Github user skambha commented on a diff in the pull request:
https://github.com/apache/spark/pull/17185#discussion_r206975896
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala
---
@@ -262,17 +262,47 @@ abstract class Star extends LeafExpression with
NamedExpression {
*/
case class UnresolvedStar(target: Option[Seq[String]]) extends Star with
Unevaluable {
- override def expand(input: LogicalPlan, resolver: Resolver):
Seq[NamedExpression] = {
+ /**
+ * Returns true if the nameParts match the qualifier of the attribute
+ *
+ * There are two checks: i) Check if the nameParts match the qualifier
fully.
+ * E.g. SELECT db.t1.* FROM db1.t1 In this case, the nameParts is
Seq("db1", "t1") and
--- End diff --
This (SELECT db1.t1.* FROM t1) would resolve correctly.
Also a similar scenario (details in Section 2 in Table A # 5 in the design
doc)
select db1.t1.i1 from t1 will resolve correctly when the current database
is db1.
I will explicitly add a test case for the db1.t1.* from t1 as well.
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