Parsing Json data - Flattening columns generates 'null' if column contains '(B)'

### Affected Version
0.22.1
### Description

Please include as much detailed information about the problem as possible.
- Cluster size: 3 , one master ,one query, one data
- Configurations in use: no change

Flattening columns generates 'null' if column contains '(B)'
i guess because of '()'

No source file, test, or entry point is named. Start by reproducing JSON column flattening with a column containing "(B)" on version 0.22.1, then trace the flattening behavior; done means the column no longer produces the literal value "null".

Written by the indexing model from the issue text.