Add ALTER OPERATOR command, for changing selectivity estimator functions.
Heikki Linnakangas <heikki.linnakangas@iki.fi>
Add ALTER OPERATOR command, for changing selectivity estimator functions. Other options cannot be changed, as it's not totally clear if cached plans would need to be invalidated if one of the other options change. Selectivity estimator functions only change plan costs, not correctness of plans, so those should be safe. Original patch by Uriy Zhuravlev, heavily edited by me.
Files
| Path | Change | +/− |
|---|---|---|
| doc/src/sgml/ref/alter_operator.sgml | modified | +32 −2 |
| src/backend/commands/operatorcmds.c | modified | +242 −59 |
| src/backend/nodes/copyfuncs.c | modified | +15 −0 |
| src/backend/nodes/equalfuncs.c | modified | +13 −0 |
| src/backend/parser/gram.y | modified | +31 −3 |
| src/backend/tcop/utility.c | modified | +9 −0 |
| src/include/commands/defrem.h | modified | +1 −0 |
| src/include/nodes/nodes.h | modified | +1 −0 |
| src/include/nodes/parsenodes.h | modified | +13 −0 |
| src/test/regress/expected/alter_operator.out | added | +76 −0 |
| src/test/regress/parallel_schedule | modified | +1 −1 |
| src/test/regress/serial_schedule | modified | +1 −0 |
| src/test/regress/sql/alter_operator.sql | added | +64 −0 |