billryan opened a new pull request, #64071:
URL: https://github.com/apache/doris/pull/64071
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
For routine load jobs, if we have thousands of columns to import, we can use
json format let doris automatically match the column name with table schema.
But for some scenarios, the upstream data does not have the column name(can be
derived from current columns) and we can not add new column name easily, so we
consider if we can just specify the new derived column only and let doris fill
the missing columns with table schema.
e.g.
The MQ data have `stat_time_day` field but does not have `p_date` column, we
can add new column like this `p_date = stat_time_day`, fill missing columns
from table schema.
```sql
CREATE ROUTINE LOAD db.job_name ON table_a
COLUMNS(p_date = stat_time_day)
PROPERTIES (
"format" = "json",
"fill_missing_columns" = "true"
)
FROM KAFKA (...);
```
### 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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