+ - Added 'CALL' to the list of SQL keywords which return
- Oracle get_default_schema_name() "normalizes" the name
before returning, meaning it returns a lower-case name
when the identifier is detected as case insensitive.
creating/dropping tables takes schema name into account
+ - reating/dropping tables takes schema name into account
when searching for the existing table, so that tables
in other owner namespaces with the same name do not