Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/16233#discussion_r94103444
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -510,32 +510,93 @@ class Analyzer(
* Replaces [[UnresolvedRelation]]s with concrete relations from the
catalog.
*/
object ResolveRelations extends Rule[LogicalPlan] {
- private def lookupTableFromCatalog(u: UnresolvedRelation): LogicalPlan
= {
+
+ // If the unresolved relation is running directly on files, we just
return the original
+ // UnresolvedRelation, the plan will get resolved later. Else we look
up the table from catalog
+ // and change the default database name if it is a view.
+ // We usually look up a table from the default database if the table
identifier has an empty
+ // database part, for a view the default database should be the
currentDb when the view was
+ // created. When the case comes to resolving a nested view, the view
may have different default
--- End diff --
oh, nvm, even if we have `database.viewname`, dbname and viewname will be
inside the table identifier.
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