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https://issues.apache.org/jira/browse/HIVE-19115?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eugene Koifman updated HIVE-19115:
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Component/s: Transactions
Query Planning
> 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
> Components: Query Planning, Transactions
> Reporter: Gopal V
> Priority: Major
>
> {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;
> 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 THEN UPDATE SET ts = current_timestamp
> when not matched 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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