[jira] [Updated] (FLINK-20794) Support to select distinct columns in the Table API

["Yun Gao (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-20794?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yun Gao updated FLINK-20794:
----------------------------
    Fix Version/s: 1.16.0

> Support to select distinct columns in the Table API
> ---------------------------------------------------
>
>                 Key: FLINK-20794
>                 URL: https://issues.apache.org/jira/browse/FLINK-20794
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table SQL / API
>            Reporter: Dian Fu
>            Priority: Major
>             Fix For: 1.15.0, 1.16.0
>
>
> Currently, there is no corresponding functionality in Table API for the following SQL:
> {code:java}
> SELECT DISTINCT users FROM Orders
> {code}
> For example, for the following job:
> {code:java}
> table.select("distinct a")
> {code}
> It will thrown the following exception:
> {code:java}
> org.apache.flink.table.api.ExpressionParserException: Could not parse expression at column 10: ',' expected but 'a' foundorg.apache.flink.table.api.ExpressionParserException: Could not parse expression at column 10: ',' expected but 'a' founddistinct a         ^
>  at org.apache.flink.table.expressions.PlannerExpressionParserImpl$.throwError(PlannerExpressionParserImpl.scala:726) at org.apache.flink.table.expressions.PlannerExpressionParserImpl$.parseExpressionList(PlannerExpressionParserImpl.scala:710) at org.apache.flink.table.expressions.PlannerExpressionParserImpl.parseExpressionList(PlannerExpressionParserImpl.scala:47) at org.apache.flink.table.expressions.ExpressionParser.parseExpressionList(ExpressionParser.java:40) at org.apache.flink.table.api.internal.TableImpl.select(TableImpl.java:121){code}



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