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https://issues.apache.org/jira/browse/FLINK-2980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15834618#comment-15834618
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ASF GitHub Bot commented on FLINK-2980:
---------------------------------------
Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/3026#discussion_r97313779
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/ExpressionParser.scala
---
@@ -375,15 +393,26 @@ object ExpressionParser extends JavaTokenParsers with
PackratParsers {
lazy val prefixFlattening: PackratParser[Expression] =
FLATTEN ~ "(" ~> composite <~ ")" ^^ { e => Flattening(e) }
+ lazy val prefixGrouping: PackratParser[Expression] =
--- End diff --
If you add `grouping`, `groupingId` and `groupId` to the
`FunctionCatalog.builtInFunctions`. We don't need the following lines.
> Add CUBE/ROLLUP/GROUPING SETS operator in Table API.
> ----------------------------------------------------
>
> Key: FLINK-2980
> URL: https://issues.apache.org/jira/browse/FLINK-2980
> Project: Flink
> Issue Type: New Feature
> Components: Documentation, Table API & SQL
> Reporter: Chengxiang Li
> Assignee: Alexander Chermenin
> Attachments: Cube-Rollup-GroupSet design doc in Flink.pdf
>
>
> Computing aggregates over a cube/rollup/grouping sets of several dimensions
> is a common operation in data warehousing. It would be nice to have them in
> Table API.
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