diff options
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/fdwhandler.sgml | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/doc/src/sgml/fdwhandler.sgml b/doc/src/sgml/fdwhandler.sgml index 4c410c79168..1533a6bf80c 100644 --- a/doc/src/sgml/fdwhandler.sgml +++ b/doc/src/sgml/fdwhandler.sgml @@ -1136,6 +1136,15 @@ GetForeignServerByName(const char *name, bool missing_ok); </para> <para> + Any clauses removed from the plan node's qual list must instead be added + to <literal>fdw_recheck_quals</> in order to ensure correct behavior + at the <literal>READ COMMITTED</> isolation level. When a concurrent + update occurs for some other table involved in the query, the executor + may need to verify that all of the original quals are still satisfied for + the tuple, possibly against a different set of parameter values. + </para> + + <para> Another <structname>ForeignScan</> field that can be filled by FDWs is <structfield>fdw_scan_tlist</>, which describes the tuples returned by the FDW for this plan node. For simple foreign table scans this can be |