Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18460#discussion_r143285500
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
---
@@ -100,6 +101,17 @@ object TypeCoercion {
case (_: TimestampType, _: DateType) | (_: DateType, _: TimestampType)
=>
Some(TimestampType)
+ case (t1 @ StructType(fields1), t2 @ StructType(fields2)) if
t1.sameType(t2) =>
+ Some(StructType(fields1.zip(fields2).map { case (f1, f2) =>
+ // Since `t1.sameType(t2)` is true, two StructTypes have the same
DataType
+ // except `name` (in case of `spark.sql.caseSensitive=false`) and
`nullable`.
+ // - Different names: use a lower case name because
findTightestCommonType is commutative.
+ // - Different nullabilities: `nullable` is true iff one of them
is nullable.
+ val name = if (f1.name == f2.name) f1.name else
f1.name.toLowerCase(Locale.ROOT)
--- End diff --
Do both `tab.Col1.a` and `tab.Col1.A`work well when case sensitivity is off?
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