about the datetime issue: as far as I know, JSON does not define a serialization format for dates and timestamps.

On the other hand, YAML (as a superset of JSON) already supports a language-independent date(time) serialization format (http://yaml.org/type/timestamp.html).

I haven't had a glance into the SQL/JSON standard yet and a quick search didn't reveal anything. However, reading your test case here https://github.com/postgrespro/sqljson/blob/5a8a241/src/test/regress/sql/sql_json.sql#L411 it seems as if you intend to parse all strings in the form of "YYYY-MM-DD" as dates. This is problematic in case a string happens to look like this but is not intended to be a date.

Just for the sake of completeness: YAML solves this issue by omitting the quotation marks around the date string (just as JSON integers have no quotations marks around them).


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