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https://issues.apache.org/jira/browse/FLINK-20794?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dian Fu closed FLINK-20794.
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Fix Version/s: (was: 1.18.0)
Resolution: Not A Problem
> 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
> Assignee: Vishaal Selvaraj
> Priority: Major
> Attachments: screenshot-1.png
>
>
> 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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