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OBJECT_CONSTRUCT_KEEP_NULL

Introduced or updated: v1.2.762

Creates a JSON object with keys and values.

  • The arguments are zero or more key-value pairs(where keys are strings, and values are of any type).
  • If a key is NULL, the key-value pair is omitted from the resulting object. However, if a value is NULL, the key-value pair will be kept.
  • The keys must be distinct from each other, and their order in the resulting JSON might be different from the order you specify.
  • TRY_OBJECT_CONSTRUCT_KEEP_NULL returns a NULL value if an error occurs when building the object.

Aliases

  • JSON_OBJECT_KEEP_NULL
  • TRY_JSON_OBJECT_KEEP_NULL

See also: OBJECT_CONSTRUCT

Syntax

OBJECT_CONSTRUCT_KEEP_NULL(key1, value1[, key2, value2[, ...]])

TRY_OBJECT_CONSTRUCT_KEEP_NULL(key1, value1[, key2, value2[, ...]])

Return Type

JSON object.

Examples

SELECT OBJECT_CONSTRUCT_KEEP_NULL();
┌──────────────────────────────┐
│ object_construct_keep_null()
├──────────────────────────────┤
│ {} │
└──────────────────────────────┘

SELECT OBJECT_CONSTRUCT_KEEP_NULL('a', 3.14, 'b', 'xx', 'c', NULL);
┌───────────────────────────────────────────────────────────┐
│ object_construct_keep_null('a', 3.14, 'b', 'xx', 'c', null)
├───────────────────────────────────────────────────────────┤
│ {"a":3.14,"b":"xx","c":null} │
└───────────────────────────────────────────────────────────┘

SELECT OBJECT_CONSTRUCT_KEEP_NULL('fruits', ['apple', 'banana', 'orange'], 'vegetables', ['carrot', 'celery']);
┌───────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ object_construct_keep_null('fruits', ['apple', 'banana', 'orange'], 'vegetables', ['carrot', 'celery'])
├───────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ {"fruits":["apple","banana","orange"],"vegetables":["carrot","celery"]} │
└───────────────────────────────────────────────────────────────────────────────────────────────────────┘

SELECT OBJECT_CONSTRUCT_KEEP_NULL('key');
|
1 | SELECT OBJECT_CONSTRUCT_KEEP_NULL('key')
| ^^^^^^^^^^^^^^^^^^ The number of keys and values must be equal while evaluating function `object_construct_keep_null('key')`


SELECT TRY_OBJECT_CONSTRUCT_KEEP_NULL('key');
┌─────────────────────────────────────┐
│ try_object_construct_keep_null('key')
├─────────────────────────────────────┤
NULL
└─────────────────────────────────────┘
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