diff options
| author | Teodor Sigaev | 2005-06-01 11:46:09 +0000 |
|---|---|---|
| committer | Teodor Sigaev | 2005-06-01 11:46:09 +0000 |
| commit | 1891938e9c7765cb59515483576b2e07f508e385 (patch) | |
| tree | f5ec33c4c130a0bec77f05bac3f345570fb9e576 /contrib | |
| parent | 5205024b5a61a2c6e66748df909c38976ab0895a (diff) | |
Prevent to divide by zero and range out of 0..1
Diffstat (limited to 'contrib')
| -rw-r--r-- | contrib/tsearch2/rank.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/contrib/tsearch2/rank.c b/contrib/tsearch2/rank.c index c6cbd1c9591..9098cc9ed60 100644 --- a/contrib/tsearch2/rank.c +++ b/contrib/tsearch2/rank.c @@ -288,6 +288,7 @@ calc_rank(float *w, tsvector * t, QUERYTYPE * q, int4 method) { ITEM *item = GETQUERY(q); float res = 0.0; + int len; if (!t->size || !q->size) return 0.0; @@ -303,10 +304,11 @@ calc_rank(float *w, tsvector * t, QUERYTYPE * q, int4 method) case 0: break; case 1: - res /= log((float) cnt_length(t)); + res /= log( (float)(cnt_length(t)+1) ) / log(2.0); break; case 2: - res /= (float) cnt_length(t); + len = cnt_length(t); + if ( len > 0 ) res /= (float)len; break; default: /* internal error */ @@ -607,10 +609,11 @@ rank_cd(PG_FUNCTION_ARGS) case 0: break; case 1: - res /= log((float) cnt_length(txt)); + res /= log( (float)(cnt_length(txt)+1) ); break; case 2: - res /= (float) cnt_length(txt); + len = cnt_length(txt); + if ( len > 0 ) res /= (float)len; break; default: /* internal error */ |