kasakrisz opened a new pull request, #3967:
URL: https://github.com/apache/hive/pull/3967
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### What changes were proposed in this pull request?
Use DDL_SHARED write type when Materialized view stored by iceberg is
altered for enabling/disabling automatic query rewrite.
### Why are the changes needed?
Later Iceberg commit request an exclusive write lock on the MV while
updating data in metastore.
### Does this PR introduce _any_ user-facing change?
Yes, `alter materialized view <mv> [enable|disable] rewrite` not hangs and
times out.
### How was this patch tested?
```
mvn test -Dtest.output.overwrite -Dtest=TestIcebergCliDriver
-Dqfile=mv_iceberg_orc2.q -pl itests/qtest-iceberg -Piceberg -Pitests
```
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