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Show more detail in heapam rmgr descriptions.

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Add helper functions that output arrays in a standard format, and use
the functions inside heapdesc routines.  This allows tools like
pg_walinspect to show a detailed description of the page offset number
arrays for records like PRUNE and VACUUM (unless there was an FPI).

Also document the conventions that desc routines should follow.  Only
the heapdesc routines follow the conventions for now, so they're just
guidelines for the time being.

Based on a suggestion from Andres Freund.

Author: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-By: Peter Geoghegan <pg@bowt.ie>
Discussion: https://postgr.es/m/flat/20230109215842.fktuhesvayno6o4g%40awork3.anarazel.de
This commit is contained in:
Peter Geoghegan
2023-04-07 16:08:52 -07:00
parent 76c111a7f1
commit 7d8219a444
7 changed files with 247 additions and 40 deletions
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22
src/include/access/rmgrdesc_utils.h Normal file
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/*-------------------------------------------------------------------------
*
* rmgrdesc_utils.h
* Support functions for rmgrdesc routines
*
* Copyright (c) 2023, PostgreSQL Global Development Group
*
* src/include/access/rmgrdesc_utils.h
*
*-------------------------------------------------------------------------
*/
#ifndef RMGRDESC_UTILS_H_
#define RMGRDESC_UTILS_H_
extern void array_desc(StringInfo buf, void *array, size_t elem_size, int count,
void (*elem_desc) (StringInfo buf, void *elem, void *data),
void *data);
extern void offset_elem_desc(StringInfo buf, void *offset, void *data);
extern void redirect_elem_desc(StringInfo buf, void *offset, void *data);
extern void relid_desc(StringInfo buf, void *relid, void *data);
#endif /* RMGRDESC_UTILS_H */