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Posted to issues-all@impala.apache.org by "ASF subversion and git services (Jira)" <ji...@apache.org> on 2026/06/12 17:07:00 UTC
[jira] [Commented] (IMPALA-14833) Iceberg V3 write-default values in MERGE statements
[ https://issues.apache.org/jira/browse/IMPALA-14833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18088596#comment-18088596 ]
ASF subversion and git services commented on IMPALA-14833:
----------------------------------------------------------
Commit 3af960a2665eb702aeb40b1ab5377bf6241e1593 in impala's branch refs/heads/master from Arnab Karmakar
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=3af960a26 ]
IMPALA-14833: Add Iceberg V3 write-default support to MERGE INSERT
Earlier, MERGE INSERT with a column permutation that omitted
columns with write-defaults would fill them with NULL. Now, for
Iceberg tables, unmentioned columns use the write-default value
defined in the Iceberg schema metadata (falling back to NULL when
no write-default is set).
Testing:
- Added e2e tests covering:
- MERGE INSERT with column permutation omitting a column that
has a write-default (verifies default is applied)
- MERGE INSERT with all columns explicit (default not used)
- MERGE INSERT with explicit NULL (overrides write-default)
- MERGE INSERT with all data types that support write-defaults
(INT, BIGINT, FLOAT, DOUBLE, STRING, DATE, BOOLEAN, DECIMAL)
Change-Id: I5d2960b1517c67eaece001875079041d33b19cec
Reviewed-on: http://gerrit.cloudera.org:8080/24424
Reviewed-by: Impala Public Jenkins <im...@cloudera.com>
Tested-by: Impala Public Jenkins <im...@cloudera.com>
> Iceberg V3 write-default values in MERGE statements
> ---------------------------------------------------
>
> Key: IMPALA-14833
> URL: https://issues.apache.org/jira/browse/IMPALA-14833
> Project: IMPALA
> Issue Type: Improvement
> Reporter: Arnab Karmakar
> Assignee: Arnab Karmakar
> Priority: Major
>
> The MERGE statement should support Iceberg V3 write-default values similar to INSERT statements. Currently, IMPALA-14589 adds support for initial-default and write-default in INSERT statements via InsertStmt.java, but MERGE statements do not yet apply write-default when columns are unmentioned in UPDATE or INSERT clauses.
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