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https://issues.apache.org/jira/browse/FLINK-5624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15864011#comment-15864011
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ASF GitHub Bot commented on FLINK-5624:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3252#discussion_r100845516
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/streaming.scala
---
@@ -0,0 +1,42 @@
+/*
+ * 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.expressions
+
+import org.apache.calcite.sql.`type`.{OperandTypes, ReturnTypes,
SqlTypeName}
+import org.apache.calcite.sql.validate.SqlMonotonicity
+import org.apache.calcite.sql._
+import org.apache.calcite.tools.RelBuilder
+import org.apache.flink.api.common.typeinfo.{SqlTimeTypeInfo,
TypeInformation}
+import org.apache.flink.table.api.TableException
+
+object EventTimeExtractor extends SqlFunction("ROWTIME",
SqlKind.OTHER_FUNCTION,
+ ReturnTypes.explicit(SqlTypeName.TIMESTAMP), null, OperandTypes.NILADIC,
+ SqlFunctionCategory.SYSTEM) {
+ override def getSyntax: SqlSyntax = SqlSyntax.FUNCTION
+
+ override def getMonotonicity(call: SqlOperatorBinding): SqlMonotonicity =
+ SqlMonotonicity.INCREASING
+}
+
+case class RowTime() extends LeafExpression {
--- End diff --
Use `CurrentTimestamp` like PR #3271
> Support tumbling window on streaming tables in the SQL API
> ----------------------------------------------------------
>
> Key: FLINK-5624
> URL: https://issues.apache.org/jira/browse/FLINK-5624
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Haohui Mai
> Assignee: Haohui Mai
>
> This is a follow up of FLINK-4691.
> FLINK-4691 adds supports for group-windows for streaming tables. This jira
> proposes to expose the functionality in the SQL layer via the {{GROUP BY}}
> clauses, as described in
> http://calcite.apache.org/docs/stream.html#tumbling-windows.
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