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[FLINK-3735] Make DataSetUnionRule match only for union-all #1874

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[FLINK-3735] Make DataSetUnionRule match only for union-all #1874

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34 changes: 21 additions & 13 deletions ...table/src/main/scala/org/apache/flink/api/table/plan/rules/dataSet/DataSetUnionRule.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,7 @@

package org.apache.flink.api.table.plan.rules.dataSet

import org.apache.calcite.plan.{Convention, RelOptRule, RelTraitSet}
import org.apache.calcite.plan.{RelOptRuleCall, Convention, RelOptRule, RelTraitSet}
import org.apache.calcite.rel.RelNode
import org.apache.calcite.rel.convert.ConverterRule
import org.apache.calcite.rel.logical.LogicalUnion
Expand All @@ -32,21 +32,29 @@ class DataSetUnionRule
"FlinkUnionRule")
{

def convert(rel: RelNode): RelNode = {
/**
* Only translate UNION ALL
*/
override def matches(call: RelOptRuleCall): Boolean = {
val union: LogicalUnion = call.rel(0).asInstanceOf[LogicalUnion]
union.all
}

def convert(rel: RelNode): RelNode = {

val union: LogicalUnion = rel.asInstanceOf[LogicalUnion]
val traitSet: RelTraitSet = rel.getTraitSet.replace(DataSetConvention.INSTANCE)
val convLeft: RelNode = RelOptRule.convert(union.getInput(0), DataSetConvention.INSTANCE)
val convRight: RelNode = RelOptRule.convert(union.getInput(1), DataSetConvention.INSTANCE)
val union: LogicalUnion = rel.asInstanceOf[LogicalUnion]
val traitSet: RelTraitSet = rel.getTraitSet.replace(DataSetConvention.INSTANCE)
val convLeft: RelNode = RelOptRule.convert(union.getInput(0), DataSetConvention.INSTANCE)
val convRight: RelNode = RelOptRule.convert(union.getInput(1), DataSetConvention.INSTANCE)

new DataSetUnion(
rel.getCluster,
traitSet,
convLeft,
convRight,
rel.getRowType)
}
new DataSetUnion(
rel.getCluster,
traitSet,
convLeft,
convRight,
rel.getRowType)
}
}

object DataSetUnionRule {
val INSTANCE: RelOptRule = new DataSetUnionRule
Expand Down