public UngroupedAverageProvider(string field, IRecordProvider provider) : base(provider)
{
this.field = field;
if (!provider.MetaData.ColumnDescriptors.ContainsKey(field))
{
throw new MalformedQueryException($"Could not find field named {field}");
}
MetaData = new RecordMetaData();
MetaData.AddField($"avg_of_{field}", ColumnType.Float);
}
public ComputedFieldProvider(string fieldName, ColumnType type,
Func<RecordMetaData, byte[], dynamic> computation, IRecordProvider provider) : base(provider)
{
this.fieldName = fieldName;
this.type = type;
this.computation = computation;
MetaData = new RecordMetaData();
foreach (var columnDescriptor in provider.MetaData.ColumnDescriptors)
{
MetaData.ColumnDescriptors.Add(columnDescriptor.Key, columnDescriptor.Value);
}
MetaData.AddField(fieldName, type);
}