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Provide a way block-level table AMs could re-use acquire_sample_rows()

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While keeping API the same, this commit provides a way for block-level table
AMs to re-use existing acquire_sample_rows() by providing custom callbacks
for getting the next block and the next tuple.

Reported-by: Andres Freund
Discussion: https://postgr.es/m/20240407214001.jgpg5q3yv33ve6y3%40awork3.anarazel.de
Reviewed-by: Pavel Borisov
This commit is contained in:
Alexander Korotkov
2024-04-08 14:30:30 +03:00
parent df64c81ca9
commit dd1f6b0c17
5 changed files with 106 additions and 19 deletions
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13
src/include/access/tableam.h
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@ -1020,6 +1020,19 @@ table_beginscan_tid(Relation rel, Snapshot snapshot)
return rel->rd_tableam->scan_begin(rel, snapshot, 0, NULL, NULL, flags);
}
/*
* table_beginscan_analyze is an alternative entry point for setting up a
* TableScanDesc for an ANALYZE scan. As with bitmap scans, it's worth using
* the same data structure although the behavior is rather different.
*/
static inline TableScanDesc
table_beginscan_analyze(Relation rel)
{
uint32 flags = SO_TYPE_ANALYZE;
return rel->rd_tableam->scan_begin(rel, NULL, 0, NULL, NULL, flags);
}
/*
* End relation scan.
*/