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| author | Peter Eisentraut <peter@eisentraut.org> | 2025-02-27 17:03:31 +0100 |
|---|---|---|
| committer | Peter Eisentraut <peter@eisentraut.org> | 2025-02-27 17:03:31 +0100 |
| commit | ce62f2f2a0a48d021f250ba84dfcab5d45ddc914 (patch) | |
| tree | dd73a4a521f961961ce8c991363b3425e9e4741d /doc/src | |
| parent | 6eb8a1a4f90c542d7ce9dcc381528fcb81390ab9 (diff) | |
| download | postgresql-ce62f2f2a0a48d021f250ba84dfcab5d45ddc914.tar.gz postgresql-ce62f2f2a0a48d021f250ba84dfcab5d45ddc914.zip | |
Generalize hash and ordering support in amapi
Stop comparing access method OID values against HASH_AM_OID and
BTREE_AM_OID, and instead check the IndexAmRoutine for an index to see
if it advertises its ability to perform the necessary ordering,
hashing, or cross-type comparing functionality. A field amcanorder
already existed, this uses it more widely. Fields amcanhash and
amcancrosscompare are added for the other purposes.
Author: Mark Dilger <mark.dilger@enterprisedb.com>
Discussion: https://www.postgresql.org/message-id/flat/E72EAA49-354D-4C2E-8EB9-255197F55330@enterprisedb.com
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/indexam.sgml | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/src/sgml/indexam.sgml b/doc/src/sgml/indexam.sgml index d17fcbd5cec..c50ba60e21c 100644 --- a/doc/src/sgml/indexam.sgml +++ b/doc/src/sgml/indexam.sgml @@ -103,6 +103,10 @@ typedef struct IndexAmRoutine bool amcanorder; /* does AM support ORDER BY result of an operator on indexed column? */ bool amcanorderbyop; + /* does AM support hashing using API consistent with the hash AM? */ + bool amcanhash; + /* does AM support cross-type comparisons? */ + bool amcancrosscompare; /* does AM support backward scanning? */ bool amcanbackward; /* does AM support UNIQUE indexes? */ |