HyukjinKwon 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_r245190685
##########
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):
Review comment:
Hm, this signature looks different with Scala side:
```scala
def functionExists(functionName: String): Boolean
def functionExists(dbName: String, functionName: String): Boolean
```
Can we handle this? There're some examples to refer, for instance,
https://github.com/apache/spark/blob/ecaa495b1fe532c36e952ccac42f4715809476af/python/pyspark/sql/dataframe.py#L811-L846
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