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https://issues.apache.org/jira/browse/CALCITE-4251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17195593#comment-17195593
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Julian Hyde commented on CALCITE-4251:
--------------------------------------
I see. With today's implementation, I don't it's possible to overload. However,
some providers (e.g. {{interface BuiltInMetadata.Size}} have multiple methods).
Please take a look at {{interface BuiltInMetadata.ColumnOrigin}} and say how
you propose to change it.
> 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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