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Rework word_similarity documentation, make it close to actual algorithm.

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word_similarity before claimed as returning similarity of closest word in
string, but, actually it returns similarity of substring. Also fix mistyped
comments.

Author: Alexander Korotkov
Review by: David Steele, Liudmila Mantrova
Discussionis:
https://www.postgresql.org/message-id/flat/CY4PR17MB13207ED8310F847CF117EED0D85A0@CY4PR17MB1320.namprd17.prod.outlook.com
https://www.postgresql.org/message-id/flat/f43b242d-000c-f4c8-cb8b-d37e9752cd93%40postgrespro.ru
This commit is contained in:
Teodor Sigaev
2018-03-21 14:37:18 +03:00
parent 8bcdba9a20
commit 5b1b7286c9
2 changed files with 44 additions and 16 deletions
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4
contrib/pg_trgm/trgm_op.c
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@ -456,7 +456,7 @@ iterate_word_similarity(int *trg2indexes,
lastpos[trgindex] = i;
}
/* Adjust lower bound if this trigram is present in required substring */
/* Adjust upper bound if this trigram is present in required substring */
if (found[trgindex])
{
int prev_lower,
@ -473,7 +473,7 @@ iterate_word_similarity(int *trg2indexes,
smlr_cur = CALCSML(count, ulen1, ulen2);
/* Also try to adjust upper bound for greater similarity */
/* Also try to adjust lower bound for greater similarity */
tmp_count = count;
tmp_ulen2 = ulen2;
prev_lower = lower;