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Like the similar logic for arrays and records, it's necessary to examine the range's subtype to decide whether the range type can support hashing. We can omit checking the subtype for btree-defined operations, though, since range subtypes are required to have those operations. (Possibly that simplification for btree cases led us to overlook that it does not apply for hash cases.) This is only an issue if the subtype lacks hash support, which is not true of any built-in range type, but it's easy to demonstrate a problem with a range type over, eg, money: you can get a "could not identify a hash function" failure when the planner is misled into thinking that hash join or aggregation would work. This was born broken, so back-patch to all supported branches. |
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| data | ||
| expected | ||
| input | ||
| output | ||
| sql | ||
| .gitignore | ||
| GNUmakefile | ||
| Makefile | ||
| parallel_schedule | ||
| pg_regress_main.c | ||
| pg_regress.c | ||
| pg_regress.h | ||
| README | ||
| regress.c | ||
| regressplans.sh | ||
| resultmap | ||
| serial_schedule | ||
| standby_schedule | ||
Documentation concerning how to run these regression tests and interpret the results can be found in the PostgreSQL manual, in the chapter "Regression Tests".