Github user hongyuhong commented on a diff in the pull request: https://github.com/apache/flink/pull/3715#discussion_r125205215 --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/join/JoinUtil.scala --- @@ -0,0 +1,385 @@ +/* + * 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 org.apache.calcite.plan.RelOptUtil +import org.apache.calcite.rel.`type`.RelDataType +import org.apache.calcite.rel.core.JoinRelType +import org.apache.calcite.rex._ +import org.apache.calcite.sql.SqlKind +import org.apache.calcite.sql.fun.{SqlFloorFunction, SqlStdOperatorTable} +import org.apache.flink.api.common.functions.FlatJoinFunction +import org.apache.flink.api.common.typeinfo.TypeInformation +import org.apache.flink.table.api.{TableConfig, TableException} +import org.apache.flink.table.calcite.FlinkTypeFactory +import org.apache.flink.table.codegen.{CodeGenerator, ExpressionReducer} +import org.apache.flink.table.functions.TimeMaterializationSqlFunction +import org.apache.flink.table.plan.schema.{RowSchema, TimeIndicatorRelDataType} +import org.apache.flink.types.Row + +import scala.collection.JavaConversions._ + +/** + * An util class to help analyze and build join code . + */ +object JoinUtil { + + /** + * check if the join case is stream join stream + * + * @param condition other condtion include time-condition + * @param inputType left and right connect stream type + */ + private[flink] def isStreamStreamJoin( + condition: RexNode, + inputType: RelDataType) = { + + def isExistTumble(expr: RexNode): Boolean = { + expr match { + case c: RexCall => + c.getOperator match { + case _: SqlFloorFunction => + c.getOperands.map(analyzeSingleConditionTerm(_, 0, inputType)).exists(_.size > 0) + case SqlStdOperatorTable.TUMBLE => + c.getOperands.map(analyzeSingleConditionTerm(_, 0, inputType)).exists(_.size > 0) + case _ => + c.getOperands.map(isExistTumble(_)).exists(_ == true) + } + case _ => false + } + } + + val isExistTimeIndicator = analyzeSingleConditionTerm(condition, 0, inputType).size > 0 + val isExistTumbleExpr = isExistTumble(condition) + + !isExistTumbleExpr && isExistTimeIndicator + } + + /** + * Analyze time-condtion to get time boundary for each stream and get the time type + * and return remain condition. + * + * @param condition other condtion include time-condition + * @param leftLogicalFieldCnt left stream logical field num + * @param leftPhysicalFieldCnt left stream physical field num + * @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, Option[RexNode]) = { + + // Converts the condition to conjunctive normal form (CNF) + val cnfCondition = RexUtil.toCnf(rexBuilder, condition) + + // split the condition into time indicator condition and other condition + val (timeTerms, remainTerms) = + splitJoinCondition( + cnfCondition, + leftLogicalFieldCnt, + inputType + ) + + if (timeTerms.size != 2) { + throw new TableException("There only can and must have 2 time conditions.") + } + + // extract time offset from the time indicator conditon + val streamTimeOffsets = + timeTerms.map(x => extractTimeOffsetFromCondition(x._3, x._2, rexBuilder, config)) + + val (leftTableOffset, rightTableOffset) = + streamTimeOffsets match { + case Seq((x, true), (y, false)) => (x, y) + case Seq((x, false), (y, true)) => (y, x) + case _ => + throw new TableException("Both input need time boundary.") + } + + // compose the remain condition list into one condition + val remainCondition = + remainTerms match { + case Seq() => None + case _ => + // turn the logical field index to physical field index + def transInputRef(expr: RexNode): RexNode = { + expr match { + case c: RexCall => + val newOps = c.operands.map(transInputRef(_)) + rexBuilder.makeCall(c.getType, c.getOperator, newOps) + case i: RexInputRef if i.getIndex >= leftLogicalFieldCnt => + rexBuilder.makeInputRef( + i.getType, + i.getIndex - leftLogicalFieldCnt + leftPhysicalFieldCnt) + case _ => expr + } + } + + Some(remainTerms.map(transInputRef(_)).reduceLeft( (l, r) => { + RelOptUtil.andJoinFilters(rexBuilder, l, r) + })) + } + + (timeTerms.get(0)._1, leftTableOffset, rightTableOffset, remainCondition) + } + + /** + * Split the join conditions into time condition and non-time condition + */ + private def splitJoinCondition( + cnfCondition: RexNode, + leftFieldCount: Int, + inputType: RelDataType): (Seq[(RelDataType, Boolean, RexNode)], Seq[RexNode]) = { + + cnfCondition match { + case c: RexCall if c.getKind == SqlKind.AND => + val timeIndicators = + c.operands.map(splitJoinCondition(_, leftFieldCount, inputType)) + timeIndicators.reduceLeft { (l, r) => + (l._1 ++ r._1, l._2 ++ r._2) + } + case c: RexCall => + val timeIndicators = analyzeSingleConditionTerm(c, leftFieldCount, inputType) + timeIndicators match { + case Seq() => + (Seq(), Seq(c)) + case Seq(v1, v2) => + if (v1._1 != v2._1) { + throw new TableException("The time indicators for each input should be the same.") + } + if (v1._2 == v2._2) { + throw new TableException("Both input's time indicators is needed.") + } + (Seq((v1._1, v1._2, c)), Seq()) + case _ => + throw new TableException( + "There only can and must have one time indicators for each input.") + } + case other => --- End diff -- This case is for some RexNode did not belong to RexCall such RexLiteral(true)
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