SQLActionException[UnsupportedFeatureException: Unknown function: to_object_array and to_object CrateDB 4.2.7 及以上版本

Question

将 Crate 版本 4.1.8 升级到 4.2.7

后，我在 CrateDB 中遇到以下错误

error during main processing: SQLActionException[UnsupportedFeatureException: Unknown function: to_object_array(db_name.tbl_name."object_array_type_col_name")]
  error : {
  "message": "SQLActionException[UnsupportedFeatureException: Unknown function: to_object_array(db_name.tbl_name."object_array_type_col_name")]",
  "code": 4004
}

我正在尝试使用 INSERT INTO 和 CrateDB 中的 subsql 查询语句将数据从一个 table 移动到另一个 table 具有数据类型 OBJECT(DYNAMIC) 的列和 ARRAY(OBJECT(DYNAMIC)) 并使用现有 table.

的原始架构创建临时 table

由于在原始 table 级别有一个 column_policy = 'dynamic'，因此有几个动态添加的列具有相同的数据类型 OBJECT(DYNAMIC) 和 ARRAY(OBJECT(DYNAMIC)).

下面是完整的 SQL 查询，我用它来移动在 Crate 版本 4.1.8 上工作正常的数据，并在版本 4.2.7 上引发上述异常。

INSERT INTO temp_tbl (col1, col2_object, col3_object_array, col4, col5, dynamic_col6_object, dynamic_col6_object_array) (SELECT col1, to_object(col2_object), to_object_array(col3_object_array), col4, col5, to_object(dynamic_col6_object), to_object_array(dynamic_col6_object_array) FROM original_tbl);

更新 1：

作为@proddata 的mentioned/pointed，我确实尝试了 CAST 但遇到以下错误

error: { "message": "SQLActionException[SQLParseException: The type 'object' of the insert source 'object_col_name' is not convertible to the type 'object' of target column 'object_col_name']", "code": 4000 }

Answer 1

to_object_array() 是一个内部/未记录的 CrateDB 函数，它在 4.2 及更高版本中是隐藏的

您可以尝试使用 <column> :: <type> 或 cast(<column> AS <type>) 代替吗。

例如

SELECT
[] :: ARRAY(OBJECT(DYNAMIC)),
cast([] AS ARRAY(OBJECT(DYNAMIC)))

另见https://crate.io/docs/crate/reference/en/4.6/general/ddl/data-types.html#cast

INSERT INTO temp_tbl (col1, col2_object, col3_object_array, col4, col5, dynamic_col6_object, dynamic_col6_object_array)
(SELECT
 col1,
 col2_object :: OBJECT,
 col3_object_array :: ARRAY(OBJECT),
 col4,
 col5,
 dynamic_col6_object :: OBJECT(DYNAMIC),
 dynamic_col6_object_array :: ARRAY(OBJECT(DYNAMIC))
FROM original_tbl);

编辑：对于某些 CrateDB 版本（可能介于 4.2.x - 4.5.1 之间）存在一个错误，如果目标列中的对象列，则阻止来自另一个 table 的对象的 INSERT具有不同的对象属性，它们不是源对象列的超集。例如：

更完整的例子...

cr> CREATE TABLE dynamic_objects ( 
        col1 TEXT 
    ) WITH (column_policy = 'dynamic');                                                                                               
-- CREATE OK, 1 row affected  (1.393 sec)

cr> INSERT INTO dynamic_objects (col1, obj_dyn, obj_arr_dyn) VALUES 
        ('Hello', {a = 1}, [{x = 1},{y = 1}]);                                                                                        
-- INSERT OK, 1 row affected  (0.216 sec)

cr> CREATE TABLE dynamic_objects_copy (  
            col1 TEXT  
        ) WITH (column_policy = 'dynamic');                                                                                           
-- CREATE OK, 1 row affected  (1.342 sec)

cr> INSERT INTO dynamic_objects_copy (col1, obj_dyn, obj_arr_dyn) VALUES 
        ('Hello', {b = 1}, [{u = 1},{v = 1}]);                                                                                        
-- INSERT OK, 1 row affected  (0.140 sec)

对于版本 4.2.7，以下查询失败：

INSERT INTO dynamic_objects_copy (col1, obj_dyn, obj_arr_dyn) 
    SELECT col1, obj_dyn, obj_arr_dyn FROM dynamic_objects;

已使用 4.2.7 进行测试（bug crate#11386

的解决方法

INSERT INTO dynamic_objects_copy (col1, obj_dyn, obj_arr_dyn) 
    SELECT col1, obj_dyn::TEXT::OBJECT, obj_arr_dyn::ARRAY(TEXT)::ARRAY(OBJECT) FROM dynamic_objects;

如果列已经存在：

INSERT INTO dynamic_objects_copy (col1, obj_dyn, obj_arr_dyn) 
    SELECT col1, obj_dyn::TEXT, obj_arr_dyn::ARRAY(TEXT) FROM dynamic_objects;

使用 4.6.3 测试（有效）

INSERT INTO dynamic_objects_copy (col1, obj_dyn, obj_arr_dyn) 
    SELECT col1, obj_dyn, obj_arr_dyn FROM dynamic_objects;

 SELECT column_name, data_type  FROM information_schema.columns  
    WHERE table_name = 'dynamic_objects_copy' AND column_name NOT LIKE '%[%';                                                                                                                                            
+-------------+--------------+
| column_name | data_type    |
+-------------+--------------+
| obj_arr_dyn | object_array |
| col1        | text         |
| obj_dyn     | object       |
+-------------+--------------+

SQLActionException[UnsupportedFeatureException: Unknown function: to_object_array and to_object CrateDB 4.2.7 及以上版本

SQLActionException[UnsupportedFeatureException: Unknown function: to_object_array and to_object CrateDB 4.2.7 and upwards

sql

crate

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