Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/20887#discussion_r177593580
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala
---
@@ -1152,7 +1152,18 @@ class AstBuilder(conf: SQLConf) extends
SqlBaseBaseVisitor[AnyRef] with Logging
* Create a [[Cast]] expression.
*/
override def visitCast(ctx: CastContext): Expression = withOrigin(ctx) {
- Cast(expression(ctx.expression), visitSparkDataType(ctx.dataType))
+ typedVisit[DataType](ctx.dataType) match {
+ case t: CharType =>
--- End diff --
I do not think this is the right thing we should do unless we can natively
support CHAR and VARCHAR.
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