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https://issues.apache.org/jira/browse/CALCITE-5566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17697934#comment-17697934
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Benchao Li commented on CALCITE-5566:
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[~shpodg] I guess the reason is that the top agg has only one row, it's cost is
very small so that the JdbcAggregate does not win. This is similar with
CALCITE-5284.
> agg can't be pushed down correctly
> ----------------------------------
>
> Key: CALCITE-5566
> URL: https://issues.apache.org/jira/browse/CALCITE-5566
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.33.0
> Reporter: shampoo liu
> Priority: Major
>
> {code:sql}
> select count(*) from (select max("position_title") "position_title" from
> "foodmart"."employee" where "gender" like '%a%' group by "birth_date",
> "gender") where "position_title" like '%z%'
> {code}
> The plan generated from sql above is as this :
> {code:java}
> PLAN=EnumerableAggregate(group=[{}], EXPR$0=[COUNT()])
> JdbcToEnumerableConverter
> JdbcFilter(condition=[LIKE($2, '%z%')])
> JdbcAggregate(group=[{8, 15}], position_title=[MAX($5)])
> JdbcFilter(condition=[LIKE($15, '%a%')])
> JdbcTableScan(table=[[foodmart, employee]])
> {code}
> Expected:
> {code:java}
> PLAN=JdbcToEnumerableConverter
> JdbcAggregate(group=[{}], EXPR$0=[COUNT()])
> JdbcFilter(condition=[LIKE($2, '%z%')])
> JdbcAggregate(group=[{8, 15}], position_title=[MAX($5)])
> JdbcFilter(condition=[LIKE($15, '%a%')])
> JdbcTableScan(table=[[foodmart, employee]])
> {code}
> test case:
> https://github.com/shpodg/calcite/commit/7c7aa35ca9864243e39b8d0559f820c342860754
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