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[FLINK-3943] [table] Add support for EXCEPT operator
This closes apache#2169.
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134 changes: 134 additions & 0 deletions
134
...ink-table/src/main/scala/org/apache/flink/api/table/plan/nodes/dataset/DataSetMinus.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| /* | ||
| * 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.plan.nodes.dataset | ||
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| import org.apache.calcite.plan.{RelOptCluster, RelOptCost, RelOptPlanner, RelTraitSet} | ||
| import org.apache.calcite.rel.`type`.RelDataType | ||
| import org.apache.calcite.rel.metadata.RelMetadataQuery | ||
| import org.apache.calcite.rel.{BiRel, RelNode, RelWriter} | ||
| import org.apache.flink.api.common.typeinfo.TypeInformation | ||
| import org.apache.flink.api.java.DataSet | ||
| import org.apache.flink.api.table.BatchTableEnvironment | ||
| import org.apache.flink.api.table.runtime.MinusCoGroupFunction | ||
| import org.apache.flink.api.table.typeutils.TypeConverter._ | ||
|
|
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| import scala.collection.JavaConversions._ | ||
| import scala.collection.JavaConverters._ | ||
|
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| /** | ||
| * Flink RelNode which implements set minus operation. | ||
| * | ||
| */ | ||
| class DataSetMinus( | ||
| cluster: RelOptCluster, | ||
| traitSet: RelTraitSet, | ||
| left: RelNode, | ||
| right: RelNode, | ||
| rowType: RelDataType, | ||
| all: Boolean) | ||
| extends BiRel(cluster, traitSet, left, right) | ||
| with DataSetRel { | ||
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| override def deriveRowType() = rowType | ||
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| override def copy(traitSet: RelTraitSet, inputs: java.util.List[RelNode]): RelNode = { | ||
| new DataSetMinus( | ||
| cluster, | ||
| traitSet, | ||
| inputs.get(0), | ||
| inputs.get(1), | ||
| rowType, | ||
| all | ||
| ) | ||
| } | ||
|
|
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| override def toString: String = { | ||
| s"Minus(minus: ($minusSelectionToString}))" | ||
| } | ||
|
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| override def explainTerms(pw: RelWriter): RelWriter = { | ||
| super.explainTerms(pw).item("minus", minusSelectionToString) | ||
| } | ||
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| override def computeSelfCost (planner: RelOptPlanner, metadata: RelMetadataQuery): RelOptCost = { | ||
| val children = this.getInputs | ||
| children.foldLeft(planner.getCostFactory.makeCost(0, 0, 0)) { (cost, child) => | ||
| val rowCnt = metadata.getRowCount(child) | ||
| val rowSize = this.estimateRowSize(child.getRowType) | ||
| cost.plus(planner.getCostFactory.makeCost(rowCnt, rowCnt, rowCnt * rowSize)) | ||
| } | ||
| } | ||
|
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| override def translateToPlan( | ||
| tableEnv: BatchTableEnvironment, | ||
| expectedType: Option[TypeInformation[Any]]): DataSet[Any] = { | ||
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| val leftDataSet: DataSet[Any] = left.asInstanceOf[DataSetRel].translateToPlan(tableEnv) | ||
| val rightDataSet: DataSet[Any] = right.asInstanceOf[DataSetRel].translateToPlan(tableEnv) | ||
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| val coGroupedDs = leftDataSet.coGroup(rightDataSet) | ||
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| val coGroupOpName = s"minus: ($minusSelectionToString)" | ||
| val coGroupFunction = new MinusCoGroupFunction[Any](all) | ||
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| val minusDs = coGroupedDs.where("*").equalTo("*") | ||
| .`with`(coGroupFunction).name(coGroupOpName) | ||
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| val config = tableEnv.getConfig | ||
| val leftType = leftDataSet.getType | ||
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| // here we only care about left type information, because we emit records from left DataSet | ||
| expectedType match { | ||
| case None if config.getEfficientTypeUsage => | ||
| minusDs | ||
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| case _ => | ||
| val determinedType = determineReturnType( | ||
| getRowType, | ||
| expectedType, | ||
| config.getNullCheck, | ||
| config.getEfficientTypeUsage) | ||
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| // conversion | ||
| if (determinedType != leftType) { | ||
| val mapFunc = getConversionMapper( | ||
| config, | ||
| false, | ||
| leftType, | ||
| determinedType, | ||
| "DataSetMinusConversion", | ||
| getRowType.getFieldNames) | ||
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| val opName = s"convert: (${rowType.getFieldNames.asScala.toList.mkString(", ")})" | ||
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| minusDs.map(mapFunc).name(opName) | ||
| } | ||
| // no conversion necessary, forward | ||
| else { | ||
| minusDs | ||
| } | ||
| } | ||
| } | ||
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| private def minusSelectionToString: String = { | ||
| rowType.getFieldNames.asScala.toList.mkString(", ") | ||
| } | ||
|
|
||
| } | ||
|
|
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56 changes: 56 additions & 0 deletions
56
...table/src/main/scala/org/apache/flink/api/table/plan/rules/dataSet/DataSetMinusRule.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| /* | ||
| * 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.plan.rules.dataSet | ||
|
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| import org.apache.calcite.plan.{Convention, RelOptRule, RelOptRuleCall, RelTraitSet} | ||
| import org.apache.calcite.rel.RelNode | ||
| import org.apache.calcite.rel.convert.ConverterRule | ||
| import org.apache.calcite.rel.logical.LogicalMinus | ||
| import org.apache.calcite.rel.rules.UnionToDistinctRule | ||
| import org.apache.flink.api.table.plan.nodes.dataset.{DataSetConvention, DataSetMinus} | ||
|
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| class DataSetMinusRule | ||
| extends ConverterRule( | ||
| classOf[LogicalMinus], | ||
| Convention.NONE, | ||
| DataSetConvention.INSTANCE, | ||
| "DataSetMinusRule") | ||
| { | ||
|
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| def convert(rel: RelNode): RelNode = { | ||
|
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| val minus: LogicalMinus = rel.asInstanceOf[LogicalMinus] | ||
| val traitSet: RelTraitSet = rel.getTraitSet.replace(DataSetConvention.INSTANCE) | ||
| val convLeft: RelNode = RelOptRule.convert(minus.getInput(0), DataSetConvention.INSTANCE) | ||
| val convRight: RelNode = RelOptRule.convert(minus.getInput(1), DataSetConvention.INSTANCE) | ||
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| new DataSetMinus( | ||
| rel.getCluster, | ||
| traitSet, | ||
| convLeft, | ||
| convRight, | ||
| rel.getRowType, | ||
| minus.all) | ||
| } | ||
| } | ||
|
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| object DataSetMinusRule { | ||
| val INSTANCE: RelOptRule = new DataSetMinusRule | ||
| } | ||
|
|
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