XnY-wei opened a new pull request, #65513:
URL: https://github.com/apache/doris/pull/65513
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
Previously, users had to drop and recreate an asynchronous
materialized view (MTMV) whenever they needed an additional
derived column. This is expensive because it forces a full
rebuild and invalidates downstream query rewriting.
This PR introduces `ALTER MATERIALIZED VIEW <mv> ADD COLUMN
<col> AS <expr>`, which lets users evolve the MTMV schema
in place by appending a new column derived from an expression
over the existing query.
` CREATE MATERIALIZED VIEW mv
BUILD IMMEDIATE REFRESH AUTO ON MANUAL
AS SELECT id, name FROM t;
ALTER MATERIALIZED VIEW mv ADD COLUMN name_len AS length(name);
REFRESH MATERIALIZED VIEW mv AUTO;
-- mv now has columns (id, name, name_len)`
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [ ] Unit Test
- [ ] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
- [ ] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
- Behavior changed:
- [ ] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [ ] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR should
merge into -->
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