[ https://issues.apache.org/jira/browse/FLINK-6101?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
lincoln.lee updated FLINK-6101: ------------------------------- Summary: GroupBy fields with expression can not be selected (was: GroupBy fields with expression can not be selected either using original name or expression ) > GroupBy fields with expression can not be selected > -------------------------------------------------- > > Key: FLINK-6101 > URL: https://issues.apache.org/jira/browse/FLINK-6101 > Project: Flink > Issue Type: Bug > Components: Table API & SQL > Reporter: lincoln.lee > > currently the TableAPI do not support selecting GroupBy fields with > expression either using original field name or the expression > {code} > val t = CollectionDataSets.get5TupleDataSet(env).toTable(tEnv, 'a, 'b, 'c, > 'd, 'e) > .groupBy('e, 'b % 3) > .select('b, 'c.min, 'e, 'a.avg, 'd.count) > {code} > caused > {code} > org.apache.flink.table.api.ValidationException: Cannot resolve [b] given > input [e, ('b % 3), TMP_0, TMP_1, TMP_2]. > {code} > (BTW, this syntax is invalid in RDBMS which will indicate the selected column > is invalid in the select list because it is not contained in either an > aggregate function or the GROUP BY clause in SQL Server.) > and > {code} > val t = CollectionDataSets.get5TupleDataSet(env).toTable(tEnv, 'a, 'b, 'c, > 'd, 'e) > .groupBy('e, 'b % 3) > .select('b%3, 'c.min, 'e, 'a.avg, 'd.count) > {code} > will also cause > {code} > org.apache.flink.table.api.ValidationException: Cannot resolve [b] given > input [e, ('b % 3), TMP_0, TMP_1, TMP_2]. > {code} > and add an alias in groupBy clause "group(e, 'b%3 as 'b)" work without avail > the only way to get this work can be > {code} > val t = CollectionDataSets.get5TupleDataSet(env).toTable(tEnv, 'a, 'b, 'c, > 'd, 'e) > .select('a, 'b%3 as 'b, 'c, 'd, 'e) > .groupBy('e, 'b) > .select('b, 'c.min, 'e, 'a.avg, 'd.count) > {code} > One way to solve this is to add support alias in groupBy clause ( it seems a > bit odd against SQL though TableAPI has a different groupBy grammar), > and I prefer to support select original expressions in groupBy clause(make > consistent with SQL). > as thus: > {code} > val t = CollectionDataSets.get5TupleDataSet(env).toTable(tEnv, 'a, 'b, 'c, > 'd, 'e) > .groupBy('e, 'b % 3) > .select('b % 3, 'c.min, 'e, 'a.avg, 'd.count) > {code} > What do you think? -- This message was sent by Atlassian JIRA (v6.3.15#6346)