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https://issues.apache.org/jira/browse/FLINK-6693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16083492#comment-16083492
]
ASF GitHub Bot commented on FLINK-6693:
---------------------------------------
Github user haohui commented on a diff in the pull request:
https://github.com/apache/flink/pull/4078#discussion_r126870280
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/CodeGenerator.scala
---
@@ -2008,6 +2008,33 @@ class CodeGenerator(
}
/**
+ * Adds a reusable [[java.util.Random]] to the member area of the
generated [[Function]].
+ *
+ * The seed parameter must be a literal/constant expression.
+ *
+ * @return member variable term
+ */
+ def addReusableDateFormatter(format: GeneratedExpression): String = {
+ val fieldTerm = newName("dateFormatter")
+
+ val field =
+ s"""
+ |transient org.joda.time.format.DateTimeFormatter $fieldTerm;
+ |""".stripMargin
+ reusableMemberStatements.add(field)
+
+ val fieldInit =
+ s"""
+ |${format.code}
+ |$fieldTerm = org.apache.flink.table.runtime.functions.
+
|DateTimeFunctions$$.MODULE$$.createDateTimeFormatter(${format.resultTerm});
--- End diff --
This is because the runtime ``DateTimeFunctions`` has been ported to Scala.
This is the syntax to access the function.
> 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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