harikrishnan created ARROW-6737:
-----------------------------------
Summary: Nested column branch had multiple children
Key: ARROW-6737
URL: https://issues.apache.org/jira/browse/ARROW-6737
Project: Apache Arrow
Issue Type: Bug
Reporter: harikrishnan
```
{{from pyarrow import json}}
{{import pyarrow.parquet as pq}}
{{r = json.read_json('example.jl')}}
{{pq.write_table(r,'example.parquet')}}
```
Doing the above operation resulting in `{{ArrowInvalid: Nested column branch
had multiple children}}`
Posting it here asper the request from
https://github.com/apache/arrow/issues/4045#issuecomment-535867640
The sample schema looks like this
```
package_version: string
source_version: string
uuid: string
_type: string
position: struct<ais_type: string, course: double, draught: double,
draught_raw: null, heading: double, lat: double, lon: double, nav_state: int64,
received_time: timestamp[s], speed: double>
child 0, ais_type: string
child 1, course: double
child 2, draught: double
child 3, draught_raw: null
child 4, heading: double
child 5, lat: double
child 6, lon: double
child 7, nav_state: int64
child 8, received_time: timestamp[s]
child 9, speed: double
provider_name: string
vessel: struct<beam: null, build_year: null, call_sign: string, dead_weight:
null, dwt: null, flag_code: null, flag_name: string, gross_tonnage: null, imo:
string, length: null, mmsi: string, name: string, type: null, vessel_type:
string>
child 0, beam: null
child 1, build_year: null
child 2, call_sign: string
child 3, dead_weight: null
child 4, dwt: null
child 5, flag_code: null
child 6, flag_name: string
child 7, gross_tonnage: null
child 8, imo: string
child 9, length: null
child 10, mmsi: string
child 11, name: string
child 12, type: null
child 13, vessel_type: string
source_provider: string```
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