Zoltán Borók-Nagy created IMPALA-11655:
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Summary: Impala should set merge-on-read by default
Key: IMPALA-11655
URL: https://issues.apache.org/jira/browse/IMPALA-11655
Project: IMPALA
Issue Type: Bug
Components: Frontend
Reporter: Zoltán Borók-Nagy
Similarly to HIVE-26596 Impala should set merge-on-read delete mode for V2
tables, unless otherwise specified:
* during table creation with 'format-version'='2'
* during alter table set tblproperties 'format-version'='2'
We do so because in the foreseeable future Impala will only support
merge-on-read (on the write-side, on the read side copy-on-write is also
supported). Also, currently Hive only supports merge-on-read for DELETEs and
UPDATEs.
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