stefankandic commented on code in PR #49103:
URL: https://github.com/apache/spark/pull/49103#discussion_r1899530240
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CollationTypeCoercion.scala:
##########
@@ -461,6 +421,66 @@ object CollationTypeCoercion {
else right
}
}
+
+ /**
+ * Throws an analysis exception if the new data type has indeterminate
collation,
+ * and the expression is not allowed to have inputs with indeterminate
collations.
+ */
+ private def checkIndeterminateCollation(expression: Expression, newDataType:
DataType): Unit = {
+ if (shouldFailWithIndeterminateCollation(expression, newDataType)) {
+ expression.failAnalysis(
+ errorClass = "INDETERMINATE_COLLATION_IN_EXPRESSION",
+ messageParameters = Map("expr" -> toSQLExpr(expression)))
+ }
+ }
+
+ /**
+ * Returns whether the given expression which isn't allowed to have inputs
with indeterminate
+ * collations has indeterminate collation.
+ */
+ private def shouldFailWithIndeterminateCollation(expression: Expression):
Boolean = {
+ def getDataTypeSafe(e: Expression): DataType = try {
+ e.dataType
+ } catch {
+ case _: Throwable => NullType
+ }
+
+ expression.children.exists(child => expression.resolved &&
Review Comment:
Good catch, this was supposed to check if the child is resolved!
However we don't need this at all since we are only running the coercion if
the children are resolved:
https://github.com/apache/spark/blob/18bbddd2fe2dba04ab311e35ebdc6d69614c170f/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CollationTypeCasts.scala#L25
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