Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18185#discussion_r128443990
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala
---
@@ -753,17 +753,26 @@ class AstBuilder(conf: SQLConf) extends
SqlBaseBaseVisitor[AnyRef] with Logging
* hooks.
*/
override def visitAliasedQuery(ctx: AliasedQueryContext): LogicalPlan =
withOrigin(ctx) {
- val alias = if (ctx.strictIdentifier == null) {
+ val alias = if (ctx.tableAlias.strictIdentifier == null) {
// For un-aliased subqueries, use a default alias name that is not
likely to conflict with
// normal subquery names, so that parent operators can only access
the columns in subquery by
// unqualified names. Users can still use this special qualifier to
access columns if they
// know it, but that's not recommended.
"__auto_generated_subquery_name"
} else {
- ctx.strictIdentifier.getText
+ ctx.tableAlias.strictIdentifier.getText
}
- SubqueryAlias(alias,
plan(ctx.queryNoWith).optionalMap(ctx.sample)(withSample))
+ val columnNamesOption = if (ctx.tableAlias.identifierList != null) {
+ Some(visitIdentifierList(ctx.tableAlias.identifierList)).map { names
=>
+ names.map(n => UnresolvedAttribute(n :: Nil))
+ }
+ } else {
+ None
+ }
+
+ SubqueryAlias(alias,
plan(ctx.queryNoWith).optionalMap(ctx.sample)(withSample),
--- End diff --
The impact of changing `SubqueryAlias` is too big. How about adding a new
operator node `UnresolvedSubqueryAlias`? In the analyzer,
`UnresolvedSubqueryAlias` will be replaced by `Project` + `SubqueryAlias` ?
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