Krisztian Kasa created HIVE-25369:
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Summary: Handle Sum0 when rebuilding materialized view
incrementally
Key: HIVE-25369
URL: https://issues.apache.org/jira/browse/HIVE-25369
Project: Hive
Issue Type: Improvement
Components: CBO, Materialized views
Reporter: Krisztian Kasa
Assignee: Krisztian Kasa
When rewriting MV insert overwrite plan to incremental rebuild plan a Sum0
aggregate function is used when aggregating count function subresults coming
from the existing MV data and the aggregated newly inserted/deleted records
since the last rebuild
{code}
create materialized view mat1 stored as orc TBLPROPERTIES
('transactional'='true') as
select t1.a, count(*) from t1
{code}
Insert overwrite plan:
{code}
HiveAggregate(group=[{0}], agg#0=[$SUM0($1)])
HiveUnion(all=[true])
HiveAggregate(group=[{0}], agg#0=[count()])
HiveProject($f0=[$0])
HiveFilter(condition=[<(2, $5.writeid)])
HiveTableScan(table=[[default, t1]], table:alias=[t1])
HiveTableScan(table=[[default, mat1]], table:alias=[default.mat1])
{code}
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