Re: Fw:Re: Fw: gbt_var_consistent in contrib/btree_gist/btree_utils_var.c has internal-node type confusion on the <> strategy, bypassing exclusion constraints

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Ayush Tiwari
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Re: Fw:Re: Fw: gbt_var_consistent in contrib/btree_gist/btree_utils_var.c has internal-node type confusion on the <> strategy, bypassing exclusion constraints
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в 19:48:13
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CAJTYsWUvzzik7uW-ZeqDELdpZV8ZxxfO4yx0_B8j1-8ndzgsGQ@mail.gmail.com
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Re: Fw:Re: Fw: gbt_var_consistent in contrib/btree_gist/btree_utils_var.c has internal-node type confusion on the <> strategy, bypassing exclusion constraints Ayush Tiwari <ayushtiwari.slg01@gmail.com>
Hi,

On Fri, 3 Jul 2026 at 19:20, Tom Lane <tgl@sss.pgh.pa.us> wrote:
Ayush Tiwari <ayushtiwari.slg01@gmail.com> writes:
> Are you planning on including it in the backpatch or to keep the
> optimization just part of master, and the bug fix backpatched?

I was intending to back-patch only the bug fixes, ie 0002 and 0003.
If we make additional cosmetic changes to gbt_var_consistent(),
I could go either way on whether to include those in the back-patch.

Sounds good.
 
BTW, thinking some more about 0004: isn't it pointless to check
gbt_var_node_pf_match in the gbt_var_consistent cases that
only constrain the lower bound, that is LessEqual and Less?  In

                retval = tinfo->f_cmp(query, key->lower, collation, flinfo) >= 0
                    || gbt_var_node_pf_match(key, query, tinfo);

if query >= key->lower then we must search the node, but if it
isn't then the prefix match against upper can't succeed either. 

Hmm, looks like the || gbt_var_node_pf_match(...) clause isn't
needed in the BTLessStrategyNumber and BTLessEqualStrategyNumber
cases.  Those only compare against the lower bound, and if query
sorts before lower then it sorts before upper too, so a prefix
match against the (truncated) upper can never succeed there.
I tried changing it locally and ran the regression tests, all passed.

Regards,
Ayush
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