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| author | Peter Eisentraut <peter@eisentraut.org> | 2024-09-10 09:51:55 +0200 |
|---|---|---|
| committer | Peter Eisentraut <peter@eisentraut.org> | 2024-09-10 10:03:23 +0200 |
| commit | 56fead44dcc70df9f9188fee08e5aefe3da43ccc (patch) | |
| tree | e7b2c776e4d5f2727403d19c16066d6ffb28a741 /src/include/access/amapi.h | |
| parent | f5050f795aea67dfc40bbc429c8934e9439e22e7 (diff) | |
| download | postgresql-56fead44dcc70df9f9188fee08e5aefe3da43ccc.tar.gz postgresql-56fead44dcc70df9f9188fee08e5aefe3da43ccc.zip | |
Add amgettreeheight index AM API routine
The only current implementation is for btree where it calls
_bt_getrootheight(). Other index types can now also use this to pass
information to their amcostestimate routine. Previously, btree was
hardcoded and other index types could not hook into the optimizer at
this point.
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 'src/include/access/amapi.h')
| -rw-r--r-- | src/include/access/amapi.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/include/access/amapi.h b/src/include/access/amapi.h index f25c9d58a7d..c51de742ea0 100644 --- a/src/include/access/amapi.h +++ b/src/include/access/amapi.h @@ -140,6 +140,13 @@ typedef void (*amcostestimate_function) (struct PlannerInfo *root, double *indexCorrelation, double *indexPages); +/* estimate height of a tree-structured index + * + * XXX This just computes a value that is later used by amcostestimate. This + * API could be expanded to support passing more values if the need arises. + */ +typedef int (*amgettreeheight_function) (Relation rel); + /* parse index reloptions */ typedef bytea *(*amoptions_function) (Datum reloptions, bool validate); @@ -272,6 +279,7 @@ typedef struct IndexAmRoutine amvacuumcleanup_function amvacuumcleanup; amcanreturn_function amcanreturn; /* can be NULL */ amcostestimate_function amcostestimate; + amgettreeheight_function amgettreeheight; /* can be NULL */ amoptions_function amoptions; amproperty_function amproperty; /* can be NULL */ ambuildphasename_function ambuildphasename; /* can be NULL */ |