Gopal V created HIVE-21340:
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Summary: 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
Affects Versions: 4.0.0
Reporter: Gopal V
{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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