Github user fhueske commented on a diff in the pull request: https://github.com/apache/flink/pull/3715#discussion_r116794639 --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/join/JoinUtil.scala --- @@ -0,0 +1,468 @@ +/* + * 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.runtime.join + +import java.math.{BigDecimal => JBigDecimal} +import java.util +import java.util.EnumSet + +import org.apache.calcite.avatica.util.TimeUnit +import org.apache.calcite.rel.`type`.RelDataType +import org.apache.calcite.rel.core.JoinRelType +import org.apache.calcite.rex._ +import org.apache.calcite.sql.fun.SqlStdOperatorTable +import org.apache.calcite.sql.parser.SqlParserPos +import org.apache.calcite.sql.{SqlIntervalQualifier, SqlKind} +import org.apache.flink.api.common.functions.{FilterFunction, FlatJoinFunction} +import org.apache.flink.api.common.typeinfo.{BasicTypeInfo, TypeInformation} +import org.apache.flink.table.api.{TableConfig, TableException} +import org.apache.flink.table.calcite.FlinkTypeFactory +import org.apache.flink.table.codegen.{CodeGenException, CodeGenerator, ExpressionReducer} +import org.apache.flink.table.plan.nodes.logical.FlinkLogicalJoin +import org.apache.flink.table.plan.schema.RowSchema +import org.apache.flink.types.Row + +import scala.collection.JavaConversions._ +import scala.collection.mutable.ArrayBuffer + + +object JoinUtil { + + /** + * Analyze time-condtion to get time boundary for each stream and get the time type + * and return condition without time-condition. + * + * @param condition other condtion include time-condition + * @param leftFieldCount left stream fields count + * @param inputType left and right connect stream type + * @param rexBuilder util to build rexNode + * @param config table environment config + */ + private[flink] def analyzeTimeBoundary( + condition: RexNode, + leftLogicalFieldCnt: Int, + leftPhysicalFieldCnt: Int, + inputType: RelDataType, + rexBuilder: RexBuilder, + config: TableConfig): (RelDataType, Long, Long, RexNode) = { + // analyze the time-conditon to get greate and less condition, + // make sure left stream field in the left of the condition + // e.g b.proctime > a.proctime - 1 will be translate to a.proctime - 1 < b.proctime + val greateConditions = new util.ArrayList[TimeSingleCondition]() + val lessConditions = new util.ArrayList[TimeSingleCondition]() + analyzeTimeCondition(condition, greateConditions, + lessConditions, leftLogicalFieldCnt, inputType) + if (greateConditions.size != lessConditions.size + || greateConditions.size > 1 + || greateConditions.size == 0) { + throw TableException( + "Equality join time conditon should have proctime or rowtime indicator." + ) + } + + val greatCond = greateConditions.get(0) + val lessCond = lessConditions.get(0) + if (greatCond.timeType != lessCond.timeType) { + throw TableException( + "Equality join time conditon should all use proctime or all use rowtime." + ) + } + + var leftStreamWindowSize: Long = 0 + var rightStreamWindowSize: Long = 0 + + // only a.proctime > b.proctime - interval '1' hour need to store a stream + val timeLiteral: RexLiteral = + reduceTimeExpression(greatCond.rightExpr, greatCond.leftExpr, rexBuilder, config) + leftStreamWindowSize = timeLiteral.getValue2.asInstanceOf[Long] + // only need to store past records + if (leftStreamWindowSize < 0) { + leftStreamWindowSize = -leftStreamWindowSize + if (!greatCond.isEqual) { + leftStreamWindowSize -= 1 + } + } else { + leftStreamWindowSize = 0 + } + + // only a.proctime < b.proctime + interval '1' hour need to store b stream + val timeLiteral2: RexLiteral = + reduceTimeExpression(lessCond.leftExpr, lessCond.rightExpr, rexBuilder, config) + rightStreamWindowSize = timeLiteral2.getValue2.asInstanceOf[Long] + // only need to store past records + if (rightStreamWindowSize < 0) { + rightStreamWindowSize = -rightStreamWindowSize + if (!lessCond.isEqual) { + rightStreamWindowSize -= 1 + } + } else { + rightStreamWindowSize = 0 + } + + // get condition without time-condition + // e.g a.price > b.price and a.proctime between b.proctime and b.proctime + interval '1' hour + // will return a.price > b.price and true and true + var conditionWithoutTime = removeTimeCondition( + condition, + greatCond.originCall, + lessCond.originCall, + rexBuilder, + leftLogicalFieldCnt, + leftPhysicalFieldCnt) + + // reduce the expression + // true and ture => true, otherwise keep the origin expression + try { + val exprReducer = new ExpressionReducer(config) + val originList = new util.ArrayList[RexNode]() + originList.add(conditionWithoutTime) + val reduceList = new util.ArrayList[RexNode]() + exprReducer.reduce(rexBuilder, originList, reduceList) + conditionWithoutTime = reduceList.get(0) + } catch { + case _ : CodeGenException => // ignore + } + + (greatCond.timeType, leftStreamWindowSize, rightStreamWindowSize, conditionWithoutTime) + } + + /** + * Generate other non-equi condition function + * @param config table env config + * @param joinType join type to determain whether input can be null + * @param leftType left stream type + * @param rightType right stream type + * @param returnType return type + * @param otherCondition non-equi condition + * @param ruleDescription rule description + */ + private[flink] def generateJoinFunction( + config: TableConfig, + joinType: JoinRelType, + leftType: TypeInformation[Row], + rightType: TypeInformation[Row], + returnType: RowSchema, + otherCondition: RexNode, + ruleDescription: String) = { + + // whether input can be null + val nullCheck = joinType match { + case JoinRelType.INNER => false + case JoinRelType.LEFT => true + case JoinRelType.RIGHT => true + case JoinRelType.FULL => true + } + + // generate other non-equi function code + val generator = new CodeGenerator( + config, + nullCheck, + leftType, + Some(rightType)) + + val conversion = generator.generateConverterResultExpression( + returnType.physicalTypeInfo, + returnType.physicalType.getFieldNames) + + // if other condition is literal(true), then output the result directly + val body = if (otherCondition.isAlwaysTrue) { + s""" + |${conversion.code} + |${generator.collectorTerm}.collect(${conversion.resultTerm}); + |""".stripMargin + } + else { + val condition = generator.generateExpression(otherCondition) + s""" + |${condition.code} + |if (${condition.resultTerm}) { + | ${conversion.code} + | ${generator.collectorTerm}.collect(${conversion.resultTerm}); + |} + |""".stripMargin + } + + val genFunction = generator.generateFunction( + ruleDescription, + classOf[FlatJoinFunction[Row, Row, Row]], + body, + returnType.physicalTypeInfo) + + genFunction + } + + private case class TimeSingleCondition( + timeType: RelDataType, + leftExpr: RexNode, + rightExpr: RexNode, + isEqual: Boolean, + originCall: RexNode) + + val COMPARISON: util.Set[SqlKind] = EnumSet.of( + SqlKind.LESS_THAN, + SqlKind.GREATER_THAN, + SqlKind.GREATER_THAN_OR_EQUAL, + SqlKind.LESS_THAN_OR_EQUAL) + + val EQUI_COMPARISON: util.Set[SqlKind] = EnumSet.of( + SqlKind.GREATER_THAN_OR_EQUAL, + SqlKind.LESS_THAN_OR_EQUAL) + + val LESS_COMPARISON: util.Set[SqlKind] = EnumSet.of( + SqlKind.LESS_THAN, + SqlKind.LESS_THAN_OR_EQUAL) + + val GREAT_COMPARISON: util.Set[SqlKind] = EnumSet.of( + SqlKind.GREATER_THAN, + SqlKind.GREATER_THAN_OR_EQUAL) + + /** + * Analyze time-conditon to divide all time-condition into great and less condition + */ + private def analyzeTimeCondition( + condition: RexNode, --- End diff -- please indent the arguments by two more spaces and add a new line to make the signature better distinguishable from the body:+ ``` private def analyzeTimeCondition( condition: RexNode, greatCondition: util.List[TimeSingleCondition], lessCondition: util.List[TimeSingleCondition], leftFieldCount: Int, inputType: RelDataType): Unit = { if (condition.isInstanceOf[RexCall]) { ... ```
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