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Allow table AM to store complex data structures in rd_amcache

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The new table AM method free_rd_amcache is responsible for freeing all the
memory related to rd_amcache and setting free_rd_amcache to NULL.  If the new
method is not specified, we still assume rd_amcache to be a single chunk of
memory, which could be just pfree'd.

Discussion: https://postgr.es/m/CAPpHfdurb9ycV8udYqM%3Do0sPS66PJ4RCBM1g-bBpvzUfogY0EA%40mail.gmail.com
Reviewed-by: Matthias van de Meent, Mark Dilger, Pavel Borisov
Reviewed-by: Nikita Malakhov, Japin Li
This commit is contained in:
Alexander Korotkov
2024-03-21 23:00:34 +02:00
parent 57184c3b5d
commit 02eb07ea89
4 changed files with 44 additions and 12 deletions
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34
src/include/access/tableam.h
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@@ -708,6 +708,14 @@ typedef struct TableAmRoutine
* ------------------------------------------------------------------------
*/
/*
* This callback frees relation private cache data stored in rd_amcache.
* After the call all memory related to rd_amcache must be freed,
* rd_amcache must be set to NULL. If this callback is not provided,
* rd_amcache is assumed to point to a single memory chunk.
*/
void (*free_rd_amcache) (Relation rel);
/*
* See table_relation_size().
*
@@ -1847,6 +1855,32 @@ table_index_validate_scan(Relation table_rel,
* ----------------------------------------------------------------------------
*/
/*
* Frees relation private cache data stored in rd_amcache. Uses
* free_rd_amcache method if provided. Assumes rd_amcache to point to single
* memory chunk otherwise.
*/
static inline void
table_free_rd_amcache(Relation rel)
{
if (rel->rd_tableam && rel->rd_tableam->free_rd_amcache)
{
rel->rd_tableam->free_rd_amcache(rel);
/*
* We are assuming free_rd_amcache() did clear the cache and left NULL
* in rd_amcache.
*/
Assert(rel->rd_amcache == NULL);
}
else
{
if (rel->rd_amcache)
pfree(rel->rd_amcache);
rel->rd_amcache = NULL;
}
}
/*
* Return the current size of `rel` in bytes. If `forkNumber` is
* InvalidForkNumber, return the relation's overall size, otherwise the size