Github user xdcjie commented on a diff in the pull request:
https://github.com/apache/spark/pull/21447#discussion_r192068576
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala
---
@@ -338,6 +338,17 @@ class AstBuilder(conf: SQLConf) extends
SqlBaseBaseVisitor[AnyRef] with Logging
// Add where.
val withFilter = relation.optionalMap(where)(filter)
+ // Add project.
+ val namedExpressions = expressions.map {
+ case e: NamedExpression => e
+ case e: Expression => UnresolvedAlias(e)
--- End diff --
I tried, "case e: _ => UnresolveAlias(e)" will occur "unbound wildcard
type" complie error. I will revert to "case e: Expression =>
UnresolvedAlias(e)".
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