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Check if relation has storage in calculate_relation_size #566

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merged 1 commit into from
Jan 24, 2025
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Check if relation has storage in calculate_relation_size #566

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13 changes: 12 additions & 1 deletion src/backend/utils/adt/dbsize.c
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Original file line number Diff line number Diff line change
Expand Up @@ -282,7 +282,18 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
static int64
calculate_relation_size(RelFileNode *rfn, BackendId backend, ForkNumber forknum, char relpersistence)
{
SMgrRelation srel = smgropen(*rfn, backend, relpersistence);
SMgrRelation srel;
RelFileNode zero = {0, 0, 0};

/*
* We can get asked the size of a relation without storage, in which case
* we get passed a zero RFL.
* Return 0 for those relations.
*/
if (RelFileNodeEquals(*rfn, zero))
return 0;

srel = smgropen(*rfn, backend, relpersistence);

if (smgrexists(srel, forknum))
{
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