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https://issues.apache.org/jira/browse/FLINK-6975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16083652#comment-16083652
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ASF GitHub Bot commented on FLINK-6975:
---------------------------------------
Github user wuchong commented on a diff in the pull request:
https://github.com/apache/flink/pull/4274#discussion_r126870651
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/scala/expressionDsl.scala
---
@@ -982,4 +982,27 @@ object randInteger {
}
}
+/**
+ * Returns the string that results from concatenating the arguments.
+ * Returns NULL if any argument is NULL.
+ */
+object concat {
+ def apply(strings: Expression*): Expression = {
--- End diff --
I would suggest to change this signature to `apply(first: Expression,
second: Expression, rest: Expression*)` to avoid misusage such as `concat()`.
> Add CONCAT/CONCAT_WS supported in TableAPI
> ------------------------------------------
>
> Key: FLINK-6975
> URL: https://issues.apache.org/jira/browse/FLINK-6975
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Affects Versions: 1.4.0
> Reporter: sunjincheng
> Assignee: sunjincheng
> Labels: starter
>
> See FLINK-6925 for detail.
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