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https://issues.apache.org/jira/browse/FLINK-6693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16060700#comment-16060700
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ASF GitHub Bot commented on FLINK-6693:
---------------------------------------
Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/4078#discussion_r123717228
--- Diff:
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/expressions/DateTimeFunctionTest.scala
---
@@ -0,0 +1,49 @@
+/*
+ * 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 java.sql.Timestamp
+
+import org.apache.flink.api.common.typeinfo.{TypeInformation, Types}
+import org.apache.flink.api.java.typeutils.RowTypeInfo
+import org.apache.flink.table.api.scala._
+import org.apache.flink.table.expressions.utils.ExpressionTestBase
+import org.apache.flink.types.Row
+import org.junit.Test
+
+class DateTimeFunctionTest extends ExpressionTestBase {
+
+ @Test
+ def testDateFormat(): Unit = {
--- End diff --
Can you add 2 or 3 more complicated tests?
> Support DATE_FORMAT function in the Table / SQL API
> ---------------------------------------------------
>
> Key: FLINK-6693
> URL: https://issues.apache.org/jira/browse/FLINK-6693
> Project: Flink
> Issue Type: New Feature
> Components: Table API & SQL
> Reporter: Haohui Mai
> Assignee: Haohui Mai
>
> It would be quite handy to support the {{DATE_FORMAT}} function in Flink to
> support various date / time related operations:
> The specification of the {{DATE_FORMAT}} function can be found in
> https://prestodb.io/docs/current/functions/datetime.html.
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