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Commit466dac8

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Fix make_greater_string to not have an undocumented collation assumption.
The previous coding worked only if ltproc->fn_collation was always eitherDEFAULT_COLLATION_OID or a C-compatible locale. While that's true at themoment, it wasn't documented (and in fact wasn't true when this code wascommitted...). But it only takes a couple more lines to make its internalcaching behavior locale-aware, so let's do that.
1 parentcdcdfca commit466dac8

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‎src/backend/utils/adt/selfuncs.c

Lines changed: 8 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -5436,7 +5436,8 @@ pattern_selectivity(Const *patt, Pattern_Type ptype)
54365436
* in the form of a Const node; else return NULL.
54375437
*
54385438
* The caller must provide the appropriate "less than" comparison function
5439-
* for testing the strings.
5439+
* for testing the strings. In particular, ltproc->fn_collation specifies
5440+
* the locale for comparisons.
54405441
*
54415442
* The key requirement here is that given a prefix string, say "foo",
54425443
* we must be able to generate another string "fop" that is greater than
@@ -5504,19 +5505,21 @@ make_greater_string(const Const *str_const, FmgrInfo *ltproc)
55045505
{
55055506
/* If first time through, determine the suffix to use */
55065507
staticcharsuffixchar=0;
5508+
staticOidsuffixcollation=0;
55075509

5508-
if (!suffixchar)
5510+
if (!suffixchar||suffixcollation!=ltproc->fn_collation)
55095511
{
55105512
char*best;
55115513

55125514
best="Z";
5513-
if (varstr_cmp(best,1,"z",1,DEFAULT_COLLATION_OID)<0)
5515+
if (varstr_cmp(best,1,"z",1,ltproc->fn_collation)<0)
55145516
best="z";
5515-
if (varstr_cmp(best,1,"y",1,DEFAULT_COLLATION_OID)<0)
5517+
if (varstr_cmp(best,1,"y",1,ltproc->fn_collation)<0)
55165518
best="y";
5517-
if (varstr_cmp(best,1,"9",1,DEFAULT_COLLATION_OID)<0)
5519+
if (varstr_cmp(best,1,"9",1,ltproc->fn_collation)<0)
55185520
best="9";
55195521
suffixchar=*best;
5522+
suffixcollation=ltproc->fn_collation;
55205523
}
55215524

55225525
/* And build the string to compare to */

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