cloud-fan commented on code in PR #53487:
URL: https://github.com/apache/spark/pull/53487#discussion_r2626022988
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sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala:
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@@ -5414,6 +5414,16 @@ object SQLConf {
.booleanConf
.createWithDefault(false)
+ val LEGACY_CTE_DUPLICATE_ATTRIBUTE_NAMES =
+ buildConf("spark.sql.legacy.cteDuplicateAttributeNames")
+ .internal()
+ .doc("When true, CTE references sometimes (e.g., self-joins) may
incorrectly unify column" +
+ "names that differ only in casing (e.g., COLNAME and colname become
the same). This is" +
+ "the legacy behavior. When false, column name casing is preserved
correctly.")
+ .version("4.1.0")
Review Comment:
```suggestion
.version("4.2.0")
```
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