diff options
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/fdwhandler.sgml | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/doc/src/sgml/fdwhandler.sgml b/doc/src/sgml/fdwhandler.sgml index 6587678af2b..1e997c218b9 100644 --- a/doc/src/sgml/fdwhandler.sgml +++ b/doc/src/sgml/fdwhandler.sgml @@ -123,6 +123,14 @@ GetForeignRelSize(PlannerInfo *root, should be replaced if at all possible. The function may also choose to update <literal>baserel->width</literal> if it can compute a better estimate of the average result row width. + (The initial value is based on column data types and on column + average-width values measured by the last <command>ANALYZE</command>.) + Also, this function may update <literal>baserel->tuples</literal> if + it can compute a better estimate of the foreign table's total row count. + (The initial value is + from <structname>pg_class</structname>.<structfield>reltuples</structfield> + which represents the total row count seen by the + last <command>ANALYZE</command>.) </para> <para> |