diff options
| author | Robert Haas <rhaas@postgresql.org> | 2017-03-08 08:02:03 -0500 |
|---|---|---|
| committer | Robert Haas <rhaas@postgresql.org> | 2017-03-08 08:09:38 -0500 |
| commit | 98e6e89040a0534ca26914c66cae9dd49ef62ad9 (patch) | |
| tree | bbdb09553c7418c5c03eeec92849472cb42990fd /src/backend/executor | |
| parent | b7fa016d68b51bc385b75f9d5cffef79e5671981 (diff) | |
| download | postgresql-98e6e89040a0534ca26914c66cae9dd49ef62ad9.tar.gz postgresql-98e6e89040a0534ca26914c66cae9dd49ef62ad9.zip | |
tidbitmap: Support shared iteration.
When a shared iterator is used, each call to tbm_shared_iterate()
returns a result that has not yet been returned to any process
attached to the shared iterator. In other words, each cooperating
processes gets a disjoint subset of the full result set, but all
results are returned exactly once.
This is infrastructure for parallel bitmap heap scan.
Dilip Kumar. The larger patch set of which this is a part has been
reviewed and tested by (at least) Andres Freund, Amit Khandekar,
Tushar Ahuja, Rafia Sabih, Haribabu Kommi, and Thomas Munro.
Discussion: http://postgr.es/m/CAFiTN-uc4=0WxRGfCzs-xfkMYcSEWUC-Fon6thkJGjkh9i=13A@mail.gmail.com
Diffstat (limited to 'src/backend/executor')
| -rw-r--r-- | src/backend/executor/nodeBitmapIndexscan.c | 2 | ||||
| -rw-r--r-- | src/backend/executor/nodeBitmapOr.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/src/backend/executor/nodeBitmapIndexscan.c b/src/backend/executor/nodeBitmapIndexscan.c index 4274e9abcb5..94bb289f1bb 100644 --- a/src/backend/executor/nodeBitmapIndexscan.c +++ b/src/backend/executor/nodeBitmapIndexscan.c @@ -78,7 +78,7 @@ MultiExecBitmapIndexScan(BitmapIndexScanState *node) else { /* XXX should we use less than work_mem for this? */ - tbm = tbm_create(work_mem * 1024L); + tbm = tbm_create(work_mem * 1024L, NULL); } /* diff --git a/src/backend/executor/nodeBitmapOr.c b/src/backend/executor/nodeBitmapOr.c index 3c6155b7c3e..1d280beddc1 100644 --- a/src/backend/executor/nodeBitmapOr.c +++ b/src/backend/executor/nodeBitmapOr.c @@ -129,7 +129,7 @@ MultiExecBitmapOr(BitmapOrState *node) if (result == NULL) /* first subplan */ { /* XXX should we use less than work_mem for this? */ - result = tbm_create(work_mem * 1024L); + result = tbm_create(work_mem * 1024L, NULL); } ((BitmapIndexScanState *) subnode)->biss_result = result; |