raminqaf commented on code in PR #27973:
URL: https://github.com/apache/flink/pull/27973#discussion_r3115867051
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flink-table/flink-table-runtime/src/main/java/org/apache/flink/table/runtime/functions/ptf/FromChangelogFunction.java:
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@@ -137,7 +138,10 @@ public void eval(
final StringData opCode = input.getString(opColumnIndex);
Review Comment:
That is true. Very good catch. Now I declared the the `op` column should be
non-null and added a validation check during planning. Added some test to back
it up
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