huaxingao commented on a change in pull request #30473:
URL: https://github.com/apache/spark/pull/30473#discussion_r532375082
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/jdbc/JDBCTableCatalog.scala
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@@ -170,6 +174,125 @@ class JDBCTableCatalog extends TableCatalog with Logging {
}
}
+ override def namespaceExists(namespace: Array[String]): Boolean = namespace
match {
+ case Array(db) =>
+ listNamespaces.exists (_(0) == db)
+ case _ => false
+ }
+
+ override def listNamespaces(): Array[Array[String]] = {
+ withConnection { conn =>
+ val catalogs = conn.getMetaData.getCatalogs()
Review comment:
Sorry for the late reply. I was OoO last week.
Yes, it connects to the current database, which is specified in the
connection url.
For example:
```postgres``` in
```jdbc:postgresql://127.0.0.1:5432/postgres;user=testUser;password=testPass```
or ```testdb0``` in
```jdbc:h2:mem:testdb0;user=testUser;password=testPass```
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