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https://issues.apache.org/jira/browse/HIVE-21340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16784028#comment-16784028
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Vineet Garg commented on HIVE-21340:
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[~jcamachorodriguez] RB link: https://reviews.apache.org/r/70125/
> CBO: Prune non-key columns feeding into a SemiJoin
> --------------------------------------------------
>
> Key: HIVE-21340
> URL: https://issues.apache.org/jira/browse/HIVE-21340
> Project: Hive
> Issue Type: Bug
> Components: CBO, Query Planning
> Affects Versions: 4.0.0
> Reporter: Gopal V
> Assignee: Vineet Garg
> Priority: Major
> Attachments: HIVE-21340.1.patch, HIVE-21340.2.patch,
> HIVE-21340.3.patch
>
>
> {code}
> explain cbo
> with ss as
> (select count(1), ss_item_sk, ss_ticket_number from
> store_sales group by ss_item_sk, ss_ticket_number
> having count(1) > 1)
> select count(1) from item where i_item_sk IN (select ss_item_sk from ss);
> {code}
> Notice the {{HiveProject(ss_item_sk=[$0], ss_ticket_number=[$1], $f2=[$2])}}
> Only ss_item_sk is relevant for the HiveSemiJoin
> {code}
> CBO PLAN:
> HiveAggregate(group=[{}], agg#0=[count()])
> HiveSemiJoin(condition=[=($0, $1)], joinType=[inner])
> HiveProject(i_item_sk=[$0])
> HiveFilter(condition=[IS NOT NULL($0)])
> HiveTableScan(table=[[tpcds_copy_orc_partitioned_10000, item]],
> table:alias=[item])
> HiveProject(ss_item_sk=[$0], ss_ticket_number=[$1], $f2=[$2])
> HiveFilter(condition=[>($2, 1)])
> HiveAggregate(group=[{1, 8}], agg#0=[count()])
> HiveFilter(condition=[IS NOT NULL($1)])
> HiveTableScan(table=[[tpcds_copy_orc_partitioned_10000,
> store_sales]], table:alias=[store_sales])
> {code}
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