Add some documentation.

Author: Diadochokinetic

pandas/io/sql.py

@@ -969,13 +969,17 @@ def __init__(
             raise ValueError("Empty table name specified")
 
     def _drop_temporary_table(self):
+        """Drop a temporary table. Temporary tables are not in a database's meta data
+        and need to be dropped hard coded."""
         if self.schema is None:
             query = f"DROP TABLE {self.name}"
         else:
             query = f"DROP TABLE {self.schema}.{self.name}"
         self.pd_sql.execute(query)
 
     def _exists_temporary(self):
+        """Check if a temporary table exists. Temporary tables are not in a database's
+        meta data. The existence is duck tested by a SELECT statement."""
         from sqlalchemy.exc import (
             OperationalError,
             ProgrammingError,