caiconghui opened a new issue #5924:
URL: https://github.com/apache/incubator-doris/issues/5924
**Describe the bug**
Alter table add column operation becomes slow when upgrade doris from 0.12
to 0.13, 0.14,
before upgrade, alter table add column operation may cost several minutes
after upgrade, alter table add column opertion may easily failed due to
timeout
**To Reproduce**
upgrade doris version from 0.12 to 0.13 or 0.14
**Expected behavior**
alter table add column succeed
**Additional context**
we should consider other way to convert storage format from v1 to v2 instead
of by alter table, because it may cause many
failure when user alter table, which may have a great negative impact on the
business
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