Gopal V created HIVE-19115:
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Summary: Merge: Semijoin hints are dropped by the merge
Key: HIVE-19115
URL: https://issues.apache.org/jira/browse/HIVE-19115
Project: Hive
Issue Type: Bug
Reporter: Gopal V
{code}
create table target stored as orc as select ss_ticket_number, ss_item_sk,
current_timestamp as `ts` from tpcds_bin_partitioned_orc_1000.store_sales;
create table source stored as orc as select sr_ticket_number, sr_item_sk,
d_date from tpcds_bin_partitioned_orc_1000.store_returns join
tpcds_bin_partitioned_orc_1000.date_dim where d_date_sk = sr_returned_date_sk;
explain
merge /* +semi(T, sr_ticket_number, S, 10000) */ into target T using (select *
from source where year(d_date) = 1998) S ON T.ss_ticket_number =
S.sr_ticket_number and sr_item_sk = ss_item_sk
when matched and ss_item_sk is null THEN UPDATE SET ts = current_timestamp
when not matched and ss_item_sk is null and sr_item_sk is not null and
sr_ticket_number is not null THEN INSERT VALUES(S.sr_ticket_number,
S.sr_item_sk, current_timestamp);
{code}
The semijoin hints are ignored and the code says
{code}
todo: do we care to preserve comments in original SQL?
{code}
https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/parse/UpdateDeleteSemanticAnalyzer.java#L624
in this case we do.
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