yuxiqian opened a new pull request, #3665:
URL: https://github.com/apache/flink-cdc/pull/3665

   This closes FLINK-36596. Requires FLINK-36461 being merged first.
   
   As described in docs, omitting `transform[*].projection` field in YAML 
definition should be equivalent to `projection: \*` expression. However, now 
schema change events will be dropped when there are no projection fields 
explicitly written down. For example, the following definition:
   
   ```yaml
   transform:
     - source-table: db.tbl
       filter: x > 0
   ```
   
   could not apply upstream schema change events to downstream due to the 
lacking of `projection` block, which would be surprising.
   
   Unifying the syntax of `projection: \*` and omitting `projection` field 
should fix this.


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