heyihong commented on code in PR #43959:
URL: https://github.com/apache/spark/pull/43959#discussion_r1403357813
##########
sql/core/src/main/scala/org/apache/spark/sql/internal/CatalogImpl.scala:
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@@ -516,18 +516,11 @@ class CatalogImpl(sparkSession: SparkSession) extends
Catalog {
* Checks if the database with the specified name exists.
*/
override def databaseExists(dbName: String): Boolean = {
- // To maintain backwards compatibility, we first treat the input is a
simple dbName and check
- // if sessionCatalog contains it. If no, we try to parse it, resolve
catalog and namespace,
- // and check if namespace exists in the catalog.
- if (!sessionCatalog.databaseExists(dbName)) {
- val plan = UnresolvedNamespace(parseIdent(dbName))
- sparkSession.sessionState.executePlan(plan).analyzed match {
- case ResolvedNamespace(catalog: SupportsNamespaces, ns) =>
- catalog.namespaceExists(ns.toArray)
- case _ => true
- }
- } else {
- true
+ val plan =
DescribeNamespace(UnresolvedNamespace(resolveNamespace(dbName)), false)
+ sparkSession.sessionState.executePlan(plan).analyzed match {
+ case DescribeNamespace(ResolvedNamespace(catalog: SupportsNamespaces,
ns), _, _) =>
+ catalog.namespaceExists(ns.toArray)
Review Comment:
It is because
https://github.com/apache/spark/blob/9c21238ce0e6bec676213f4bad4bc1bf4ac16932/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/ResolveCatalogs.scala#L67-L68
only checks whether Catalog exists if I understand correctly
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