cloud-fan commented on code in PR #49772:
URL: https://github.com/apache/spark/pull/49772#discussion_r1954019289
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/ResolveDDLCommandStringTypes.scala:
##########
@@ -155,22 +123,22 @@ object ResolveDefaultStringTypes extends
Rule[LogicalPlan] {
dataType.existsRecursively(isDefaultStringType)
private def isDefaultStringType(dataType: DataType): Boolean = {
+ // STRING (without explicit collation) is considered default string type.
+ // STRING COLLATE <collation_name> (with explicit collation) is not
considered
+ // default string type even when explicit collation is UTF8_BINARY
(default collation).
dataType match {
- case st: StringType =>
- // should only return true for StringType object and not
StringType("UTF8_BINARY")
- st.eq(StringType) || st.isInstanceOf[TemporaryStringType]
+ // should only return true for StringType object and not for
StringType("UTF8_BINARY")
+ case st: StringType => st.eq(StringType)
case _ => false
}
}
private def replaceDefaultStringType(dataType: DataType, newType:
StringType): DataType = {
+ // Should replace STRING with the new type.
+ // Should not replace STRING COLLATE UTF8_BINARY, as that is explicit
collation.
dataType.transformRecursively {
case currentType: StringType if isDefaultStringType(currentType) =>
- if (currentType == newType) {
- TemporaryStringType()
- } else {
- newType
- }
+ newType
Review Comment:
or can we move this rule to `sql/core` as an extended resolution rule in
https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/internal/BaseSessionStateBuilder.scala#L212
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