DanielLeens commented on issue #12814:
URL: https://github.com/apache/seatunnel/issues/12814#issuecomment-6233673712

   Thank you — this is now a sufficiently precise implementation contract. The 
guard must run before `MultiTableManager.mergeSchema`, apply the carrier only 
when every participating container is `ROW`, and reject arrays/maps or 
malformed carrier text without silently changing their meaning. Keeping the 
source-side MySQL wide-DECIMAL mapping separately in #12841 is also the right 
boundary.
   
   Please implement this as a focused PR with the stated Spark 2.4 and 3.3 
coverage for top-level and nested ROW cases, mixed schemas, malformed carrier 
text, nulls, and decimal scale preservation. Classification: D — Spark 
schema-conversion design.


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