diff options
Diffstat (limited to 'contrib/postgres_fdw/postgres_fdw.c')
| -rw-r--r-- | contrib/postgres_fdw/postgres_fdw.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/contrib/postgres_fdw/postgres_fdw.c b/contrib/postgres_fdw/postgres_fdw.c index c590f374c67..e201b5404e6 100644 --- a/contrib/postgres_fdw/postgres_fdw.c +++ b/contrib/postgres_fdw/postgres_fdw.c @@ -5835,7 +5835,10 @@ merge_fdw_options(PgFdwRelationInfo *fpinfo, /* * We'll prefer to consider this join async-capable if any table from - * either side of the join is considered async-capable. + * either side of the join is considered async-capable. This would be + * reasonable because in that case the foreign server would have its + * own resources to scan that table asynchronously, and the join could + * also be computed asynchronously using the resources. */ fpinfo->async_capable = fpinfo_o->async_capable || fpinfo_i->async_capable; @@ -6893,6 +6896,9 @@ produce_tuple_asynchronously(AsyncRequest *areq, bool fetch) /* * Begin an asynchronous data fetch. * + * Note: this function assumes there is no currently-in-progress asynchronous + * data fetch. + * * Note: fetch_more_data must be called to fetch the result. */ static void |