Error when using the same field on the select, group by and order by statement

Plugins SQL
1

Hi,

I have been trying to run a simple query using select, order by and group by on a String field but it keeps throwing error

This is what I’m running:
PUT _opendistro/_sql/settings
{
“query”: “SELECT StringField AS StringField FROM Index GROUP BY StringField ORDER BY StringField”
}

And I’m getting the following error

{
“error”: {
“reason”: “There was internal problem at backend”,
“details”: “invalid value operation on MISSING_VALUE”,
“type”: “IllegalStateException”
},
“status”: 500
}

I have no issues if I remove the field of the select statement and use * instead
“SELECT * FROM Index GROUP BY StringField ORDER BY StringField”

Also just by removing any of the group or, order by part of the statement also allow it to work properly.
example:
“SELECT StringField AS StringField FROM Index GROUP BY StringField”
“SELECT StringField AS StringField FROM Index ORDER BY StringField”

I have the new engine enable
PUT /_opendistro/_sql/settings { “transient” : { “opendistro.sql.engine.new.enabled” : “true” } }

Any thoughts on why this isn’t working?