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Add planner support functions for range operators <@ and @>.

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These support functions will transform expressions with constant
range values into direct comparisons on the range bound values,
which are frequently better-optimizable.  The transformation is
skipped however if it would require double evaluation of a
volatile or expensive element expression.

Along the way, add the range opfamily OID to range typcache entries,
since load_rangetype_info has to compute that anyway and it seems
silly to duplicate the work later.

Kim Johan Andersson and Jian He, reviewed by Laurenz Albe

Discussion: https://postgr.es/m/94f64d1f-b8c0-b0c5-98bc-0793a34e0851@kimmet.dk
This commit is contained in:
Tom Lane
2024-01-20 13:57:54 -05:00
parent abb0b4fc03
commit 075df6b208
8 changed files with 469 additions and 11 deletions
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1
src/backend/utils/cache/typcache.c vendored
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@@ -940,6 +940,7 @@ load_rangetype_info(TypeCacheEntry *typentry)
/* get opclass properties and look up the comparison function */
opfamilyOid = get_opclass_family(opclassOid);
opcintype = get_opclass_input_type(opclassOid);
typentry->rng_opfamily = opfamilyOid;
cmpFnOid = get_opfamily_proc(opfamilyOid, opcintype, opcintype,
BTORDER_PROC);