yuxiqian opened a new pull request, #3557:
URL: https://github.com/apache/flink-cdc/pull/3557
Currently, transform doesn't work very well with schema evolution.
The main issue is that TransformOperator (including Pre- and Post-) simply
passes all upstream schema change events to downstream, which isn't correct
under most cases.
Here's corresponding operations this PR tries to do in various transform
rule definitions:
| | `*, ...`
| `..., *, ...` | `..., *`
| No asterisk |
|----------------------|------------------------------------------------------------------|-------------------------------------------------|------------------------------------------|---------------------------------------------|
| AddColumnEvent | Yes, but LAST position needs position reordering
(LAST -> AFTER) | Yes, but FIRST / LAST position needs reordering | Yes, but
FIRST position needs reordering | No |
| AlterColumnTypeEvent | Yes
| Yes | Yes
| Yes if that column was referenced |
| RenameColumnEvent | Yes
| Yes | Yes
| No, exception if that column was referenced |
| DropColumnEvent | Yes
| Yes | Yes
| No, exception if that column was referenced |
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