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Fix default minimum value for descending sequences 

For some reason that is lost in history, a descending sequence would
default its minimum value to -2^63+1 (-PG_INT64_MAX) instead of
-2^63 (PG_INT64_MIN), even though explicitly specifying a minimum value
of -2^63 would work.  Fix this inconsistency by using the full range by
default.

Reported-by: Daniel Verite <daniel@manitou-mail.org>
Reviewed-by: Michael Paquier <michael.paquier@gmail.com>
This commit is contained in:
Peter Eisentraut 2017-01-23 14:00:58 -05:00
parent 46d482814c
commit 0bc1207aeb
4 changed files with 5 additions and 11 deletions
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2
doc/src/sgml/ref/create_sequence.sgml
View File

@ -133,7 +133,7 @@ SELECT * FROM <replaceable>name</replaceable>;
the minimum value a sequence can generate. If this clause is not
supplied or <option>NO MINVALUE</option> is specified, then
defaults will be used. The defaults are 1 and
-2<superscript>63</>-1 for ascending and descending sequences,
-2<superscript>63</> for ascending and descending sequences,
respectively.
</para>
</listitem>

4
src/backend/commands/sequence.c
View File

@ -1353,7 +1353,7 @@ init_params(ParseState *pstate, List *options, bool isInit,
else if (isInit || max_value != NULL)
{
if (seqform->seqincrement > 0)
seqform->seqmax = SEQ_MAXVALUE; /* ascending seq */
seqform->seqmax = PG_INT64_MAX; /* ascending seq */
else
seqform->seqmax = -1; /* descending seq */
seqdataform->log_cnt = 0;
@ -1370,7 +1370,7 @@ init_params(ParseState *pstate, List *options, bool isInit,
if (seqform->seqincrement > 0)
seqform->seqmin = 1; /* ascending seq */
else
seqform->seqmin = SEQ_MINVALUE; /* descending seq */
seqform->seqmin = PG_INT64_MIN; /* descending seq */
seqdataform->log_cnt = 0;
}

4
src/bin/pg_dump/pg_dump.c
View File

@ -15876,8 +15876,8 @@ dumpSequence(Archive *fout, TableInfo *tbinfo)
/* Make sure we are in proper schema */
selectSourceSchema(fout, tbinfo->dobj.namespace->dobj.name);
snprintf(bufm, sizeof(bufm), INT64_FORMAT, SEQ_MINVALUE);
snprintf(bufx, sizeof(bufx), INT64_FORMAT, SEQ_MAXVALUE);
snprintf(bufm, sizeof(bufm), INT64_FORMAT, PG_INT64_MIN);
snprintf(bufx, sizeof(bufx), INT64_FORMAT, PG_INT64_MAX);
if (fout->remoteVersion >= 100000)
{

6
src/include/pg_config_manual.h
View File

@ -50,12 +50,6 @@
*/
#define PARTITION_MAX_KEYS 32
/*
* Set the upper and lower bounds of sequence values.
*/
#define SEQ_MAXVALUE PG_INT64_MAX
#define SEQ_MINVALUE (-SEQ_MAXVALUE)
/*
* When we don't have native spinlocks, we use semaphores to simulate them.
* Decreasing this value reduces consumption of OS resources; increasing it