org.apache.flink.table.planner.plan.nodes.physical.common.CommonPhysicalJoin.scala Maven / Gradle / Ivy
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This module bridges Table/SQL API and runtime. It contains
all resources that are required during pre-flight and runtime
phase. The content of this module is work-in-progress. It will
replace flink-table-planner once it is stable. See FLINK-11439
and FLIP-32 for more details.
/*
* 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.planner.plan.nodes.physical.common
import org.apache.flink.table.api.TableException
import org.apache.flink.table.planner.plan.nodes.exec.spec.JoinSpec
import org.apache.flink.table.planner.plan.nodes.physical.FlinkPhysicalRel
import org.apache.flink.table.planner.plan.utils.JoinUtil
import org.apache.flink.table.planner.plan.utils.PythonUtil.containsPythonCall
import org.apache.flink.table.planner.plan.utils.RelExplainUtil.preferExpressionFormat
import org.apache.calcite.plan.{RelOptCluster, RelTraitSet}
import org.apache.calcite.rel.`type`.{RelDataType, RelDataTypeField}
import org.apache.calcite.rel.core.{CorrelationId, Join, JoinRelType}
import org.apache.calcite.rel.{RelNode, RelWriter}
import org.apache.calcite.rex.RexNode
import org.apache.calcite.sql.validate.SqlValidatorUtil
import java.util.Collections
import scala.collection.JavaConversions._
/**
* Base physical class for flink [[Join]].
*/
abstract class CommonPhysicalJoin(
cluster: RelOptCluster,
traitSet: RelTraitSet,
leftRel: RelNode,
rightRel: RelNode,
condition: RexNode,
joinType: JoinRelType)
extends Join(cluster, traitSet, Collections.emptyList(), leftRel, rightRel, condition,
Set.empty[CorrelationId], joinType)
with FlinkPhysicalRel {
if (containsPythonCall(condition)) {
throw new TableException("Only inner join condition with equality predicates supports the " +
"Python UDF taking the inputs from the left table and the right table at the same time, " +
"e.g., ON T1.id = T2.id && pythonUdf(T1.a, T2.b)")
}
lazy val joinSpec: JoinSpec = JoinUtil.createJoinSpec(this)
lazy val inputRowType: RelDataType = joinType match {
case JoinRelType.SEMI | JoinRelType.ANTI =>
// Combines inputs' RowType, the result is different from SEMI/ANTI Join's RowType.
SqlValidatorUtil.createJoinType(
getCluster.getTypeFactory,
getLeft.getRowType,
getRight.getRowType,
null,
Collections.emptyList[RelDataTypeField]
)
case _ =>
getRowType
}
override def explainTerms(pw: RelWriter): RelWriter = {
pw.input("left", getLeft).input("right", getRight)
.item("joinType", joinSpec.getJoinType.toString)
.item("where", getExpressionString(
getCondition, inputRowType.getFieldNames.toList, None, preferExpressionFormat(pw)))
.item("select", getRowType.getFieldNames.mkString(", "))
}
}