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Implement various jsonpath methods

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This commit implements ithe jsonpath .bigint(), .boolean(),
.date(), .decimal([precision [, scale]]), .integer(), .number(),
.string(), .time(), .time_tz(), .timestamp(), and .timestamp_tz()
methods.

.bigint() converts the given JSON string or a numeric value to
the bigint type representation.

.boolean() converts the given JSON string, numeric, or boolean
value to the boolean type representation.  In the numeric case, only
integers are allowed. We use the parse_bool() backend function
to convert a string to a bool.

.decimal([precision [, scale]]) converts the given JSON string
or a numeric value to the numeric type representation.  If precision
and scale are provided for .decimal(), then it is converted to the
equivalent numeric typmod and applied to the numeric number.

.integer() and .number() convert the given JSON string or a
numeric value to the int4 and numeric type representation.

.string() uses the datatype's output function to convert numeric
and various date/time types to the string representation.

The JSON string representing a valid date/time is converted to the
specific date or time type representation using jsonpath .date(),
.time(), .time_tz(), .timestamp(), .timestamp_tz() methods.  The
changes use the infrastructure of the .datetime() method and perform
the datatype conversion as appropriate.  Unlike the .datetime()
method, none of these methods accept a format template and use ISO
DateTime format instead.  However, except for .date(), the
date/time related methods take an optional precision to adjust the
fractional seconds.

Jeevan Chalke, reviewed by Peter Eisentraut and Andrew Dunstan.
This commit is contained in:
Andrew Dunstan
2024-01-25 10:15:43 -05:00
parent 924d046dcf
commit 66ea94e8e6
11 changed files with 3569 additions and 30 deletions
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28
src/backend/catalog/sql_features.txt
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@@ -574,20 +574,20 @@ T861 SQL/JSON simplified accessor: case-sensitive JSON member accessor NO
T862 SQL/JSON simplified accessor: wildcard member accessor NO
T863 SQL/JSON simplified accessor: single-quoted string literal as member accessor NO
T864 SQL/JSON simplified accessor NO
T865 SQL/JSON item method: bigint() NO
T866 SQL/JSON item method: boolean() NO
T867 SQL/JSON item method: date() NO
T868 SQL/JSON item method: decimal() NO
T869 SQL/JSON item method: decimal() with precision and scale NO
T870 SQL/JSON item method: integer() NO
T871 SQL/JSON item method: number() NO
T872 SQL/JSON item method: string() NO
T873 SQL/JSON item method: time() NO
T874 SQL/JSON item method: time_tz() NO
T875 SQL/JSON item method: time precision NO
T876 SQL/JSON item method: timestamp() NO
T877 SQL/JSON item method: timestamp_tz() NO
T878 SQL/JSON item method: timestamp precision NO
T865 SQL/JSON item method: bigint() YES
T866 SQL/JSON item method: boolean() YES
T867 SQL/JSON item method: date() YES
T868 SQL/JSON item method: decimal() YES
T869 SQL/JSON item method: decimal() with precision and scale YES
T870 SQL/JSON item method: integer() YES
T871 SQL/JSON item method: number() YES
T872 SQL/JSON item method: string() YES
T873 SQL/JSON item method: time() YES
T874 SQL/JSON item method: time_tz() YES
T875 SQL/JSON item method: time precision YES
T876 SQL/JSON item method: timestamp() YES
T877 SQL/JSON item method: timestamp_tz() YES
T878 SQL/JSON item method: timestamp precision YES
T879 JSON in equality operations YES with jsonb
T880 JSON in grouping operations YES with jsonb
T881 JSON in ordering operations NO with jsonb, partially supported