Hi everyone!
Facing an issue while fetching document from linked Cosmos DB in Azure Synapse Studio
I've tried:
- fetching this object as:
- VARCHAR(MAX)
- NVARCHAR(MAX)
- identifying full path in WITH clause:
- failing_complex_object VARCHAR(MAX) '$.failing_complex_object'
- trying to decompose it in SELECT clause:
- ,JSON_QUERY([target_table].[failing_complex_object])
- ,JSON_VALUE(failing_complex_object, '$.failing_complex_object')
It always returns NULL.
- Complex objects without issue are bigger size and one of them is JSON object,
the other one is JSON array. - Complex object with issue is a valid JSON object.
The question is:
WHY two complex objects are fetching fine but this one fails.
Data examples are below.
Any help would be greatly appreciated.
P.S.
Due to NDA cannot share with you the actual DB data but I assure you that SCHEME is absolutely the same.
P.S. P.S.
Sorry for JSON and SQL examples. Couldn't load all the examples using "Insert code sample" tool. It didn't work.
fetch example
Document example
{
"field_01": "title",
"field_02": "12345678",
"complex_object_01": [
{
"field_01": 1,
"field_02": "data"
},
{
"field_01": 2,
"field_02": "data"
}
],
"complex_object_02": {
"rows": [
{
"field_01": 0.1,
"field_02": 0.0,
"field_03": 0.1,
"rowIndex": 0
}
]
},
"failing_complex_object": {
"data_01": {
"field_01": 0,
"field_02": 0
},
"data_02": {
"field_01": 0,
"field_02": 0
}
}
}
script example
SELECT
field_01,
field_02,
complex_object_01,
complex_object_02,
failing_complex_object
FROM OPENROWSET (
PROVIDER = 'CosmosDB',
CONNECTION = '',
OBJECT = 'target_table')
WITH (
field_01 VARCHAR(MAX),
field_02 VARCHAR(MAX),
complex_object_01 VARCHAR(MAX),
complex_object_02 VARCHAR(MAX),
failing_complex_object VARCHAR(MAX)
)
AS [target_table]
WHERE field_01 = 'title' AND field_02 = '12345678'