Clean up comments regarding to GUC temp_tablespaces
Original comments is regarding to merging upstream Postgres commit https://github.com/postgres/postgres/commit/acfce502#diff-82589fcf3640eac3ba54e51e998ec6f5. There are two parts controled by this GUC `temp_tablespaces`: - temporary file location - temporary table location If there are more than one tablespace described in this GUC, a random one will be chosen. In GPDB, we already provide `filespace`, and using the `gpfilespace --movetempfilespace`, user can set temp file location. However, GPDB doesn't have an easy way to create temp tables on different tablespaces. It is valuable to add this feature in GPDB to honor the GUC `temp_tablespaces` partially to change the temporary table location, but need significant validations to ensure correctness like permissions, etc. Signed-off-by: NXin Zhang <xzhang@pivotal.io>
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