in client/sql/dataframe.go [448:456]
func convertProtoDataTypeToStructType(input *proto.DataType) *StructType {
dataTypeStruct := input.GetStruct()
if dataTypeStruct == nil {
panic("dataType.GetStruct() is nil")
}
return &StructType{
Fields: convertProtoStructFields(dataTypeStruct.Fields),
}
}