Apache Pinot

Is there a tool / utility to read segment data . modify it and upload . I was looking to generate bulk data for query performance testing pinot . Thanks ..

I was able to figure out `pinot-tools`  and use `./pinot-admin.sh ConvertPinotSegment`  to get data from segment. however when I try to create a segment from same json file which was generate by ``ConvertPinotSegment`` I get below exception:
```2020/08/26 18:11:02.352 ERROR [PinotAdministrator] [main] Exception caught: 
java.util.concurrent.ExecutionException: java.lang.IllegalArgumentException: Value: vNGrzPyoR5w= is not Hex encoded
	at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:?]
	at java.util.concurrent.FutureTask.get(FutureTask.java:191) ~[?:?]
	at org.apache.pinot.tools.admin.command.CreateSegmentCommand.execute(CreateSegmentCommand.java:264) ~[classes/:?]
	at org.apache.pinot.tools.admin.PinotAdministrator.execute(PinotAdministrator.java:150) [classes/:?]
	at org.apache.pinot.tools.admin.PinotAdministrator.main(PinotAdministrator.java:162) [classes/:?]
Caused by: java.lang.IllegalArgumentException: Value: vNGrzPyoR5w= is not Hex encoded
	at org.apache.pinot.spi.utils.BytesUtils.toBytes(BytesUtils.java:39) ~[classes/:?]
	at org.apache.pinot.common.utils.PinotDataType$9.toBytes(PinotDataType.java:344) ~[classes/:?]
	at org.apache.pinot.common.utils.PinotDataType$10.convert(PinotDataType.java:386) ~[classes/:?]```
I used `./pinot-admin.sh CreateSegment`
cc <@UDT7GFEG6>  looking at commits in file, you might have some context. thanks

issue seems to be happening for `JSON` format, and works fine for `AVRO` 

<@U0160M7EAA0> Can you please file a PR to fix the JSON format

<@U0160M7EAA0> Are you using the same schema to generate the segment? Can you please share a sample json record?