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doc: clarify handling of range upper/lower/upper_inf/lower_inf()

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Clarify handling of infinite range bounds.

Reported-by: jani.rahkola@iki.fi

Discussion: https://postgr.es/m/160508672127.25505.8356390205508789564@wrigleys.postgresql.org

Co-authored-by: Laurenz Albe

Backpatch-through: 16
This commit is contained in:
Bruce Momjian
2023-11-13 16:08:01 -05:00
parent e72821ca08
commit 17d490ef32
1 changed files with 12 additions and 8 deletions
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20
doc/src/sgml/func.sgml
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@ -19683,7 +19683,7 @@ SELECT NULLIF(value, '(none)') ...
</para>
<para>
Extracts the lower bound of the range (<literal>NULL</literal> if the
range is empty or the lower bound is infinite).
range is empty or has no lower bound).
</para>
<para>
<literal>lower(numrange(1.1,2.2))</literal>
@ -19701,7 +19701,7 @@ SELECT NULLIF(value, '(none)') ...
</para>
<para>
Extracts the upper bound of the range (<literal>NULL</literal> if the
range is empty or the upper bound is infinite).
range is empty or has no upper bound).
</para>
<para>
<literal>upper(numrange(1.1,2.2))</literal>
@ -19769,7 +19769,8 @@ SELECT NULLIF(value, '(none)') ...
<returnvalue>boolean</returnvalue>
</para>
<para>
Is the range's lower bound infinite?
Does the range have no lower bound? (A lower bound of
<literal>-Infinity</literal> returns false.)
</para>
<para>
<literal>lower_inf('(,)'::daterange)</literal>
@ -19786,7 +19787,8 @@ SELECT NULLIF(value, '(none)') ...
<returnvalue>boolean</returnvalue>
</para>
<para>
Is the range's upper bound infinite?
Does the range have no upper bound? (An upper bound of
<literal>Infinity</literal> returns false.)
</para>
<para>
<literal>upper_inf('(,)'::daterange)</literal>
@ -19841,7 +19843,7 @@ SELECT NULLIF(value, '(none)') ...
</para>
<para>
Extracts the lower bound of the multirange (<literal>NULL</literal> if the
multirange is empty or the lower bound is infinite).
multirange is empty has no lower bound).
</para>
<para>
<literal>lower('{[1.1,2.2)}'::nummultirange)</literal>
@ -19859,7 +19861,7 @@ SELECT NULLIF(value, '(none)') ...
</para>
<para>
Extracts the upper bound of the multirange (<literal>NULL</literal> if the
multirange is empty or the upper bound is infinite).
multirange is empty or has no upper bound).
</para>
<para>
<literal>upper('{[1.1,2.2)}'::nummultirange)</literal>
@ -19927,7 +19929,8 @@ SELECT NULLIF(value, '(none)') ...
<returnvalue>boolean</returnvalue>
</para>
<para>
Is the multirange's lower bound infinite?
Does the multirange have no lower bound? (A lower bound of
<literal>-Infinity</literal> returns false.)
</para>
<para>
<literal>lower_inf('{(,)}'::datemultirange)</literal>
@ -19944,7 +19947,8 @@ SELECT NULLIF(value, '(none)') ...
<returnvalue>boolean</returnvalue>
</para>
<para>
Is the multirange's upper bound infinite?
Does the multirange have no upper bound? (An upper bound of
<literal>Infinity</literal> returns false.)
</para>
<para>
<literal>upper_inf('{(,)}'::datemultirange)</literal>