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https://issues.apache.org/jira/browse/FLINK-6012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15960637#comment-15960637
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ASF GitHub Bot commented on FLINK-6012:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3693#discussion_r110360562
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/rules/common/WindowExpressionRule.scala
---
@@ -0,0 +1,117 @@
+/*
+ * 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.common
+
+import org.apache.calcite.plan.hep.HepRelVertex
+import org.apache.calcite.plan.{RelOptRule, RelOptRuleCall}
+import org.apache.calcite.rel.RelNode
+import org.apache.calcite.rel.logical.LogicalProject
+import org.apache.calcite.rex.{RexCall, RexNode}
+import org.apache.calcite.sql.fun.SqlStdOperatorTable
+import org.apache.flink.table.calcite.FlinkRelBuilder.NamedWindowProperty
+import org.apache.flink.table.expressions.{WindowEnd, WindowStart}
+import org.apache.flink.table.plan.logical._
+import org.apache.flink.table.plan.logical.rel.LogicalWindowAggregate
+
+import scala.collection.JavaConversions._
+
+class WindowExpressionRule
+ extends RelOptRule(
+ WindowExpressionRule.WINDOW_EXPRESSION_RULE_PREDICATE,
+ "WindowExpressionRule") {
+ override def matches(call: RelOptRuleCall): Boolean = {
+ val project = call.rel(0).asInstanceOf[LogicalProject]
+ val found = project.getProjects.find {
--- End diff --
use `exists()` instead of `find()`
> Support WindowStart / WindowEnd functions in streaming SQL
> ----------------------------------------------------------
>
> Key: FLINK-6012
> URL: https://issues.apache.org/jira/browse/FLINK-6012
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: Haohui Mai
> Assignee: Haohui Mai
>
> This jira proposes to add support for {{TUMBLE_START()}} / {{TUMBLE_END()}} /
> {{HOP_START()}} / {{HOP_END()}} / {{SESSUIB_START()}} / {{SESSION_END()}} in
> the planner in Flink.
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