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https://issues.apache.org/jira/browse/DRILL-2748?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Victoria Markman closed DRILL-2748.
-----------------------------------
> Filter is not pushed down into subquery with the group by
> ---------------------------------------------------------
>
> Key: DRILL-2748
> URL: https://issues.apache.org/jira/browse/DRILL-2748
> Project: Apache Drill
> Issue Type: Improvement
> Components: Query Planning & Optimization
> Affects Versions: 0.9.0, 1.0.0, 1.1.0
> Reporter: Victoria Markman
> Assignee: Jinfeng Ni
> Fix For: 1.2.0
>
> Attachments:
> 0001-DRILL-2748-Improve-cost-estimation-for-Drill-logical.patch
>
>
> I'm not sure about this one, theoretically filter could have been pushed into
> the subquery.
> {code}
> 0: jdbc:drill:schema=dfs> explain plan for select x, y, z from (select a1,
> b1, avg(a1) from t1 group by a1, b1) as sq(x, y, z) where x = 10;
> +------------+------------+
> | text | json |
> +------------+------------+
> | 00-00 Screen
> 00-01 Project(x=[$0], y=[$1], z=[$2])
> 00-02 Project(x=[$0], y=[$1], z=[CAST(/(CastHigh(CASE(=($3, 0), null,
> $2)), $3)):ANY NOT NULL])
> 00-03 SelectionVectorRemover
> 00-04 Filter(condition=[=($0, 10)])
> 00-05 HashAgg(group=[{0, 1}], agg#0=[$SUM0($0)],
> agg#1=[COUNT($0)])
> 00-06 Project(a1=[$1], b1=[$0])
> 00-07 Scan(groupscan=[ParquetGroupScan
> [entries=[ReadEntryWithPath [path=maprfs:/drill/testdata/predicates/t1]],
> selectionRoot=/drill/testdata/predicates/t1, numFiles=1, columns=[`a1`,
> `b1`]]])
> {code}
> Same with distinct in subquery:
> {code}
> 0: jdbc:drill:schema=dfs> explain plan for select x, y, z from ( select
> distinct a1, b1, c1 from t1 ) as sq(x, y, z) where x = 10;
> +------------+------------+
> | text | json |
> +------------+------------+
> | 00-00 Screen
> 00-01 Project(x=[$0], y=[$1], z=[$2])
> 00-02 Project(x=[$0], y=[$1], z=[$2])
> 00-03 SelectionVectorRemover
> 00-04 Filter(condition=[=($0, 10)])
> 00-05 HashAgg(group=[{0, 1, 2}])
> 00-06 Project(a1=[$2], b1=[$1], c1=[$0])
> 00-07 Scan(groupscan=[ParquetGroupScan
> [entries=[ReadEntryWithPath [path=maprfs:/drill/testdata/predicates/t1]],
> selectionRoot=/drill/testdata/predicates/t1, numFiles=1, columns=[`a1`, `b1`,
> `c1`]]])
> {code}
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