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Add 'ignore_nulls' option to row_to_json

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Provide an option to skip NULL values in a row when generating a JSON
object from that row with row_to_json.  This can reduce the size of the
JSON object in cases where columns are NULL without really reducing the
information in the JSON object.

This also makes row_to_json into a single function with default values,
rather than having multiple functions.  In passing, change array_to_json
to also be a single function with default values (we don't add an
'ignore_nulls' option yet- it's not clear that there is a sensible
use-case there, and it hasn't been asked for in any case).

Pavel Stehule
This commit is contained in:
Stephen Frost
2014-09-11 21:23:51 -04:00
parent c3c75fcd7a
commit 95d737ff45
8 changed files with 118 additions and 51 deletions
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6
doc/src/sgml/func.sgml
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@ -10309,11 +10309,13 @@ table2-mapping
</row>
<row>
<entry>
<literal>row_to_json(record [, pretty_bool])</literal>
<literal>row_to_json(rowval record [, pretty bool [, ignore_nulls bool] ])</literal>
</entry>
<entry>
Returns the row as a JSON object. Line feeds will be added between
level-1 elements if <parameter>pretty_bool</parameter> is true.
level-1 elements if <parameter>pretty_bool</parameter> is true. Elements
with NULL values will be skipped when <parameter>ignore_nulls</parameter>
is true.
</entry>
<entry><literal>row_to_json(row(1,'foo'))</literal></entry>
<entry><literal>{"f1":1,"f2":"foo"}</literal></entry>