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Clarify documentation of ceil/ceiling/floor functions. 

Document these as "nearest integer >= argument" and "nearest integer <=
argument", which will hopefully be less confusing than the old formulation.
New wording is from Matlab via Dean Rasheed.

I changed the pg_description entries as well as the SGML docs.  In the
back branches, this will only affect installations initdb'd in the future,
but it should be harmless otherwise.

Discussion: <CAEZATCW3yzJo-NMSiQs5jXNFbTsCEftZS-Og8=FvFdiU+kYuSA@mail.gmail.com>
This commit is contained in:
Tom Lane 2016-06-09 11:58:00 -04:00
parent 5b3cd1a771
commit 719dd9a64a
2 changed files with 9 additions and 9 deletions
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6
doc/src/sgml/func.sgml
View File

@ -659,7 +659,7 @@
<literal><function>ceil(<type>dp</type> or <type>numeric</type>)</function></literal>
</entry>
<entry>(same as input)</entry>
<entry>smallest integer not less than argument</entry>
<entry>nearest integer greater than or equal to argument</entry>
<entry><literal>ceil(-42.8)</literal></entry>
<entry><literal>-42</literal></entry>
</row>
@ -672,7 +672,7 @@
<literal><function>ceiling(<type>dp</type> or <type>numeric</type>)</function></literal>
</entry>
<entry>(same as input)</entry>
<entry>smallest integer not less than argument (alias for <function>ceil</function>)</entry>
<entry>nearest integer greater than or equal to argument (same as <function>ceil</function>)</entry>
<entry><literal>ceiling(-95.3)</literal></entry>
<entry><literal>-95</literal></entry>
</row>
@ -725,7 +725,7 @@
<literal><function>floor(<type>dp</type> or <type>numeric</type>)</function></literal>
</entry>
<entry>(same as input)</entry>
<entry>largest integer not greater than argument</entry>
<entry>nearest integer less than or equal to argument</entry>
<entry><literal>floor(-42.8)</literal></entry>
<entry><literal>-43</literal></entry>
</row>

12
src/include/catalog/pg_proc.h
View File

@ -411,11 +411,11 @@ DESCR("round to nearest integer");
DATA(insert OID = 229 ( dtrunc PGNSP PGUID 12 1 0 0 0 f f f f t f i 1 0 701 "701" _null_ _null_ _null_ _null_ _null_ dtrunc _null_ _null_ _null_ ));
DESCR("truncate to integer");
DATA(insert OID = 2308 ( ceil PGNSP PGUID 12 1 0 0 0 f f f f t f i 1 0 701 "701" _null_ _null_ _null_ _null_ _null_ dceil _null_ _null_ _null_ ));
DESCR("smallest integer >= value");
DESCR("nearest integer >= value");
DATA(insert OID = 2320 ( ceiling PGNSP PGUID 12 1 0 0 0 f f f f t f i 1 0 701 "701" _null_ _null_ _null_ _null_ _null_ dceil _null_ _null_ _null_ ));
DESCR("smallest integer >= value");
DESCR("nearest integer >= value");
DATA(insert OID = 2309 ( floor PGNSP PGUID 12 1 0 0 0 f f f f t f i 1 0 701 "701" _null_ _null_ _null_ _null_ _null_ dfloor _null_ _null_ _null_ ));
DESCR("largest integer <= value");
DESCR("nearest integer <= value");
DATA(insert OID = 2310 ( sign PGNSP PGUID 12 1 0 0 0 f f f f t f i 1 0 701 "701" _null_ _null_ _null_ _null_ _null_ dsign _null_ _null_ _null_ ));
DESCR("sign of value");
DATA(insert OID = 230 ( dsqrt PGNSP PGUID 12 1 0 0 0 f f f f t f i 1 0 701 "701" _null_ _null_ _null_ _null_ _null_ dsqrt _null_ _null_ _null_ ));
@ -2318,11 +2318,11 @@ DESCR("value truncated to 'scale'");
DATA(insert OID = 1710 ( trunc PGNSP PGUID 14 1 0 0 0 f f f f t f i 1 0 1700 "1700" _null_ _null_ _null_ _null_ _null_ "select pg_catalog.trunc($1,0)" _null_ _null_ _null_ ));
DESCR("value truncated to 'scale' of zero");
DATA(insert OID = 1711 ( ceil PGNSP PGUID 12 1 0 0 0 f f f f t f i 1 0 1700 "1700" _null_ _null_ _null_ _null_ _null_ numeric_ceil _null_ _null_ _null_ ));
DESCR("smallest integer >= value");
DESCR("nearest integer >= value");
DATA(insert OID = 2167 ( ceiling PGNSP PGUID 12 1 0 0 0 f f f f t f i 1 0 1700 "1700" _null_ _null_ _null_ _null_ _null_ numeric_ceil _null_ _null_ _null_ ));
DESCR("smallest integer >= value");
DESCR("nearest integer >= value");
DATA(insert OID = 1712 ( floor PGNSP PGUID 12 1 0 0 0 f f f f t f i 1 0 1700 "1700" _null_ _null_ _null_ _null_ _null_ numeric_floor _null_ _null_ _null_ ));
DESCR("largest integer <= value");
DESCR("nearest integer <= value");
DATA(insert OID = 1718 ( numeric_eq PGNSP PGUID 12 1 0 0 0 f f f f t f i 2 0 16 "1700 1700" _null_ _null_ _null_ _null_ _null_ numeric_eq _null_ _null_ _null_ ));
DATA(insert OID = 1719 ( numeric_ne PGNSP PGUID 12 1 0 0 0 f f f f t f i 2 0 16 "1700 1700" _null_ _null_ _null_ _null_ _null_ numeric_ne _null_ _null_ _null_ ));
DATA(insert OID = 1720 ( numeric_gt PGNSP PGUID 12 1 0 0 0 f f f f t f i 2 0 16 "1700 1700" _null_ _null_ _null_ _null_ _null_ numeric_gt _null_ _null_ _null_ ));