reviewed by Neil Conway. This patch adds the following DDL command
variants: RESET SESSION, RESET TEMP, RESET PLANS, CLOSE ALL, and
DEALLOCATE ALL. RESET SESSION is intended for use by connection
pool software and the like, in order to reset a client session
to something close to its initial state.
Note that while most of these command variants can be executed
inside a transaction block (but are not transaction-aware!),
RESET SESSION cannot. While this is inconsistent, it is intended
to catch programmer mistakes: RESET SESSION in an open transaction
block is probably unintended.
well as vacuum_cost_delay. Since datestyle is a string variable,
this exercises memory allocation issues that might not appear when
modifying an integer GUC variable. Also, we can observe the side
effects of changing datestyle to check that assign hooks are called
at the right times.
Neil Conway
Tom Lane