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[FLINK-4825] [table] Implement a RexExecutor that uses Flink's code g…
…eneration. This closes apache#2884 This closes apache#2874 (closing PR with Public API breaking changes)
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117 changes: 117 additions & 0 deletions
117
...ies/flink-table/src/main/scala/org/apache/flink/api/table/codegen/ExpressionReducer.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. | ||
| */ | ||
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| package org.apache.flink.api.table.codegen | ||
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| import java.util | ||
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| import org.apache.calcite.plan.RelOptPlanner | ||
| import org.apache.calcite.rex.{RexBuilder, RexNode} | ||
| import org.apache.calcite.sql.`type`.SqlTypeName | ||
| import org.apache.flink.api.common.functions.MapFunction | ||
| import org.apache.flink.api.common.typeinfo.{BasicTypeInfo, TypeInformation} | ||
| import org.apache.flink.api.table.typeutils.{RowTypeInfo, TypeConverter} | ||
| import org.apache.flink.api.table.{FlinkTypeFactory, Row, TableConfig} | ||
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| import scala.collection.JavaConverters._ | ||
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| /** | ||
| * Evaluates constant expressions using Flink's [[CodeGenerator]]. | ||
| */ | ||
| class ExpressionReducer(config: TableConfig) | ||
| extends RelOptPlanner.Executor with Compiler[MapFunction[Row, Row]] { | ||
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| private val EMPTY_ROW_INFO = TypeConverter.DEFAULT_ROW_TYPE | ||
| private val EMPTY_ROW = new Row(0) | ||
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| override def reduce( | ||
| rexBuilder: RexBuilder, | ||
| constExprs: util.List[RexNode], | ||
| reducedValues: util.List[RexNode]): Unit = { | ||
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| val typeFactory = rexBuilder.getTypeFactory.asInstanceOf[FlinkTypeFactory] | ||
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| val literals = constExprs.asScala.map(e => (e.getType.getSqlTypeName, e)).flatMap { | ||
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| // we need to cast here for RexBuilder.makeLiteral | ||
| case (SqlTypeName.DATE, e) => | ||
| Some( | ||
| rexBuilder.makeCast(typeFactory.createTypeFromTypeInfo(BasicTypeInfo.INT_TYPE_INFO), e) | ||
| ) | ||
| case (SqlTypeName.TIME, e) => | ||
| Some( | ||
| rexBuilder.makeCast(typeFactory.createTypeFromTypeInfo(BasicTypeInfo.INT_TYPE_INFO), e) | ||
| ) | ||
| case (SqlTypeName.TIMESTAMP, e) => | ||
| Some( | ||
| rexBuilder.makeCast(typeFactory.createTypeFromTypeInfo(BasicTypeInfo.LONG_TYPE_INFO), e) | ||
| ) | ||
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| // we don't support object literals yet, we skip those constant expressions | ||
| case (SqlTypeName.ANY, _) | (SqlTypeName.ROW, _) => None | ||
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| case (_, e) => Some(e) | ||
| } | ||
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| val literalTypes = literals.map(e => FlinkTypeFactory.toTypeInfo(e.getType)) | ||
| val resultType = new RowTypeInfo(literalTypes) | ||
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| // generate MapFunction | ||
| val generator = new CodeGenerator(config, false, EMPTY_ROW_INFO) | ||
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| val result = generator.generateResultExpression( | ||
| resultType, | ||
| resultType.getFieldNames, | ||
| literals) | ||
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| val generatedFunction = generator.generateFunction[MapFunction[Row, Row]]( | ||
| "ExpressionReducer", | ||
| classOf[MapFunction[Row, Row]], | ||
| s""" | ||
| |${result.code} | ||
| |return ${result.resultTerm}; | ||
| |""".stripMargin, | ||
| resultType.asInstanceOf[TypeInformation[Any]]) | ||
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| val clazz = compile(getClass.getClassLoader, generatedFunction.name, generatedFunction.code) | ||
| val function = clazz.newInstance() | ||
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| // execute | ||
| val reduced = function.map(EMPTY_ROW) | ||
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| // add the reduced results or keep them unreduced | ||
| var i = 0 | ||
| var reducedIdx = 0 | ||
| while (i < constExprs.size()) { | ||
| val unreduced = constExprs.get(i) | ||
| unreduced.getType.getSqlTypeName match { | ||
| // we insert the original expression for object literals | ||
| case SqlTypeName.ANY | SqlTypeName.ROW => | ||
| reducedValues.add(unreduced) | ||
| case _ => | ||
| val literal = rexBuilder.makeLiteral( | ||
| reduced.productElement(reducedIdx), | ||
| unreduced.getType, | ||
| true) | ||
| reducedValues.add(literal) | ||
| reducedIdx += 1 | ||
| } | ||
| i += 1 | ||
| } | ||
| } | ||
| } |
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