holdenk commented on a change in pull request #20658: [SPARK-23488][python] Add
missing catalog methods to python API
URL: https://github.com/apache/spark/pull/20658#discussion_r304011185
##########
File path: python/pyspark/sql/catalog.py
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@@ -138,6 +139,78 @@ def listColumns(self, tableName, dbName=None):
isBucket=jcolumn.isBucket()))
return columns
+ @ignore_unicode_prefix
+ @since(3.0)
+ def databaseExists(self, dbName):
+ """Check if the database with the specified name exists."""
+ return self._jcatalog.databaseExists(dbName)
+
+ @ignore_unicode_prefix
+ @since(3.0)
+ def functionExists(self, functionName, dbName=None):
+ """Check if the function with the specified name exists.
+
+ If no database is specified, the current database is used.
+ """
+ if dbName is None:
+ dbName = self.currentDatabase()
+ return self._jcatalog.functionExists(dbName, functionName)
+
+ @ignore_unicode_prefix
+ @since(3.0)
+ def tableExists(self, tableName, dbName=None):
Review comment:
Same comment, I don't think matching the Scala API is necessarily the right
thing to do here. I think this more closely matches Python developers
expectations of positional arguments behaviour.
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