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_r396086134
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
##########
@@ -1043,6 +1045,34 @@ object TypeCoercion {
}
}
}
+
+ /**
+ * A special rule to support string literal as the second argument of
date_add/date_sub functions,
+ * to keep backward compatibility as a temporary workaround.
+ * TODO(SPARK-28589): implement ANSI type type coercion and handle string
literals.
+ */
+ object StringLiteralCoercion extends TypeCoercionRule {
Review comment:
Oh, I see.
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