diff options
Diffstat (limited to 'src/backend/utils/adt/selfuncs.c')
| -rw-r--r-- | src/backend/utils/adt/selfuncs.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/backend/utils/adt/selfuncs.c b/src/backend/utils/adt/selfuncs.c index 1c480cfaaf7..e5e066a5537 100644 --- a/src/backend/utils/adt/selfuncs.c +++ b/src/backend/utils/adt/selfuncs.c @@ -1528,6 +1528,17 @@ boolvarsel(PlannerInfo *root, Node *arg, int varRelid) selec = var_eq_const(&vardata, BooleanEqualOperator, InvalidOid, BoolGetDatum(true), false, true, false); } + else if (is_funcclause(arg)) + { + /* + * If we have no stats and it's a function call, estimate 0.3333333. + * This seems a pretty unprincipled choice, but Postgres has been + * using that estimate for function calls since 1992. The hoariness + * of this behavior suggests that we should not be in too much hurry + * to use another value. + */ + selec = 0.3333333; + } else { /* Otherwise, the default estimate is 0.5 */ |