jiwen624 commented on code in PR #55329:
URL: https://github.com/apache/spark/pull/55329#discussion_r3328106583


##########
sql/core/src/test/scala/org/apache/spark/sql/connector/MergeIntoSchemaEvolutionBasicTests.scala:
##########
@@ -1265,4 +1265,42 @@ trait MergeIntoSchemaEvolutionBasicTests extends 
MergeIntoSchemaEvolutionSuiteBa
     expected = Seq((1, "hr")).toDF("pk", "dep"),
     expectedWithoutEvolution = Seq((1, "hr")).toDF("pk", "dep")
   )
+
+  for (colName <- Seq("job.title", "job title")) {

Review Comment:
   I need to correct myself here (sorry to have confused you): `1st` and `from` 
can be handled properly (not failing) with/without the fix so they, although 
looking like “special cases” too, may not be good candidates to demonstrate the 
issue/fix. (The remaining two cases: col name with dot or space fail without 
the fix and pass with it. ) Because of this, I wouldn't recommend adding them 
back as it could be misleading - does that sound reasonable?



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