cloud-fan commented on a change in pull request #24806: [WIP][SPARK-27856][SQL]
Only allow type upcasting when inserting table
URL: https://github.com/apache/spark/pull/24806#discussion_r292768996
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala
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@@ -128,8 +128,10 @@ object Cast {
case _ if from == to => true
case (from: NumericType, to: DecimalType) if to.isWiderThan(from) => true
case (from: DecimalType, to: NumericType) if from.isTighterThan(to) => true
- case (f, t) if legalNumericPrecedence(f, t) => true
+ case (f: NumericType, t: NumericType) if legalNumericPrecedence(f, t) =>
true
+
case (DateType, TimestampType) => true
+ case (NullType, _) => false
Review comment:
Why can't we upcast null to other nullable types? I think it's pretty common
to write `INSERT INTO tbl VALUES (1, null)`
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