Gopal V created HIVE-19985:
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Summary: ACID: Skip decoding the ROW__ID sections for read-only
queries
Key: HIVE-19985
URL: https://issues.apache.org/jira/browse/HIVE-19985
Project: Hive
Issue Type: Improvement
Components: Transactions
Reporter: Gopal V
For a base_n file there are no aborted transactions within the file and if
there are no pending delete deltas, the entire ACID ROW__ID can be skipped for
all read-only queries (i.e SELECT), though it still needs to be projected out
for MERGE, UPDATE and DELETE queries.
This patch tries to entirely ignore the ACID ROW__ID fields for all tables
where there are no possible deletes or aborted transactions for an ACID split.
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