DirectNetezzaManager's checkTable method fails to find table and it will error out and returns something like:
"<table_name> is not a valid Netezza table"
The cause is the query to look for netezza table (QUERY_CHECK_DICTIONARY_FOR_TABLE) is case-sensitive. To query for tables in Netezza catalog this needs to be case-insensitive.
Older netezza installs have system catalog tables stored in lowercase 'table', while more recent Netezza have 'TABLE' by default.
Based on the feedback from Netezza admins, the query recommended to check for tables in _V_TABLES system catalog (instead of _V_OBJECTS) table.