Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/15301#discussion_r81255189
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/catalog/Catalog.scala ---
@@ -102,6 +102,89 @@ abstract class Catalog {
def listColumns(dbName: String, tableName: String): Dataset[Column]
/**
+ * Find the database with the specified name. This throws an
AnalysisException when the database
+ * cannot be found.
+ *
+ * @since 2.1.0
+ */
+ @throws[AnalysisException]("database does not exist")
+ def findDatabase(dbName: String): Database
+
+ /**
+ * Find the table with the specified name. This table can be a temporary
table or a table in the
+ * current database. This throws an AnalysisException when the table
cannot be found.
+ *
+ * @since 2.1.0
+ */
+ @throws[AnalysisException]("table does not exist")
+ def findTable(tableName: String): Table
+
+ /**
+ * Find the table with the specified name in the specified database.
This throws an
+ * AnalysisException when the table cannot be found.
+ *
+ * @since 2.1.0
+ */
+ @throws[AnalysisException]("database or table does not exist")
+ def findTable(dbName: String, tableName: String): Table
+
+ /**
+ * Find the function with the specified name. This function can be a
temporary function or a
+ * function in the current database. This throws an AnalysisException
when the function cannot
+ * be found.
+ *
+ * @since 2.1.0
+ */
+ @throws[AnalysisException]("function does not exist")
+ def findFunction(functionName: String): Function
+
+ /**
+ * Find the function with the specified name. This throws an
AnalysisException when the function
+ * cannot be found.
+ *
+ * @since 2.1.0
+ */
+ @throws[AnalysisException]("database or function does not exist")
+ def findFunction(dbName: String, functionName: String): Function
+
+ /**
+ * Check if the database with the specified name exists.
+ *
+ * @since 2.1.0
+ */
+ def databaseExists(dbName: String): Boolean
+
+ /**
+ * Check if the table with the specified name exists. This can either be
a temporary table or a
+ * table in the current database.
+ *
+ * @since 2.1.0
+ */
+ def tableExists(tableName: String): Boolean
+
+ /**
+ * Check if the table with the specified name exists in the specified
database.
+ *
+ * @since 2.1.0
+ */
+ def tableExists(dbName: String, tableName: String): Boolean
--- End diff --
Yeah, that is for java compatibility.
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