | ||
| textualRepresentation) | ||
|
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||
| if (LogicalTemporalTableJoin.isRowtimeCall(call)) { | ||
| leftTimeAttribute = Some(call.getOperands.get(0)) | ||
| rightTimeAttribute = Some(call.getOperands.get(1)) | ||
|
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| rightPrimaryKeyExpression = Some(validateRightPrimaryKey(call.getOperands.get(2))) | ||
|
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| if (!isRowtimeIndicatorType(rightTimeAttribute.get.getType)) { | ||
| throw new ValidationException( | ||
| s"Non rowtime timeAttribute [${rightTimeAttribute.get.getType}] " + | ||
| s"used to create TemporalTableFunction") | ||
| } | ||
| if (!isRowtimeIndicatorType(leftTimeAttribute.get.getType)) { | ||
| throw new ValidationException( | ||
| s"Non rowtime timeAttribute [${leftTimeAttribute.get.getType}] " + | ||
| s"passed as the argument to TemporalTableFunction") | ||
| } | ||
|
|
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| throw new TableException("Event time temporal joins are not yet supported.") | ||
| } | ||
| else if (LogicalTemporalTableJoin.isProctimeCall(call)) { | ||
| leftTimeAttribute = Some(call.getOperands.get(0)) | ||
| rightPrimaryKeyExpression = Some(validateRightPrimaryKey(call.getOperands.get(1))) | ||
|
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| if (!isProctimeIndicatorType(leftTimeAttribute.get.getType)) { | ||
| throw new ValidationException( | ||
| s"Non processing timeAttribute [${leftTimeAttribute.get.getType}] " + | ||
| s"passed as the argument to TemporalTableFunction") | ||
| } | ||
| } | ||
| else { | ||
| throw new IllegalStateException( | ||
| s"Unsupported invocation $call in [$textualRepresentation]") | ||
| } | ||
| rexBuilder.makeLiteral(true) | ||
| } | ||
|
|
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| private def validateRightPrimaryKey(rightPrimaryKey: RexNode): RexNode = { | ||
| if (joinInfo.rightKeys.size() != 1) { | ||
| throw new ValidationException( | ||
| s"Only single column join key is supported. " + | ||
| s"Found ${joinInfo.rightKeys} in [$textualRepresentation]") | ||
| } | ||
| val rightKey = joinInfo.rightKeys.get(0) + rightKeysStartingOffset | ||
|
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| val primaryKeyVisitor = new PrimaryKeyVisitor(textualRepresentation) | ||
| rightPrimaryKey.accept(primaryKeyVisitor) | ||
|
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| primaryKeyVisitor.inputReference match { | ||
| case None => | ||
| throw new IllegalStateException( | ||
| s"Failed to find primary key reference in [$textualRepresentation]") | ||
| case Some(primaryKeyInputReference) if primaryKeyInputReference != rightKey => | ||
| throw new ValidationException( | ||
| s"Join key [$rightKey] must be the same as " + | ||
| s"temporal table's primary key [$primaryKeyInputReference] " + | ||
| s"in [$textualRepresentation]") | ||
| case _ => | ||
| rightPrimaryKey | ||
| } | ||
| } | ||
| } | ||
|
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| /** | ||
| * Extracts input references from primary key expression. | ||
| */ | ||
| private class PrimaryKeyVisitor(textualRepresentation: String) | ||
| extends RexDefaultVisitor[RexNode] { | ||
|
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| var inputReference: Option[Int] = None | ||
|
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| override def visitInputRef(inputRef: RexInputRef): RexNode = { | ||
| inputReference = Some(inputRef.getIndex) | ||
| inputRef | ||
| } | ||
|
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| override def visitNode(rexNode: RexNode): RexNode = { | ||
| throw new ValidationException( | ||
| s"Unsupported right primary key expression [$rexNode] in [$textualRepresentation]") | ||
| } | ||
| } | ||
| } |
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