diff options
| author | Teodor Sigaev | 2005-06-01 11:45:03 +0000 |
|---|---|---|
| committer | Teodor Sigaev | 2005-06-01 11:45:03 +0000 |
| commit | 7148de1fa89c1a7ef4613ddfca730711335132ef (patch) | |
| tree | 597c34cca5960775656014b29048de5aca1c2787 /contrib/tsearch2 | |
| parent | a91fa3902863489bf8f73881543baa0eb59f2683 (diff) | |
Prevent to divide by zero and range out of 0..1
Diffstat (limited to 'contrib/tsearch2')
| -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 a58986e474..046b062b97 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 */ @@ -609,10 +611,11 @@ 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 */ |