I wrote an array_to_json function during GSoC 2010: http://git.postgresql.org/gitweb/?p=json-datatype.git;a=blob;f=json_io.c#l289 It's not exposed as a procedure called array_to_json: it's part of the to_json function, which decides what to do based on the argument type. - Joey
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Соглашаюсь с условиями обработки персональных данных