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Add to pageinspect function to make t_infomask/t_infomask2 human-readable

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Flags of t_infomask and t_infomask2 for each tuple are already included
in the information returned by heap_page_items as integers, and we
lacked a way to make that information human-readable.

Per discussion, the function includes an option which controls if
combined flags should be decomposed or not.  The default is false, to
not decompose combined flags.

The module is bumped to version 1.8.

Author: Craig Ringer, Sawada Masahiko
Reviewed-by: Peter Geoghegan, Robert Haas, Álvaro Herrera, Moon Insung,
Amit Kapila, Michael Paquier, Tomas Vondra
Discussion: https://postgr.es/m/CAMsr+YEY7jeaXOb+oX+RhDyOFuTMdmHjGsBxL=igCm03J0go9Q@mail.gmail.com
This commit is contained in:
Michael Paquier
2019-09-12 15:06:00 +09:00
parent aafe2762b1
commit ddbd5d8731
7 changed files with 389 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

109
contrib/pageinspect/heapfuncs.c
View File

@ -33,6 +33,7 @@
#include "catalog/pg_am_d.h"
#include "catalog/pg_type.h"
#include "miscadmin.h"
#include "port/pg_bitutils.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/rel.h"
@ -494,3 +495,111 @@ tuple_data_split(PG_FUNCTION_ARGS)
PG_RETURN_ARRAYTYPE_P(res);
}
/*
* heap_tuple_infomask_flags
*
* Decode into a human-readable format t_infomask and t_infomask2 associated
* to a tuple. All the flags are described in access/htup_details.h.
*/
PG_FUNCTION_INFO_V1(heap_tuple_infomask_flags);
Datum
heap_tuple_infomask_flags(PG_FUNCTION_ARGS)
{
uint16 t_infomask = PG_GETARG_INT16(0);
uint16 t_infomask2 = PG_GETARG_INT16(1);
bool decode_combined = PG_GETARG_BOOL(2);
int cnt = 0;
ArrayType *a;
int bitcnt;
Datum *d;
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("must be superuser to use raw page functions")));
bitcnt = pg_popcount((const char *) &t_infomask, sizeof(uint16)) +
pg_popcount((const char *) &t_infomask2, sizeof(uint16));
/* If no flags, return an empty array */
if (bitcnt <= 0)
PG_RETURN_POINTER(construct_empty_array(TEXTOID));
d = (Datum *) palloc0(sizeof(Datum) * bitcnt);
/* decode t_infomask */
if ((t_infomask & HEAP_HASNULL) != 0)
d[cnt++] = CStringGetTextDatum("HEAP_HASNULL");
if ((t_infomask & HEAP_HASVARWIDTH) != 0)
d[cnt++] = CStringGetTextDatum("HEAP_HASVARWIDTH");
if ((t_infomask & HEAP_HASEXTERNAL) != 0)
d[cnt++] = CStringGetTextDatum("HEAP_HASEXTERNAL");
if ((t_infomask & HEAP_HASOID_OLD) != 0)
d[cnt++] = CStringGetTextDatum("HEAP_HASOID_OLD");
if ((t_infomask & HEAP_COMBOCID) != 0)
d[cnt++] = CStringGetTextDatum("HEAP_COMBOCID");
if ((t_infomask & HEAP_XMAX_COMMITTED) != 0)
d[cnt++] = CStringGetTextDatum("HEAP_XMAX_COMMITTED");
if ((t_infomask & HEAP_XMAX_INVALID) != 0)
d[cnt++] = CStringGetTextDatum("HEAP_XMAX_INVALID");
if ((t_infomask & HEAP_UPDATED) != 0)
d[cnt++] = CStringGetTextDatum("HEAP_UPDATED");
/* decode combined masks of t_infomaks */
if (decode_combined && (t_infomask & HEAP_XMAX_SHR_LOCK) != 0)
d[cnt++] = CStringGetTextDatum("HEAP_XMAX_SHR_LOCK");
else
{
if ((t_infomask & HEAP_XMAX_EXCL_LOCK) != 0)
d[cnt++] = CStringGetTextDatum("HEAP_XMAX_EXCL_LOCK");
if ((t_infomask & HEAP_XMAX_KEYSHR_LOCK) != 0)
d[cnt++] = CStringGetTextDatum("HEAP_XMAX_KEYSHR_LOCK");
}
if (decode_combined && (t_infomask & HEAP_XMIN_FROZEN) != 0)
d[cnt++] = CStringGetTextDatum("HEAP_XMIN_FROZEN");
else
{
if ((t_infomask & HEAP_XMIN_COMMITTED) != 0)
d[cnt++] = CStringGetTextDatum("HEAP_XMIN_COMMITTED");
if ((t_infomask & HEAP_XMIN_INVALID) != 0)
d[cnt++] = CStringGetTextDatum("HEAP_XMIN_INVALID");
}
if (decode_combined && (t_infomask & HEAP_MOVED) != 0)
d[cnt++] = CStringGetTextDatum("HEAP_MOVED");
else
{
if ((t_infomask & HEAP_MOVED_IN) != 0)
d[cnt++] = CStringGetTextDatum("HEAP_MOVED_IN");
if ((t_infomask & HEAP_MOVED_OFF) != 0)
d[cnt++] = CStringGetTextDatum("HEAP_MOVED_OFF");
}
if (decode_combined && HEAP_LOCKED_UPGRADED(t_infomask))
d[cnt++] = CStringGetTextDatum("HEAP_LOCKED_UPGRADED");
else
{
if (HEAP_XMAX_IS_LOCKED_ONLY(t_infomask))
d[cnt++] = CStringGetTextDatum("HEAP_XMAX_LOCK_ONLY");
if ((t_infomask & HEAP_XMAX_IS_MULTI) != 0)
d[cnt++] = CStringGetTextDatum("HEAP_XMAX_IS_MULTI");
}
/* decode t_infomask2 */
if ((t_infomask2 & HEAP_KEYS_UPDATED) != 0)
d[cnt++] = CStringGetTextDatum("HEAP_KEYS_UPDATED");
if ((t_infomask2 & HEAP_HOT_UPDATED) != 0)
d[cnt++] = CStringGetTextDatum("HEAP_HOT_UPDATED");
if ((t_infomask2 & HEAP_ONLY_TUPLE) != 0)
d[cnt++] = CStringGetTextDatum("HEAP_ONLY_TUPLE");
Assert(cnt <= bitcnt);
a = construct_array(d, cnt, TEXTOID, -1, false, 'i');
pfree(d);
PG_RETURN_POINTER(a);
}