On 9.16.4. JSON_TABLE
`
name type FORMAT JSON [ENCODING UTF8] [ PATH json_path_specification ]
Inserts a composite SQL/JSON item into the output row
`
i am not sure "Inserts a composite SQL/JSON item into the output row"
I think it means, for any type's typecategory is TYPCATEGORY_STRING,
if FORMAT JSON is specified explicitly, the output value (text type)
will be legal
json type representation.
I also did a minor refactor on JSON_VALUE_OP, jsexpr->omit_quotes.