Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/16233#discussion_r93898018
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -510,32 +510,94 @@ class Analyzer(
* Replaces [[UnresolvedRelation]]s with concrete relations from the
catalog.
*/
object ResolveRelations extends Rule[LogicalPlan] {
- private def lookupTableFromCatalog(u: UnresolvedRelation): LogicalPlan
= {
+
+ def apply(plan: LogicalPlan): LogicalPlan = plan resolveOperators {
+ case i @ InsertIntoTable(u: UnresolvedRelation, parts, child, _, _)
if child.resolved =>
+ i.copy(table = EliminateSubqueryAliases(lookupTableFromCatalog(u)))
+ case u: UnresolvedRelation => resolveRelation(u)
+ }
+
+ // 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.
+ //
+ // Note this is compatible with the views defined by older versions of
Spark(before 2.2), which
+ // have empty defaultDatabase and all the relations in viewText have
database part defined.
+ def resolveRelation(
+ plan: LogicalPlan,
+ defaultDatabase: Option[String] = None): LogicalPlan = plan match {
--- End diff --
Let's explain defaultDatabase more, like when we need it, when it is set,
and how it is different from the current database in the session catalog.
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