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SQL Standard 2016 defines FF1-FF9 format patters for fractions of seconds in jsonpath .datetime() method and CAST (... FORMAT ...) SQL clause. Parsing engine of upcoming .datetime() method will be shared with to_date()/ to_timestamp(). This patch implements FF1-FF6 format patterns for upcoming jsonpath .datetime() method. to_date()/to_timestamp() functions will also get support of this format patterns as positive side effect. FF7-FF9 are not supported due to lack of precision in our internal timestamp representation. Extracted from original patch by Nikita Glukhov, Teodor Sigaev, Oleg Bartunov. Heavily revised by me. Discussion: https://postgr.es/m/fcc6fc6a-b497-f39a-923d-aa34d0c588e8%402ndQuadrant.com Discussion: https://postgr.es/m/CAPpHfdsZgYEra_PeCLGNoXOWYx6iU-S3wF8aX0ObQUcZU%2B4XTw%40mail.gmail.com Author: Nikita Glukhov, Teodor Sigaev, Oleg Bartunov, Alexander Korotkov Reviewed-by: Anastasia Lubennikova, Peter Eisentraut |
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