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Add array_remove() and array_replace() functions.

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These functions support removing or replacing array element value(s)
matching a given search value.  Although intended mainly to support a
future array-foreign-key feature, they seem useful in their own right.

Marco Nenciarini and Gabriele Bartolini, reviewed by Alex Hunsaker
This commit is contained in:
Tom Lane
2012-07-11 13:59:35 -04:00
parent f9951252db
commit 84a42560c8
7 changed files with 415 additions and 1 deletions
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29
doc/src/sgml/func.sgml
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@ -10316,6 +10316,12 @@ SELECT NULLIF(value, '(none)') ...
<indexterm>
<primary>array_prepend</primary>
</indexterm>
<indexterm>
<primary>array_remove</primary>
</indexterm>
<indexterm>
<primary>array_replace</primary>
</indexterm>
<indexterm>
<primary>array_to_string</primary>
</indexterm>
@ -10432,6 +10438,29 @@ SELECT NULLIF(value, '(none)') ...
<entry><literal>array_prepend(1, ARRAY[2,3])</literal></entry>
<entry><literal>{1,2,3}</literal></entry>
</row>
<row>
<entry>
<literal>
<function>array_remove</function>(<type>anyarray</type>, <type>anyelement</type>)
</literal>
</entry>
<entry><type>anyarray</type></entry>
<entry>remove all elements equal to the given value from the array
(array must be one-dimensional)</entry>
<entry><literal>array_remove(ARRAY[1,2,3,2], 2)</literal></entry>
<entry><literal>{1,3}</literal></entry>
</row>
<row>
<entry>
<literal>
<function>array_replace</function>(<type>anyarray</type>, <type>anyelement</type>, <type>anyelement</type>)
</literal>
</entry>
<entry><type>anyarray</type></entry>
<entry>replace each array element equal to the given value with a new value</entry>
<entry><literal>array_replace(ARRAY[1,2,5,4], 5, 3)</literal></entry>
<entry><literal>{1,2,3,4}</literal></entry>
</row>
<row>
<entry>
<literal>