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

Clarify handling of infinite range bounds.Reported-by: jani.rahkola@iki.fiDiscussion:https://postgr.es/m/160508672127.25505.8356390205508789564@wrigleys.postgresql.orgCo-authored-by: Laurenz AlbeBackpatch-through: 16

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doc/src/sgml
- func.sgml

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`‎doc/src/sgml/func.sgml`

Lines changed: 12 additions & 8 deletions

Original file line number	Diff line number	Diff line change
`@@ -19683,7 +19683,7 @@ SELECT NULLIF(value, '(none)') ...`
`19683`	`19683`	`</para>`
`19684`	`19684`	`<para>`
`19685`	`19685`	`Extracts the lower bound of the range (<literal>NULL</literal> if the`
`19686`		`- range is empty orthelower bound is infinite).`
	`19686`	`+ range is empty orhas nolower bound).`
`19687`	`19687`	`</para>`
`19688`	`19688`	`<para>`
`19689`	`19689`	`<literal>lower(numrange(1.1,2.2))</literal>`
`@@ -19701,7 +19701,7 @@ SELECT NULLIF(value, '(none)') ...`
`19701`	`19701`	`</para>`
`19702`	`19702`	`<para>`
`19703`	`19703`	`Extracts the upper bound of the range (<literal>NULL</literal> if the`
`19704`		`- range is empty ortheupper bound is infinite).`
	`19704`	`+ range is empty orhas noupper bound).`
`19705`	`19705`	`</para>`
`19706`	`19706`	`<para>`
`19707`	`19707`	`<literal>upper(numrange(1.1,2.2))</literal>`
`@@ -19769,7 +19769,8 @@ SELECT NULLIF(value, '(none)') ...`
`19769`	`19769`	`<returnvalue>boolean</returnvalue>`
`19770`	`19770`	`</para>`
`19771`	`19771`	`<para>`
`19772`		`- Is the range's lower bound infinite?`
	`19772`	`+ Does the range have no lower bound? (A lower bound of`
	`19773`	`+ <literal>-Infinity</literal> returns false.)`
`19773`	`19774`	`</para>`
`19774`	`19775`	`<para>`
`19775`	`19776`	`<literal>lower_inf('(,)'::daterange)</literal>`
`@@ -19786,7 +19787,8 @@ SELECT NULLIF(value, '(none)') ...`
`19786`	`19787`	`<returnvalue>boolean</returnvalue>`
`19787`	`19788`	`</para>`
`19788`	`19789`	`<para>`
`19789`		`- Is the range's upper bound infinite?`
	`19790`	`+ Does the range have no upper bound? (An upper bound of`
	`19791`	`+ <literal>Infinity</literal> returns false.)`
`19790`	`19792`	`</para>`
`19791`	`19793`	`<para>`
`19792`	`19794`	`<literal>upper_inf('(,)'::daterange)</literal>`
`@@ -19841,7 +19843,7 @@ SELECT NULLIF(value, '(none)') ...`
`19841`	`19843`	`</para>`
`19842`	`19844`	`<para>`
`19843`	`19845`	`Extracts the lower bound of the multirange (<literal>NULL</literal> if the`
`19844`		`- multirange is emptyor the lower bound is infinite).`
	`19846`	`+ multirange is emptyhas no lower bound).`
`19845`	`19847`	`</para>`
`19846`	`19848`	`<para>`
`19847`	`19849`	`<literal>lower('{[1.1,2.2)}'::nummultirange)</literal>`
`@@ -19859,7 +19861,7 @@ SELECT NULLIF(value, '(none)') ...`
`19859`	`19861`	`</para>`
`19860`	`19862`	`<para>`
`19861`	`19863`	`Extracts the upper bound of the multirange (<literal>NULL</literal> if the`
`19862`		`- multirange is empty ortheupper bound is infinite).`
	`19864`	`+ multirange is empty orhas noupper bound).`
`19863`	`19865`	`</para>`
`19864`	`19866`	`<para>`
`19865`	`19867`	`<literal>upper('{[1.1,2.2)}'::nummultirange)</literal>`
`@@ -19927,7 +19929,8 @@ SELECT NULLIF(value, '(none)') ...`
`19927`	`19929`	`<returnvalue>boolean</returnvalue>`
`19928`	`19930`	`</para>`
`19929`	`19931`	`<para>`
`19930`		`- Is the multirange's lower bound infinite?`
	`19932`	`+ Does the multirange have no lower bound? (A lower bound of`
	`19933`	`+ <literal>-Infinity</literal> returns false.)`
`19931`	`19934`	`</para>`
`19932`	`19935`	`<para>`
`19933`	`19936`	`<literal>lower_inf('{(,)}'::datemultirange)</literal>`
`@@ -19944,7 +19947,8 @@ SELECT NULLIF(value, '(none)') ...`
`19944`	`19947`	`<returnvalue>boolean</returnvalue>`
`19945`	`19948`	`</para>`
`19946`	`19949`	`<para>`
`19947`		`- Is the multirange's upper bound infinite?`
	`19950`	`+ Does the multirange have no upper bound? (An upper bound of`
	`19951`	`+ <literal>Infinity</literal> returns false.)`
`19948`	`19952`	`</para>`
`19949`	`19953`	`<para>`
`19950`	`19954`	`<literal>upper_inf('{(,)}'::datemultirange)</literal>`

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`‎doc/src/sgml/func.sgml`

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