lvector_table_info
Signature:
CREATE FUNCTION lvector_table_info(table_name LVARCHAR);
Purpose: Returns metadata for a lvector table.
Example:
EXECUTE FUNCTION lvector_table_info('docs_demo');
Note: Expected fields include table_name, version, row_count, and
index_count. If index_count stays 0 after index creation, the index did not complete
successfully.