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https://issues.apache.org/jira/browse/FLINK-3794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15251808#comment-15251808
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ASF GitHub Bot commented on FLINK-3794:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1921#discussion_r60570764
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/table.scala
---
@@ -280,8 +293,14 @@ class Table(
* }}}
*/
def groupBy(fields: String): GroupedTable = {
- val fieldsExpr = ExpressionParser.parseExpressionList(fields)
- groupBy(fieldsExpr: _*)
+ // group by on stream tables is currently not supported
+ tableEnv match {
--- End diff --
This check can be skip. It will be catched by the other `groupBy`.
> Add checks for unsupported operations in streaming table API
> ------------------------------------------------------------
>
> Key: FLINK-3794
> URL: https://issues.apache.org/jira/browse/FLINK-3794
> Project: Flink
> Issue Type: Improvement
> Components: Table API
> Affects Versions: 1.1.0
> Reporter: Vasia Kalavri
> Assignee: Vasia Kalavri
>
> Unsupported operations on streaming tables currently fail during plan
> translation. It would be nicer to add checks in the Table API methods and
> fail with an informative message that the operation is not supported. The
> operations that are not currently supported are:
> - aggregations inside select
> - groupBy
> - distinct
> - join
> We can simply check if the Table's environment is a streaming environment and
> throw an unsupported operation exception.
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