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Allow json{b}_strip_nulls to remove null array elements

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An additional paramater ("strip_in_arrays") is added to these functions.
It defaults to false. If true, then null array elements are removed as
well as null valued object fields. JSON that just consists of a single
null is not affected.

Author: Florents Tselai <florents.tselai@gmail.com>

Discussion: https://postgr.es/m/4BCECCD5-4F40-4313-9E98-9E16BEB0B01D@gmail.com
This commit is contained in:
Andrew Dunstan
2025-03-05 09:50:34 -05:00
parent 5ead85fbc8
commit 4603903d29
8 changed files with 190 additions and 9 deletions
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17
doc/src/sgml/func.sgml
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@@ -17345,25 +17345,32 @@ ERROR: value too long for type character(2)
<indexterm>
<primary>json_strip_nulls</primary>
</indexterm>
<function>json_strip_nulls</function> ( <type>json</type> )
<function>json_strip_nulls</function> ( <parameter>target</parameter> <type>jsonb</type>, <optional>,<parameter>strip_in_arrays</parameter> <type>boolean</type> </optional> )
<returnvalue>json</returnvalue>
</para>
<para role="func_signature">
<indexterm>
<primary>jsonb_strip_nulls</primary>
</indexterm>
<function>jsonb_strip_nulls</function> ( <type>jsonb</type> )
<function>jsonb_strip_nulls</function> ( <parameter>target</parameter> <type>jsonb</type>, <optional>,<parameter>strip_in_arrays</parameter> <type>boolean</type> </optional> )
<returnvalue>jsonb</returnvalue>
</para>
<para>
Deletes all object fields that have null values from the given JSON
value, recursively. Null values that are not object fields are
untouched.
value, recursively.
If <parameter>strip_in_arrays</parameter> is true (the default is false),
null array elements are also stripped.
Otherwise they are not stripped. Bare null values are never stripped.
</para>
<para>
<literal>json_strip_nulls('[{"f1":1, "f2":null}, 2, null, 3]')</literal>
<returnvalue>[{"f1":1},2,null,3]</returnvalue>
</para></entry>
</para>
<para>
<literal>jsonb_strip_nulls('[1,2,null,3,4]', true);</literal>
<returnvalue>[1,2,3,4]</returnvalue>
</para>
</entry>
</row>
<row>