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https://issues.apache.org/jira/browse/FLINK-9713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16619322#comment-16619322
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ASF GitHub Bot commented on FLINK-9713:
---------------------------------------
pnowojski commented on a change in pull request #6299: [FLINK-9713][table][sql]
Support processing time versioned joins
URL: https://github.com/apache/flink/pull/6299#discussion_r218439267
##########
File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/rules/logical/LogicalCorrelateToTemporalTableJoinRule.scala
##########
@@ -0,0 +1,208 @@
+/*
+ * 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.plan.rules.logical
+
+import org.apache.calcite.plan.RelOptRule.{any, none, operand, some}
+import org.apache.calcite.plan.{RelOptRule, RelOptRuleCall}
+import org.apache.calcite.rel.RelNode
+import org.apache.calcite.rel.core.TableFunctionScan
+import org.apache.calcite.rel.logical.LogicalCorrelate
+import org.apache.calcite.rex._
+import org.apache.flink.table.api.{Table, Types, ValidationException}
+import org.apache.flink.table.calcite.FlinkTypeFactory.isProctimeIndicatorType
+import org.apache.flink.table.expressions._
+import org.apache.flink.table.functions.TemporalTableFunction
+import org.apache.flink.table.functions.utils.TableSqlFunction
+import org.apache.flink.table.plan.logical.rel.LogicalTemporalTableJoin
+import org.apache.flink.table.plan.util.RexDefaultVisitor
+
+class LogicalCorrelateToTemporalTableJoinRule
+ extends RelOptRule(
+ operand(classOf[LogicalCorrelate],
+ some(
+ operand(classOf[RelNode], any()),
+ operand(classOf[TableFunctionScan], none()))),
+ "LogicalCorrelateToTemporalTableJoinRule") {
+
+ def extractNameFromTimeAttribute(timeAttribute: Expression): String = {
+ timeAttribute match {
+ case RowtimeAttribute(expr: TemporalTableReference) =>
+ expr.name
+ case ProctimeAttribute(expr: TemporalTableReference) =>
+ expr.name
+ case TemporalTableReference(name, _) =>
+ name
+ case ResolvedFieldReference(name, _)
+ if timeAttribute.resultType == Types.LONG ||
+ timeAttribute.resultType == Types.SQL_TIMESTAMP =>
+ name
+ case _ => throw new ValidationException(
+ s"Invalid timeAttribute [${timeAttribute}] in TemporalTableFunction")
+ }
+ }
+
+ override def onMatch(call: RelOptRuleCall): Unit = {
+ val logicalCorrelate: LogicalCorrelate = call.rel(0)
+ val leftNode: RelNode = call.rel(1)
+ val rightTableFunctionScan: TableFunctionScan = call.rel(2)
+
+ val cluster = logicalCorrelate.getCluster
+
+ new GetTemporalTableFunctionCall(cluster.getRexBuilder, leftNode)
+ .visit(rightTableFunctionScan.getCall) match {
+ case Some(TemporalTableFunctionCall(rightTemporalTableFunction,
leftTimeAttribute)) =>
+ val underlyingHistoryTable: Table =
rightTemporalTableFunction.getUnderlyingHistoryTable
+ val relBuilder = this.relBuilderFactory.create(
+ cluster,
+ underlyingHistoryTable.relBuilder.getRelOptSchema)
+ val rexBuilder = cluster.getRexBuilder
+
+ val rightNode: RelNode =
underlyingHistoryTable.logicalPlan.toRelNode(relBuilder)
+
+ val rightTimeIndicatorExpression = createRightExpression(
+ rexBuilder,
+ leftNode,
+ rightNode,
+
extractNameFromTimeAttribute(rightTemporalTableFunction.getTimeAttribute))
+
+ val rightPrimaryKeyExpression = createRightExpression(
+ rexBuilder,
+ leftNode,
+ rightNode,
+ rightTemporalTableFunction.getPrimaryKey)
+
+ relBuilder.push(
+ if
(isProctimeIndicatorType(rightTemporalTableFunction.getTimeAttribute.resultType))
{
+ LogicalTemporalTableJoin.create(
+ rexBuilder,
+ cluster,
+ logicalCorrelate.getTraitSet,
+ leftNode,
+ rightNode,
+ leftTimeAttribute,
+ rightPrimaryKeyExpression)
+ }
+ else {
+ LogicalTemporalTableJoin.create(
+ rexBuilder,
+ cluster,
+ logicalCorrelate.getTraitSet,
+ leftNode,
+ rightNode,
+ leftTimeAttribute,
+ rightTimeIndicatorExpression,
+ rightPrimaryKeyExpression)
+ })
+ call.transformTo(relBuilder.build())
+ case None =>
+ }
+ }
+
+ private def createRightExpression(
+ rexBuilder: RexBuilder,
+ leftNode: RelNode,
+ rightNode: RelNode,
+ field: String): RexNode = {
+ val rightReferencesOffset = leftNode.getRowType.getFieldCount
+ val rightDataTypeField = rightNode.getRowType.getField(field, false, false)
+ rexBuilder.makeInputRef(
+ rightDataTypeField.getType, rightReferencesOffset +
rightDataTypeField.getIndex)
+ }
+}
+
+object LogicalCorrelateToTemporalTableJoinRule {
+ val INSTANCE: RelOptRule = new LogicalCorrelateToTemporalTableJoinRule
+}
+
+/**
+ * Simple pojo class for extracted [[TemporalTableFunction]] with time
attribute
+ * extracted from RexNode with [[TemporalTableFunction]] call.
+ */
+case class TemporalTableFunctionCall(
+ var temporalTableFunction: TemporalTableFunction,
+ var timeAttribute: RexNode) {
+}
+
+/**
+ * Find [[TemporalTableFunction]] call and run
[[CorrelatedFieldAccessRemoval]] on it's operand.
+ */
+class GetTemporalTableFunctionCall(
+ var rexBuilder: RexBuilder,
+ var leftSide: RelNode)
+ extends RexVisitorImpl[TemporalTableFunctionCall](false) {
+
+ def visit(node: RexNode): Option[TemporalTableFunctionCall] = {
+ val result = node.accept(this)
+ if (result == null) {
+ return None
+ }
+ Some(result)
+ }
+
+ override def visitCall(rexCall: RexCall): TemporalTableFunctionCall = {
+ if (!rexCall.getOperator.isInstanceOf[TableSqlFunction]) {
+ return null
Review comment:
I wanted to, but `null` is enforced by `RexVisitorImpl` :( So we are stuck
with it unless we want to replace it with our own version.
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> Support versioned joins in planning phase
> -----------------------------------------
>
> Key: FLINK-9713
> URL: https://issues.apache.org/jira/browse/FLINK-9713
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Affects Versions: 1.5.0
> Reporter: Piotr Nowojski
> Assignee: Piotr Nowojski
> Priority: Major
> Labels: pull-request-available
>
> Queries like:
> {code:java}
> SELECT
> o.amount * r.rate
> FROM
> Orders AS o,
> LATERAL TABLE (Rates(o.rowtime)) AS r
> WHERE o.currency = r.currency{code}
> should evaluate to valid plan with versioned joins plan node.
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