pgsql: Tidy up the populate/to_record{set} code for json a bit.

Tidy up the populate/to_record{set} code for json a bit.

In the process fix a small bug.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/fbc3def8620953cf124aac65e7be4821f138c37f

Modified Files
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src/backend/utils/adt/jsonfuncs.c | 54 +++++++++++++------------------------
1 file changed, 18 insertions(+), 36 deletions(-)

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