szehon-ho commented on code in PR #50959:
URL: https://github.com/apache/spark/pull/50959#discussion_r2098783455
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/ResolveDefaultColumnsUtil.scala:
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@@ -432,18 +432,34 @@ object ResolveDefaultColumns extends QueryErrorsBase
targetType: DataType,
colName: String): Option[Expression] = {
expr match {
- case l: Literal if !Seq(targetType, l.dataType).exists(_ match {
+ case l: Literal => defaultValueFromWiderType(l, targetType, colName)
Review Comment:
To explain this, the analyze() function in this class for strings does the
following
1. analyze/ checkAnalyze
2. constant fold
3. cast
However, because we add the rule in TypeCoercion, it runs before constant
folding. Hence, relaxing the cast code to also take Expression instead of
Literal.
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