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Commit922c4c4

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Revert: Allow table AM to store complex data structures in rd_amcache
This commit reverts02eb07e per review by Andres Freund.Discussion:https://postgr.es/m/20240410165236.rwyrny7ihi4ddxw4%40awork3.anarazel.de
1 parent8dd0bb8 commit922c4c4

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4 files changed

+12
-44
lines changed

4 files changed

+12
-44
lines changed

‎src/backend/access/heap/heapam_handler.c

Lines changed: 0 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2656,7 +2656,6 @@ static const TableAmRoutine heapam_methods = {
26562656
.index_validate_scan=heapam_index_validate_scan,
26572657
.relation_analyze=heapam_analyze,
26582658

2659-
.free_rd_amcache=NULL,
26602659
.relation_size=table_block_relation_size,
26612660
.relation_needs_toast_table=heapam_relation_needs_toast_table,
26622661
.relation_toast_am=heapam_relation_toast_am,

‎src/backend/utils/cache/relcache.c

Lines changed: 8 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -2269,7 +2269,9 @@ RelationReloadIndexInfo(Relation relation)
22692269
RelationCloseSmgr(relation);
22702270

22712271
/* Must free any AM cached data upon relcache flush */
2272-
table_free_rd_amcache(relation);
2272+
if (relation->rd_amcache)
2273+
pfree(relation->rd_amcache);
2274+
relation->rd_amcache=NULL;
22732275

22742276
/*
22752277
* If it's a shared index, we might be called before backend startup has
@@ -2489,7 +2491,8 @@ RelationDestroyRelation(Relation relation, bool remember_tupdesc)
24892491
pfree(relation->rd_options);
24902492
if (relation->rd_indextuple)
24912493
pfree(relation->rd_indextuple);
2492-
table_free_rd_amcache(relation);
2494+
if (relation->rd_amcache)
2495+
pfree(relation->rd_amcache);
24932496
if (relation->rd_fdwroutine)
24942497
pfree(relation->rd_fdwroutine);
24952498
if (relation->rd_indexcxt)
@@ -2551,7 +2554,9 @@ RelationClearRelation(Relation relation, bool rebuild)
25512554
RelationCloseSmgr(relation);
25522555

25532556
/* Free AM cached data, if any */
2554-
table_free_rd_amcache(relation);
2557+
if (relation->rd_amcache)
2558+
pfree(relation->rd_amcache);
2559+
relation->rd_amcache=NULL;
25552560

25562561
/*
25572562
* Treat nailed-in system relations separately, they always need to be

‎src/include/access/tableam.h

Lines changed: 0 additions & 34 deletions
Original file line numberDiff line numberDiff line change
@@ -687,14 +687,6 @@ typedef struct TableAmRoutine
687687
* ------------------------------------------------------------------------
688688
*/
689689

690-
/*
691-
* This callback frees relation private cache data stored in rd_amcache.
692-
* After the call all memory related to rd_amcache must be freed,
693-
* rd_amcache must be set to NULL. If this callback is not provided,
694-
* rd_amcache is assumed to point to a single memory chunk.
695-
*/
696-
void(*free_rd_amcache) (Relationrel);
697-
698690
/*
699691
* See table_relation_size().
700692
*
@@ -1816,32 +1808,6 @@ table_relation_analyze(Relation relation, AcquireSampleRowsFunc *func,
18161808
* ----------------------------------------------------------------------------
18171809
*/
18181810

1819-
/*
1820-
* Frees relation private cache data stored in rd_amcache. Uses
1821-
* free_rd_amcache method if provided. Assumes rd_amcache to point to single
1822-
* memory chunk otherwise.
1823-
*/
1824-
staticinlinevoid
1825-
table_free_rd_amcache(Relationrel)
1826-
{
1827-
if (rel->rd_tableam&&rel->rd_tableam->free_rd_amcache)
1828-
{
1829-
rel->rd_tableam->free_rd_amcache(rel);
1830-
1831-
/*
1832-
* We are assuming free_rd_amcache() did clear the cache and left NULL
1833-
* in rd_amcache.
1834-
*/
1835-
Assert(rel->rd_amcache==NULL);
1836-
}
1837-
else
1838-
{
1839-
if (rel->rd_amcache)
1840-
pfree(rel->rd_amcache);
1841-
rel->rd_amcache=NULL;
1842-
}
1843-
}
1844-
18451811
/*
18461812
* Return the current size of `rel` in bytes. If `forkNumber` is
18471813
* InvalidForkNumber, return the relation's overall size, otherwise the size

‎src/include/utils/rel.h

Lines changed: 4 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -221,12 +221,10 @@ typedef struct RelationData
221221
* rd_amcache is available for index and table AMs to cache private data
222222
* about the relation. This must be just a cache since it may get reset
223223
* at any time (in particular, it will get reset by a relcache inval
224-
* message for the relation). If used for table AM it must point to a
225-
* single memory chunk palloc'd in CacheMemoryContext, or more complex
226-
* data structure in that memory context to be freed by free_rd_amcache
227-
* method. If used for index AM it must point to a single memory chunk
228-
* palloc'd in rd_indexcxt memory context. A relcache reset will include
229-
* freeing that chunk and setting rd_amcache = NULL.
224+
* message for the relation). If used, it must point to a single memory
225+
* chunk palloc'd in CacheMemoryContext, or in rd_indexcxt for an index
226+
* relation. A relcache reset will include freeing that chunk and setting
227+
* rd_amcache = NULL.
230228
*/
231229
void*rd_amcache;/* available for use by index/table AM */
232230

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