[Bug][Load][Json] Load json format with stream load failed

[morningman]

Describe the bug
if the json data is larger than 4096 bytes, the data will be truncated, making it impossible to obtain the json data completely

To Reproduce
Load a large json file with stream load

[francisoliverlee]

@morningman
4096 bytes means a row or a file ?

[morningman]

@morningman
4096 bytes means a row or a file ?

file size.