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Commite352a00

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Doc: clarify behavior of standard aggregates for null inputs.
Section 4.2.7 says that unless otherwise specified, built-inaggregates ignore rows in which any input is null. This isnot true of the JSON aggregates, but it wasn't documented.Fix that.Of the other entries in table 9.55, some were explicit aboutignoring nulls, and some weren't; for consistency andself-contained-ness, make them all say it explicitly.Per bug #15884 from Tim Möhlmann. Back-patch to all supportedbranches.Discussion:https://postgr.es/m/15884-c32d848f787fcae3@postgresql.org
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‎doc/src/sgml/func.sgml

Lines changed: 15 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -13513,7 +13513,7 @@ NULL baz</literallayout>(3 rows)</entry>
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<entry>No</entry>
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<entry>input arrays concatenated into array of one higher dimension
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(inputs must all have same dimensionality,
13516-
and cannot be empty orNULL)</entry>
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and cannot be empty ornull)</entry>
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</row>
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<row>
@@ -13537,7 +13537,7 @@ NULL baz</literallayout>(3 rows)</entry>
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otherwise the same as the argument data type
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</entry>
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<entry>Yes</entry>
13540-
<entry>the average (arithmetic mean) of all input values</entry>
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<entry>the average (arithmetic mean) of allnon-nullinput values</entry>
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</row>
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<row>
@@ -13665,7 +13665,7 @@ NULL baz</literallayout>(3 rows)</entry>
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<type>json</type>
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</entry>
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<entry>No</entry>
13668-
<entry>aggregates values as a JSON array</entry>
13668+
<entry>aggregates values, including nulls, as a JSON array</entry>
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</row>
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<row>
@@ -13682,7 +13682,7 @@ NULL baz</literallayout>(3 rows)</entry>
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<type>jsonb</type>
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</entry>
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<entry>No</entry>
13685-
<entry>aggregates values as a JSON array</entry>
13685+
<entry>aggregates values, including nulls, as a JSON array</entry>
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</row>
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<row>
@@ -13699,7 +13699,8 @@ NULL baz</literallayout>(3 rows)</entry>
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<type>json</type>
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</entry>
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<entry>No</entry>
13702-
<entry>aggregates name/value pairs as a JSON object</entry>
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<entry>aggregates name/value pairs as a JSON object; values can be
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null, but not names</entry>
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</row>
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<row>
@@ -13716,7 +13717,8 @@ NULL baz</literallayout>(3 rows)</entry>
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<type>jsonb</type>
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</entry>
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<entry>No</entry>
13719-
<entry>aggregates name/value pairs as a JSON object</entry>
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<entry>aggregates name/value pairs as a JSON object; values can be
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null, but not names</entry>
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</row>
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<row>
@@ -13732,7 +13734,7 @@ NULL baz</literallayout>(3 rows)</entry>
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<entry>Yes</entry>
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<entry>
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maximum value of <replaceable
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class="parameter">expression</replaceable> across all input
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class="parameter">expression</replaceable> across allnon-nullinput
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values
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</entry>
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</row>
@@ -13750,7 +13752,7 @@ NULL baz</literallayout>(3 rows)</entry>
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<entry>Yes</entry>
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<entry>
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minimum value of <replaceable
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class="parameter">expression</replaceable> across all input
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class="parameter">expression</replaceable> across allnon-nullinput
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values
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</entry>
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</row>
@@ -13772,7 +13774,7 @@ NULL baz</literallayout>(3 rows)</entry>
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same as argument types
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</entry>
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<entry>No</entry>
13775-
<entry>input values concatenated into a string, separated by delimiter</entry>
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<entry>non-nullinput values concatenated into a string, separated by delimiter</entry>
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</row>
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<row>
@@ -13795,7 +13797,8 @@ NULL baz</literallayout>(3 rows)</entry>
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argument data type
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</entry>
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<entry>Yes</entry>
13798-
<entry>sum of <replaceable class="parameter">expression</replaceable> across all input values</entry>
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<entry>sum of <replaceable class="parameter">expression</replaceable>
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across all non-null input values</entry>
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</row>
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<row>
@@ -13812,7 +13815,8 @@ NULL baz</literallayout>(3 rows)</entry>
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<type>xml</type>
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</entry>
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<entry>No</entry>
13815-
<entry>concatenation of XML values (see also <xref linkend="functions-xml-xmlagg"/>)</entry>
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<entry>concatenation of non-null XML values
13819+
(see also <xref linkend="functions-xml-xmlagg"/>)</entry>
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</row>
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</tbody>
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</tgroup>

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