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https://issues.apache.org/jira/browse/FLINK-9713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16614733#comment-16614733
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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_r217633369
##########
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) =>
Review comment:
Why do we need a distinction here? Shouldn't a field `timeAttribute:
Expression` just contain what it says? A time attribute which is resolved field
reference with a special data type.
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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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