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Fix bogus affix-merging code.

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NISortAffixes() compared successive compound affixes incorrectly,
thus possibly failing to merge identical affixes, or (less likely)
merging ones that shouldn't be merged.  The user-visible effects
of this are unclear, to me anyway.

Per bug #15150 from Alexander Lakhin.  It's been broken for a long time,
so back-patch to all supported branches.

Arthur Zakirov

Discussion: https://postgr.es/m/152353327780.31225.13445405496721177988@wrigleys.postgresql.org
This commit is contained in:
Tom Lane 2018-04-12 18:39:51 -04:00
parent b8ca984b2c
commit 65a69dfa08
1 changed files with 4 additions and 2 deletions
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6
src/backend/tsearch/spell.c
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@ -1963,8 +1963,10 @@ NISortAffixes(IspellDict *Conf)
if ((Affix->flagflags & FF_COMPOUNDFLAG) && Affix->replen > 0 &&
isAffixInUse(Conf, Affix->flag))
{
bool issuffix = (Affix->type == FF_SUFFIX);
if (ptr == Conf->CompoundAffix ||
ptr->issuffix != (ptr - 1)->issuffix ||
issuffix != (ptr - 1)->issuffix ||
strbncmp((const unsigned char *) (ptr - 1)->affix,
(const unsigned char *) Affix->repl,
(ptr - 1)->len))
@ -1972,7 +1974,7 @@ NISortAffixes(IspellDict *Conf)
/* leave only unique and minimals suffixes */
ptr->affix = Affix->repl;
ptr->len = Affix->replen;
ptr->issuffix = (Affix->type == FF_SUFFIX);
ptr->issuffix = issuffix;
ptr++;
}
}