org.apache.flink.table.planner.plan.rules.logical.CalcPythonCorrelateTransposeRule Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of flink-table-planner-blink_2.11 Show documentation
Show all versions of flink-table-planner-blink_2.11 Show documentation
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.rules.logical;
import org.apache.flink.table.planner.plan.nodes.logical.FlinkLogicalCalc;
import org.apache.flink.table.planner.plan.nodes.logical.FlinkLogicalCorrelate;
import org.apache.flink.table.planner.plan.nodes.logical.FlinkLogicalRel;
import org.apache.flink.table.planner.plan.nodes.logical.FlinkLogicalTableFunctionScan;
import org.apache.flink.table.planner.plan.rules.physical.stream.StreamPhysicalCorrelateRule;
import org.apache.flink.table.planner.plan.utils.PythonUtil;
import org.apache.calcite.plan.RelOptRule;
import org.apache.calcite.plan.RelOptRuleCall;
import org.apache.calcite.plan.RelOptUtil;
import org.apache.calcite.rel.core.JoinRelType;
import org.apache.calcite.rex.RexBuilder;
import org.apache.calcite.rex.RexNode;
import org.apache.calcite.rex.RexProgram;
import org.apache.calcite.rex.RexProgramBuilder;
import org.apache.calcite.rex.RexUtil;
import java.util.List;
import java.util.stream.Collectors;
/**
* Rule will transpose the conditions after the Python correlate node if the join type is inner
* join.
*/
public class CalcPythonCorrelateTransposeRule extends RelOptRule {
public static final CalcPythonCorrelateTransposeRule INSTANCE =
new CalcPythonCorrelateTransposeRule();
private CalcPythonCorrelateTransposeRule() {
super(
operand(
FlinkLogicalCorrelate.class,
operand(FlinkLogicalRel.class, any()),
operand(FlinkLogicalCalc.class, any())),
"CalcPythonCorrelateTransposeRule");
}
@Override
public boolean matches(RelOptRuleCall call) {
FlinkLogicalCorrelate correlate = call.rel(0);
FlinkLogicalCalc right = call.rel(2);
JoinRelType joinType = correlate.getJoinType();
FlinkLogicalCalc mergedCalc = StreamPhysicalCorrelateRule.getMergedCalc(right);
FlinkLogicalTableFunctionScan scan = StreamPhysicalCorrelateRule.getTableScan(mergedCalc);
return joinType == JoinRelType.INNER
&& PythonUtil.isPythonCall(scan.getCall(), null)
&& mergedCalc.getProgram().getCondition() != null;
}
@Override
public void onMatch(RelOptRuleCall call) {
FlinkLogicalCorrelate correlate = call.rel(0);
FlinkLogicalCalc right = call.rel(2);
RexBuilder rexBuilder = call.builder().getRexBuilder();
FlinkLogicalCalc mergedCalc = StreamPhysicalCorrelateRule.getMergedCalc(right);
FlinkLogicalTableFunctionScan tableScan =
StreamPhysicalCorrelateRule.getTableScan(mergedCalc);
RexProgram mergedCalcProgram = mergedCalc.getProgram();
InputRefRewriter inputRefRewriter =
new InputRefRewriter(
correlate.getRowType().getFieldCount()
- mergedCalc.getRowType().getFieldCount());
List correlateFilters =
RelOptUtil.conjunctions(
mergedCalcProgram.expandLocalRef(mergedCalcProgram.getCondition()))
.stream()
.map(x -> x.accept(inputRefRewriter))
.collect(Collectors.toList());
FlinkLogicalCorrelate newCorrelate =
new FlinkLogicalCorrelate(
correlate.getCluster(),
correlate.getTraitSet(),
correlate.getLeft(),
tableScan,
correlate.getCorrelationId(),
correlate.getRequiredColumns(),
correlate.getJoinType());
RexNode topCalcCondition = RexUtil.composeConjunction(rexBuilder, correlateFilters);
RexProgram rexProgram =
new RexProgramBuilder(newCorrelate.getRowType(), rexBuilder).getProgram();
FlinkLogicalCalc newTopCalc =
new FlinkLogicalCalc(
newCorrelate.getCluster(),
newCorrelate.getTraitSet(),
newCorrelate,
RexProgram.create(
newCorrelate.getRowType(),
rexProgram.getExprList(),
topCalcCondition,
newCorrelate.getRowType(),
rexBuilder));
call.transformTo(newTopCalc);
}
}