Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/14657#discussion_r75239485
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala
---
@@ -411,27 +411,29 @@ class SessionCatalog(
}
/**
- * Return a [[LogicalPlan]] that represents the given table.
+ * Return a [[LogicalPlan]] that represents the given table or view.
*
- * If a database is specified in `name`, this will return the table from
that database.
- * If no database is specified, this will first attempt to return a
temporary table with
- * the same name, then, if that does not exist, return the table from
the current database.
+ * If a database is specified in `name`, this will return the table/view
from that database.
+ * If no database is specified, this will first attempt to return a
temporary table/view with
+ * the same name, then, if that does not exist, return the table/view
from the current database.
+ *
+ * If the relation is a view, the relation will be wrapped in a
[[SubqueryAlias]] which will
+ * track the name of the view.
*/
def lookupRelation(name: TableIdentifier, alias: Option[String] = None):
LogicalPlan = {
synchronized {
val db = formatDatabaseName(name.database.getOrElse(currentDb))
val table = formatTableName(name.table)
- val relation =
- if (name.database.isDefined || !tempTables.contains(table)) {
- val metadata = externalCatalog.getTable(db, table)
- SimpleCatalogRelation(db, metadata)
- } else {
- tempTables(table)
+ val relationAlias = alias.getOrElse(table)
+ if (name.database.isDefined || !tempTables.contains(table)) {
+ val metadata = externalCatalog.getTable(db, table)
+ val view = Option(metadata.tableType).collect {
--- End diff --
we are too conservative here, `CatalogTable.tableType` should never be
null, and we use this assumption in a lot of places.
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