digoal
2024-01-26
PostgreSQL , PolarDB , DuckDB , jsonpath , SQL feature
Implement various jsonpath methods
author Andrew Dunstan <andrew@dunslane.net>
Thu, 25 Jan 2024 15:15:43 +0000 (10:15 -0500)
committer Andrew Dunstan <andrew@dunslane.net>
Thu, 25 Jan 2024 15:15:43 +0000 (10:15 -0500)
commit 66ea94e8e606529bb334515f388c62314956739e
tree 82bbcc7b7837412ca86df6b3a04e7046f51871e5 tree
parent 924d046dcf55887c98a1628675a30f4b0eebe556 commit | diff
Implement various jsonpath methods
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.
+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
用法举例:
