mihailom-db commented on code in PR #45643:
URL: https://github.com/apache/spark/pull/45643#discussion_r1537164175


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sql/core/src/test/scala/org/apache/spark/sql/CollationStringExpressionsSuite.scala:
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@@ -70,6 +74,152 @@ class CollationStringExpressionsSuite extends QueryTest 
with SharedSparkSession
     })
   }
 
+  test("INSTR check result on non-explicit default collation") {

Review Comment:
   Shouldn't we always make sure that previous behaviour was preserved for 
backwards compatibility? But I do agree that separate test is maybe not 
necessary, but could be merged with the following test.



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