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https://issues.apache.org/jira/browse/FLINK-6584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16217041#comment-16217041
]
ASF GitHub Bot commented on FLINK-6584:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/4199#discussion_r146575845
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/rules/common/WindowPropertiesRule.scala
---
@@ -0,0 +1,256 @@
+/*
+ * 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.{RelOptRule, RelOptRuleCall,
RelOptRuleOperand}
+import org.apache.calcite.rel.RelNode
+import org.apache.calcite.rel.logical.{LogicalFilter, LogicalProject}
+import org.apache.calcite.rex.{RexCall, RexNode}
+import org.apache.calcite.tools.RelBuilder
+import org.apache.flink.table.api.{TableException, ValidationException}
+import org.apache.flink.table.calcite.FlinkRelBuilder.NamedWindowProperty
+import org.apache.flink.table.expressions._
+import org.apache.flink.table.plan.logical.rel.LogicalWindowAggregate
+import org.apache.flink.table.validate.BasicOperatorTable
+
+import scala.collection.JavaConversions._
+
+abstract class WindowPropertiesBaseRule(rulePredicate: RelOptRuleOperand,
ruleName: String)
+ extends RelOptRule(rulePredicate, ruleName) {
+
+ override def matches(call: RelOptRuleCall): Boolean = {
+ val project = call.rel(0).asInstanceOf[LogicalProject]
+ // project includes at least on group auxiliary function
+
+ def hasGroupAuxiliaries(node: RexNode): Boolean = {
+ node match {
+ case c: RexCall if c.getOperator.isGroupAuxiliary => true
+ case c: RexCall =>
+ c.operands.exists(hasGroupAuxiliaries)
+ case _ => false
+ }
+ }
+
+ project.getProjects.exists(hasGroupAuxiliaries)
+ }
+
+ def convertWindowNodes(
+ builder: RelBuilder,
+ project: LogicalProject,
+ filter: Option[LogicalFilter],
+ innerProject: LogicalProject,
+ agg: LogicalWindowAggregate)
+ : RelNode = {
+
+ val rexBuilder = builder.getRexBuilder
+
+ val window = agg.getWindow
+
+ val isRowtime =
ExpressionUtils.isRowtimeAttribute(window.timeAttribute)
+ val isProctime =
ExpressionUtils.isProctimeAttribute(window.timeAttribute)
+
+ def propertyName(name: String): String =
+ window.aliasAttribute.asInstanceOf[WindowReference].name + name
+
+ val startEndProperties = Seq(
+ NamedWindowProperty(propertyName("start"),
WindowStart(window.aliasAttribute)),
+ NamedWindowProperty(propertyName("end"),
WindowEnd(window.aliasAttribute)))
+
+ // allow rowtime/proctime for rowtime windows and proctime for
proctime windows
+ val timeProperties = if (isRowtime) {
+ Seq(
+ NamedWindowProperty(propertyName("rowtime"),
RowtimeAttribute(window.aliasAttribute)),
+ NamedWindowProperty(propertyName("proctime"),
ProctimeAttribute(window.aliasAttribute)))
+ } else if (isProctime) {
+ Seq(NamedWindowProperty(propertyName("proctime"),
ProctimeAttribute(window.aliasAttribute)))
+ } else {
+ Seq()
+ }
+
+ val properties = startEndProperties ++ timeProperties
+
+ // retrieve window start and end properties
--- End diff --
`retrieve window properties`?
> Support multiple consecutive windows in SQL
> -------------------------------------------
>
> Key: FLINK-6584
> URL: https://issues.apache.org/jira/browse/FLINK-6584
> Project: Flink
> Issue Type: New Feature
> Components: Table API & SQL
> Reporter: Timo Walther
> Assignee: Timo Walther
> Priority: Blocker
> Fix For: 1.4.0
>
>
> Right now, the Table API supports multiple consecutive windows as follows:
> {code}
> val table = stream.toTable(tEnv, 'rowtime.rowtime, 'int, 'double, 'float,
> 'bigdec, 'string)
> val t = table
> .window(Tumble over 2.millis on 'rowtime as 'w)
> .groupBy('w)
> .select('w.rowtime as 'rowtime, 'int.count as 'int)
> .window(Tumble over 4.millis on 'rowtime as 'w2)
> .groupBy('w2)
> .select('w2.rowtime, 'w2.end, 'int.count)
> {code}
> Similar behavior should be supported by the SQL API as well. We need to
> introduce a new auxiliary group function, but this should happen in sync with
> Apache Calcite.
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