Thomas Tauber-Marshall created IMPALA-7832:
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Summary: Support IF NOT EXISTS in alter table add columns
Key: IMPALA-7832
URL: https://issues.apache.org/jira/browse/IMPALA-7832
Project: IMPALA
Issue Type: New Feature
Components: Frontend
Affects Versions: Impala 3.1.0
Reporter: Thomas Tauber-Marshall
alter table <table_name> add [if not exists] columns (<name> <type> [, <name>
<type>...])
would add the column only if a column of the same name does not already exist
Probably worth checking out what other databases do in different situations,
eg. if the column already exists but with a different type, if "replace" is
used instead of "add", etc.
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