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Custom reloptions for table AM

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Let table AM define custom reloptions for its tables.  This allows to
specify AM-specific parameters by WITH clause when creating a table.

The code may use some parts from prior work by Hao Wu.

Discussion: https://postgr.es/m/CAPpHfdurb9ycV8udYqM%3Do0sPS66PJ4RCBM1g-bBpvzUfogY0EA%40mail.gmail.com
Discussion: https://postgr.es/m/AMUA1wBBBxfc3tKRLLdU64rb.1.1683276279979.Hmail.wuhao%40hashdata.cn
Reviewed-by: Reviewed-by: Pavel Borisov, Matthias van de Meent
This commit is contained in:
Alexander Korotkov
2024-03-30 22:36:25 +02:00
parent 27bc1772fc
commit c95c25f9af
8 changed files with 126 additions and 27 deletions
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25
src/backend/access/table/tableamapi.c
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@ -13,9 +13,11 @@
#include "access/tableam.h"
#include "access/xact.h"
#include "catalog/pg_am.h"
#include "commands/defrem.h"
#include "miscadmin.h"
#include "utils/guc_hooks.h"
#include "utils/syscache.h"
/*
@ -98,6 +100,29 @@ GetTableAmRoutine(Oid amhandler)
return routine;
}
/*
* GetTableAmRoutineByAmOid
* Given the table access method oid get its TableAmRoutine struct, which
* will be palloc'd in the caller's memory context.
*/
const TableAmRoutine *
GetTableAmRoutineByAmOid(Oid amoid)
{
HeapTuple ht_am;
Form_pg_am amrec;
const TableAmRoutine *tableam = NULL;
ht_am = SearchSysCache1(AMOID, ObjectIdGetDatum(amoid));
if (!HeapTupleIsValid(ht_am))
elog(ERROR, "cache lookup failed for access method %u",
amoid);
amrec = (Form_pg_am) GETSTRUCT(ht_am);
tableam = GetTableAmRoutine(amrec->amhandler);
ReleaseSysCache(ht_am);
return tableam;
}
/* check_hook: validate new default_table_access_method */
bool
check_default_table_access_method(char **newval, void **extra, GucSource source)