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Posted to gitbox@hive.apache.org by GitBox <gi...@apache.org> on 2022/03/18 15:59:20 UTC
[GitHub] [hive] kovjanos opened a new pull request #3119: HIVE-26049: Inconsistent TBL_NAME lengths in HMS schema
kovjanos opened a new pull request #3119:
URL: https://github.com/apache/hive/pull/3119
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### What changes were proposed in this pull request?
Make the TBL_NAME references consistent in length
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### Why are the changes needed?
TBLS allows tables defined with name up to 256 character long but transaction specific tables allow only names up to 128 characters. This makes transaction related processing - like locking such a table - broken. The changes fixes this issue. The option to extend the shorter definitions instead of shortening the others was chosen to maintain backward compatibility. That way if someone already has long table names will be able to keep using them.
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### Does this PR introduce _any_ user-facing change?
No.
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### How was this patch tested?
Was tested on a live system with the migration of metadata.
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[GitHub] [hive] kovjanos commented on pull request #3119: HIVE-26049: Inconsistent TBL_NAME lengths in HMS schema
Posted by GitBox <gi...@apache.org>.
kovjanos commented on pull request #3119:
URL: https://github.com/apache/hive/pull/3119#issuecomment-1072850355
Just found an issue in the MSSQL upgrade code: compared to others it has an extra PK referencing the _TABLE column which makes the ALTER to fail.
I'll fix it in the next commit...
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[GitHub] [hive] pvary merged pull request #3119: HIVE-26049: Inconsistent TBL_NAME lengths in HMS schema
Posted by GitBox <gi...@apache.org>.
pvary merged pull request #3119:
URL: https://github.com/apache/hive/pull/3119
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[GitHub] [hive] kovjanos commented on pull request #3119: HIVE-26049: Inconsistent TBL_NAME lengths in HMS schema
Posted by GitBox <gi...@apache.org>.
kovjanos commented on pull request #3119:
URL: https://github.com/apache/hive/pull/3119#issuecomment-1072915735
The upgrade script was adjusted for MSSQL and MYSQL as these engines lost the NOT NULL constraint on ALTER. The others - Derby, Postgres and Oracle - don't need this, actually this would be invalid ALTER statement for those engines.
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