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Posted to issues@calcite.apache.org by "Julian Hyde (Jira)" <ji...@apache.org> on 2020/09/12 20:45:00 UTC
[jira] [Commented] (CALCITE-4251) Overload
RelMetadataQuery#getColumnOrigin method
[ https://issues.apache.org/jira/browse/CALCITE-4251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17194856#comment-17194856 ]
Julian Hyde commented on CALCITE-4251:
--------------------------------------
By 'overload', you mean add more parameters? If so, what parameters?
> Overload RelMetadataQuery#getColumnOrigin method
> ------------------------------------------------
>
> Key: CALCITE-4251
> URL: https://issues.apache.org/jira/browse/CALCITE-4251
> Project: Calcite
> Issue Type: Wish
> Reporter: xzh_dz
> Priority: Major
>
> A case:
>
> {code:java}
> //
> select col1, col2 , sum(count_col4) as sum_col4
> from (
> select col1, col2, col3, count(col4) as count_col4
> from tbl
> group by col1, col2, col3
> )
> group by col1, col2
> {code}
> When i try to get the `sum_col4` origin column field,it will return null and it is derived. we always get the origin column although it is derived. We should overload this method.
>
>
>
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