diff options
Diffstat (limited to 'contrib/pgstattuple/pgstatapprox.c')
| -rw-r--r-- | contrib/pgstattuple/pgstatapprox.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/contrib/pgstattuple/pgstatapprox.c b/contrib/pgstattuple/pgstatapprox.c index ff7c255a2de..d36758af9a6 100644 --- a/contrib/pgstattuple/pgstatapprox.c +++ b/contrib/pgstattuple/pgstatapprox.c @@ -89,6 +89,9 @@ statapprox_heap(Relation rel, output_type *stat) /* * If the page has only visible tuples, then we can find out the free * space from the FSM and move on. + * + * Note: If a relation has no FSM, GetRecordedFreeSpace() will report + * zero free space. This is fine for the purposes of approximation. */ if (VM_ALL_VISIBLE(rel, blkno, &vmbuffer)) { |