maropu commented on a change in pull request #27965: [SPARK-31205][SQL] support
string literal as the second argument of date_add/date_sub functions
URL: https://github.com/apache/spark/pull/27965#discussion_r395585654
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
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@@ -1043,6 +1044,22 @@ object TypeCoercion {
}
}
}
+
+ /**
+ * A special rule to support string literal as the second argument of
date_add/date_sub functions,
+ * to keep backward compatibility.
+ * TODO: revisit the type coercion rules for string.
+ */
+ object StringLiteralCoercion extends TypeCoercionRule {
+ override protected def coerceTypes(plan: LogicalPlan): LogicalPlan = plan
resolveExpressions {
+ // Skip nodes who's children have not been resolved yet.
+ case e if !e.childrenResolved => e
+ case DateAdd(l, r) if r.dataType == StringType && r.foldable =>
+ DateAdd(l, AnsiCast(r, IntegerType))
Review comment:
Ah, yes. I rechecked the references of implicit casts in some databases, as
you said, the case seems to be acceptable.
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