Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/8461#discussion_r37999952
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Catalog.scala
---
@@ -44,7 +90,20 @@ trait Catalog {
def tableExists(tableIdentifier: Seq[String]): Boolean
- def lookupRelation(
+ final def lookupRelation(
+ tableIdentifier: Seq[String],
+ alias: Option[String] = None): LogicalPlan = {
+ val tableIdent = processTableIdentifier(tableIdentifier)
+ if (tableIdent.length == 1 && tableIdent.head == TABLES_META_NAME) {
+ LocalRelation(tablesMetaOutput,
tablesMeta().map(tablesMetaConverter))
+ } else if (tableIdent.length == 1 && tableIdent.head ==
COLUMNS_META_NAME) {
+ LocalRelation(columnsMetaOutput,
columnsMeta().map(columnsMetaConverter))
+ } else {
+ lookupRelationInternal(tableIdentifier, alias)
+ }
+ }
+
+ protected def lookupRelationInternal(
--- End diff --
need some refactor here to git rid of this method, I'll try stackable trait
later.
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