Re: Add jsonb_compact(...) for whitespace-free jsonb to text

It'd be nice to have a stable text representation of a jsonb value with minimal whitespace. The latter would also save a few bytes per record in text output formats, on the wire, and in backups (ex: COPY ... TO STDOUT).

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Attached is a *very* work in progress patch that adds a jsonb_compact(jsonb)::text function. It generates a text representation without extra whitespace but does not yet try to enforce a stable order of the properties within a jsonb value.