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tableam: Provide helper functions for relation sizing.

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Most block-based table AMs will need the exact same implementation of
the relation_size callback as the heap, and if they use a standard
page layout, they will likely need an implementation of the
relation_estimate_size callback that is very similar to that of the
heap.  Rearrange to facilitate code reuse.

Patch by me, reviewed by Michael Paquier, Daniel Gustafsson, and
Álvaro Herrera.

Discussion: http://postgr.es/m/CA+TgmoZ6DBPnP1E-vRpQZUJQijJFD54F+SR_pxGiAAS-MyrigA@mail.gmail.com
This commit is contained in:
Robert Haas
2019-07-08 14:51:53 -04:00
parent 482501d433
commit 554106b116
3 changed files with 185 additions and 119 deletions
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14
src/include/access/tableam.h
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@@ -1727,6 +1727,20 @@ extern void table_block_parallelscan_startblock_init(Relation rel,
ParallelBlockTableScanDesc pbscan);
/* ----------------------------------------------------------------------------
* Helper functions to implement relation sizing for block oriented AMs.
* ----------------------------------------------------------------------------
*/
extern uint64 table_block_relation_size(Relation rel, ForkNumber forkNumber);
extern void table_block_relation_estimate_size(Relation rel,
int32 *attr_widths,
BlockNumber *pages,
double *tuples,
double *allvisfrac,
Size overhead_bytes_per_tuple,
Size usable_bytes_per_page);
/* ----------------------------------------------------------------------------
* Functions in tableamapi.c
* ----------------------------------------------------------------------------