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| author | Alexander Korotkov <akorotkov@postgresql.org> | 2019-03-10 11:36:47 +0300 |
|---|---|---|
| committer | Alexander Korotkov <akorotkov@postgresql.org> | 2019-03-10 11:37:17 +0300 |
| commit | f2e403803fe6deb8cff59ea09dff42c6163b2110 (patch) | |
| tree | 1c3afef6e11f6498002b88219d9644e71bb5972d /src/include/access/gist_private.h | |
| parent | a0b762626884b3b949c2703abb1c4b42fbbdfdc6 (diff) | |
| download | postgresql-f2e403803fe6deb8cff59ea09dff42c6163b2110.tar.gz postgresql-f2e403803fe6deb8cff59ea09dff42c6163b2110.zip | |
Support for INCLUDE attributes in GiST indexes
Similarly to B-tree, GiST index access method gets support of INCLUDE
attributes. These attributes aren't used for tree navigation and aren't
present in non-leaf pages. But they are present in leaf pages and can be
fetched during index-only scan.
The point of having INCLUDE attributes in GiST indexes is slightly different
from the point of having them in B-tree. The main point of INCLUDE attributes
in B-tree is to define UNIQUE constraint over part of attributes enabled for
index-only scan. In GiST the main point of INCLUDE attributes is to use
index-only scan for attributes, whose data types don't have GiST opclasses.
Discussion: https://postgr.es/m/73A1A452-AD5F-40D4-BD61-978622FF75C1%40yandex-team.ru
Author: Andrey Borodin, with small changes by me
Reviewed-by: Andreas Karlsson
Diffstat (limited to 'src/include/access/gist_private.h')
| -rw-r--r-- | src/include/access/gist_private.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/include/access/gist_private.h b/src/include/access/gist_private.h index 3698942f9da..463d2bfc7b9 100644 --- a/src/include/access/gist_private.h +++ b/src/include/access/gist_private.h @@ -78,7 +78,9 @@ typedef struct GISTSTATE MemoryContext scanCxt; /* context for scan-lifespan data */ MemoryContext tempCxt; /* short-term context for calling functions */ - TupleDesc tupdesc; /* index's tuple descriptor */ + TupleDesc leafTupdesc; /* index's tuple descriptor */ + TupleDesc nonLeafTupdesc; /* truncated tuple descriptor for non-leaf + * pages */ TupleDesc fetchTupdesc; /* tuple descriptor for tuples returned in an * index-only scan */ |