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Re: Extract numeric filed in JSONB more effectively - Mailing list pgsql-hackers

From Andy Fan
Subject Re: Extract numeric filed in JSONB more effectively
Date
Msg-id CAKU4AWp+KLes8g=BWLqZfDmW9+=ZY0UC4G0i3qVcYEviK_dDTA@mail.gmail.com
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In response to Re: Extract numeric filed in JSONB more effectively  (Tom Lane <tgl@sss.pgh.pa.us>)
Responses Re: Extract numeric filed in JSONB more effectively
Re: Extract numeric filed in JSONB more effectively
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We'd still have functions like jsonb_field_as_numeric() under the
hood, but there's not an expectation that users call them explicitly.

To avoid the lots of functions like jsonb_field_as_int2/int4, I defined
Datum jsonb_object_field_type(.., Oid target_oid) at last,  so the
function must return "internal" or "anyelement".  Then we can see:

select jsonb_object_field_type(tb.a, 'a'::text, 1700) from tb;
ERROR:  cannot display a value of type anyelement.

The reason is clear to me, but  I'm not sure how to fix that or deserves
a fix? Or shall I define jsonb_object_field_int2/int8 to avoid this? 

This is an unresolved issue at the latest patch. 
--
Best Regards
Andy Fan

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