Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/18559#discussion_r126066311
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala
---
@@ -751,15 +751,17 @@ class AstBuilder extends SqlBaseBaseVisitor[AnyRef]
with Logging {
* hooks.
*/
override def visitAliasedQuery(ctx: AliasedQueryContext): LogicalPlan =
withOrigin(ctx) {
- // The unaliased subqueries in the FROM clause are disallowed. Instead
of rejecting it in
- // parser rules, we handle it here in order to provide better error
message.
- if (ctx.strictIdentifier == null) {
- throw new ParseException("The unaliased subqueries in the FROM
clause are not supported.",
- ctx)
+ val alias = if (ctx.strictIdentifier == null) {
+ // For un-aliased subqueries, ues a default alias name that is not
likely to conflict with
--- End diff --
nit: typo `ues`.
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