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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9713) Support versioned joins in planning phase
Date Fri, 14 Sep 2018 12:17:04 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16614749#comment-16614749
] 

ASF GitHub Bot commented on FLINK-9713:
---------------------------------------

twalthr 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_r217641707
 
 

 ##########
 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
+    }
+    val tableFunction = rexCall.getOperator.asInstanceOf[TableSqlFunction]
+
+    if (!tableFunction.getTableFunction.isInstanceOf[TemporalTableFunction]) {
+      return null;
+    }
+    val temporalTableFunction = tableFunction.getTableFunction.asInstanceOf[TemporalTableFunction]
+
+    if (!rexCall.getOperands().size().equals(1)) {
 
 Review comment:
   This is already checked by higher layers. So we don't have to check it again here.

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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 &amp; 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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