branch-4.0: [Feature](function) Support function DEFAULT #57531 #60198
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Return the default value of column
```sql
CREATE TABLE test_default_scalar (
c_id INT,
c_bool BOOLEAN NULL DEFAULT 1,
c_tinyint TINYINT NULL DEFAULT 7,
c_smallint SMALLINT NULL DEFAULT 32000,
c_int INT NULL DEFAULT 2147483647,
c_bigint BIGINT NULL DEFAULT 9223372036854775807,
c_largeint LARGEINT NULL DEFAULT '170141183460469231731687303715884105727',
c_float FLOAT NULL DEFAULT 3.125,
c_double DOUBLE NULL DEFAULT 2.718281828,
c_decimal DECIMAL(27, 9) NULL DEFAULT '123456789.123456789',
c_decimal_compact DECIMAL(18, 4) NULL DEFAULT '99999.1234',
c_pi DOUBLE NULL DEFAULT PI,
c_e DOUBLE NULL DEFAULT E,
c_char CHAR(8) NULL DEFAULT 'charDemo',
c_varchar VARCHAR(32) NULL DEFAULT '',
c_string STRING NULL DEFAULT 'plain string',
c_datetime DATETIME NULL DEFAULT '2025-10-25 11:22:33',
c_date DATE NULL DEFAULT '2025-10-31',
c_json JSON NULL,
c_ipv4 IPV4 NULL DEFAULT '192.168.1.1',
c_ipv6 IPV6 NULL DEFAULT '2001:db8::1',
c_array_int ARRAY<INT> NULL DEFAULT '[]',
c_array_string ARRAY<STRING> NULL,
c_map_str_int MAP<STRING, INT> NULL,
c_struct STRUCT<f1:INT,f2:STRING,f3:BOOLEAN> NULL,
c_variant VARIANT NULL
) PROPERTIES ( 'replication_num' = '1');
SELECT
default(c_id) AS default_id,
default(c_bool) AS default_c_bool,
default(c_tinyint) AS default_c_tinyint,
default(c_smallint) AS default_c_smallint,
default(c_int) AS default_c_int,
default(c_bigint) AS default_c_bigint,
default(c_largeint) AS default_c_largeint,
default(c_float) AS default_c_float,
default(c_double) AS default_c_double,
default(c_decimal) AS default_c_decimal,
default(c_decimal_compact) AS default_c_decimal_compact,
default(c_char) AS default_c_char,
default(c_varchar) AS default_c_varchar,
default(c_string) AS default_c_string,
default(c_datetime) AS default_datetime,
default(c_date) AS defaut_time,
default(c_json) AS default_c_json,
default(c_ipv4) AS default_c_ipv4,
default(c_ipv6) AS default_c_ipv6,
default(c_array_int) AS default_c_array_int,
default(c_array_string) AS default_c_array_string,
default(c_map_str_int) AS default_c_map_str_int,
default(c_struct) AS default_c_struct,
default(c_variant) AS default_c_variant
FROM test_default_scalar
LIMIT 1;
```
```text
+------------+----------------+-------------------+--------------------+---------------+---------------------+-----------------------------------------+-----------------+------------------+---------------------+---------------------------+----------------+-------------------+------------------+---------------------+-------------+----------------+----------------+----------------+---------------------+------------------------+-----------------------+------------------+-------------------+
| default_id | default_c_bool | default_c_tinyint | default_c_smallint | default_c_int | default_c_bigint | default_c_largeint | default_c_float | default_c_double | default_c_decimal | default_c_decimal_compact | default_c_char | default_c_varchar | default_c_string | default_datetime | defaut_time | default_c_json | default_c_ipv4 | default_c_ipv6 | default_c_array_int | default_c_array_string | default_c_map_str_int | default_c_struct | default_c_variant |
+------------+----------------+-------------------+--------------------+---------------+---------------------+-----------------------------------------+-----------------+------------------+---------------------+---------------------------+----------------+-------------------+------------------+---------------------+-------------+----------------+----------------+----------------+---------------------+------------------------+-----------------------+------------------+-------------------+
| NULL | 1 | 7 | 32000 | 2147483647 | 9223372036854775807 | 170141183460469231731687303715884105727 | 3.125 | 2.718281828 | 123456789.123456789 | 99999.1234 | charDemo | | plain string | 2025-10-25 11:22:33 | 2025-10-31 | NULL | 192.168.1.1 | 2001:db8::1 | [] | NULL | NULL | NULL | NULL |
+------------+----------------+-------------------+--------------------+---------------+---------------------+-----------------------------------------+-----------------+------------------+---------------------+---------------------------+----------------+-------------------+------------------+---------------------+-------------+----------------+----------------+----------------+---------------------+------------------------+-----------------------+------------------+-------------------+
```
Contributor
|
Thank you for your contribution to Apache Doris. Please clearly describe your PR:
|
Contributor
|
run buildall |
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Cherry-picked from #57531