Horton

BUG #19524: NaN handling in btree_gist's float4/float8 opclasses

Bill Kim <billkimjh@gmail.com>

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From: Bill Kim <billkimjh@gmail.com>
To: pgsql-bugs@lists.postgresql.org
Date: 2026-06-28T02:14:35Z
Lists: pgsql-bugs 
 Hi all,

  I have a patch for this and `make check` passes (core + all contrib, plus
  new btree_gist NaN cases covering the three scenarios in the report).
  Posting here first in case someone is already further along — if not,
  I'll send it to pgsql-hackers and register it in the open CF in a couple
  of days.

  The fix swaps the five gbt_float{4,8}{gt,ge,eq,le,lt} comparators and
  gbt_float{4,8}key_cmp for the NaN-aware float{4,8}_* helpers and
  float{4,8}_cmp_internal() from utils/float.h — same total order the
  btree opclass already uses. No on-disk change.

  Bill

Commits

  1. btree_gist: fix NaN handling in float4/float8 opclasses.