MAP

MAP<K, V> A Map of K, V items, it cannot be used as a key column. Now MAP can only be used in Duplicate and Unique Model Tables.

K,V could be any of:

BOOLEAN, TINYINT, SMALLINT, INT, BIGINT, LARGEINT, FLOAT, DOUBLE, DECIMAL, DECIMALV3, DATE,
DATEV2, DATETIME, DATETIMEV2, CHAR, VARCHAR, STRING

CSV format import

Step 1: Prepare the data

Create the following csv file: test_map.csv The separator is | instead of comma to distinguish it from the comma in map.

1|{"Emily":101,"age":25}
2|{"Benjamin":102}
3|{}
4|null

Step 2: Create a table in the database

CREATE TABLE map_test (
    id       INT                 NOT NULL,
    c_map    MAP<STRING, INT>    NULL
)
DUPLICATE KEY(id)
DISTRIBUTED BY HASH(id) BUCKETS 1
PROPERTIES (
    "replication_allocation" = "tag.location.default: 1"
);

Step 3: Load data

curl --location-trusted \
        -u "root":"" \
        -H "column_separator:|" \
        -H "columns: id, c_map" \
        -T "test_map.csv" \
        http://localhost:8040/api/testdb/map_test/_stream_load

Step 4: Check the imported data

mysql> SELECT * FROM map_test;
+------+-------------------------+
| id   | c_map                   |
+------+-------------------------+
|    1 | {"Emily":101, "age":25} |
|    2 | {"Benjamin":102}        |
|    3 | {}                      |
|    4 | NULL                    |
+------+-------------------------+
4 rows in set (0.01 sec)

JSON format import

Step 1: Prepare the data

Create the following JSON file, test_map.json

[
    {"id":1, "c_map":{"Emily":101, "age":25}},
    {"id":2, "c_map":{"Benjamin":102}},
    {"id":3, "c_map":{}},
    {"id":4, "c_map":null}
]

Step 2: Create a table in the database

CREATE TABLE map_test (
    id       INT                 NOT NULL,
    c_map    MAP<STRING, INT>    NULL
)
DUPLICATE KEY(id)
DISTRIBUTED BY HASH(id) BUCKETS 1
PROPERTIES (
    "replication_allocation" = "tag.location.default: 1"
);

Step 3: Load data

curl --location-trusted \
        -u "root":"" \
        -H "format:json" \
        -H "columns: id, c_map" \
        -H "strip_outer_array:true" \
        -T "test_map.json" \
        http://localhost:8040/api/testdb/map_test/_stream_load

Step 4: Check the imported data

mysql> SELECT * FROM map_test;
+------+-------------------------+
| id   | c_map                   |
+------+-------------------------+
|    1 | {"Emily":101, "age":25} |
|    2 | {"Benjamin":102}        |
|    3 | {}                      |
|    4 | NULL                    |
+------+-------------------------+
4 rows in set (0.01 sec)

ARRAY STRUCT