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https://issues.apache.org/jira/browse/FLINK-4549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15516450#comment-15516450
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ASF GitHub Bot commented on FLINK-4549:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/2500#discussion_r80243251
--- Diff: docs/dev/table_api.md ---
@@ -2442,6 +3141,18 @@ object TimestampModifier extends ScalarFunction {
</div>
</div>
+### Limitations
+
+Not supported at all yet:
--- End diff --
"The following operations are not supported yet:"
> Test and document implicitly supported SQL functions
> ----------------------------------------------------
>
> Key: FLINK-4549
> URL: https://issues.apache.org/jira/browse/FLINK-4549
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Timo Walther
> Assignee: Timo Walther
>
> Calcite supports many SQL functions by translating them into {{RexNode}} s.
> However, SQL functions like {{NULLIF}}, {{OVERLAPS}} are neither tested nor
> document although supported.
> These functions should be tested and added to the documentation. We could
> adopt parts from the Calcite documentation.
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