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The SQL grammar has been extended to support a new way of specifying the table name for SQL queries as follows. Originally, the grammar was to use the keyword cttbl, which was rather obscure and not self-explanatory as other SQL keywords are. This keyword name has been changed from cttbl to fileset so the syntax is as follows:
table_ref ::
table_name [ AS ] [ alias [ ( column_alias [ , ... ] ) ] ]
| ( query_expression ) [ AS ] alias [ ( column_alias [ , ... ] ) ]
| [ ( ] joined_table [ ) ]
| fileset(table_name [,"file_list"])[ AS ] [ alias [ ( column_alias [ , ... ] ) ] ]
