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Diffstat (limited to 'src/backend/optimizer/path/costsize.c')
| -rw-r--r-- | src/backend/optimizer/path/costsize.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/src/backend/optimizer/path/costsize.c b/src/backend/optimizer/path/costsize.c index f821b508d6c..348c36b40e3 100644 --- a/src/backend/optimizer/path/costsize.c +++ b/src/backend/optimizer/path/costsize.c @@ -394,9 +394,14 @@ cost_index(IndexPath *path, PlannerInfo *root, if (indexonly) pages_fetched = ceil(pages_fetched * (1.0 - baserel->allvisfrac)); - min_IO_cost = spc_random_page_cost; - if (pages_fetched > 1) - min_IO_cost += (pages_fetched - 1) * spc_seq_page_cost; + if (pages_fetched > 0) + { + min_IO_cost = spc_random_page_cost; + if (pages_fetched > 1) + min_IO_cost += (pages_fetched - 1) * spc_seq_page_cost; + } + else + min_IO_cost = 0; } /* |