public override void CreateThrift(Field se, Thrift.SchemaElement parent, IList <Thrift.SchemaElement> container)
{
base.CreateThrift(se, parent, container);
//modify this element slightly
Thrift.SchemaElement tse = container.Last();
if (se is DecimalDataField dse)
{
if (dse.ForceByteArrayEncoding)
{
tse.Type = Thrift.Type.FIXED_LEN_BYTE_ARRAY;
}
else
{
if (dse.Precision <= 9)
{
tse.Type = Thrift.Type.INT32;
}
else if (dse.Precision <= 18)
{
tse.Type = Thrift.Type.INT64;
}
else
{
tse.Type = Thrift.Type.FIXED_LEN_BYTE_ARRAY;
}
}
tse.Precision = dse.Precision;
tse.Scale = dse.Scale;
tse.Type_length = BigDecimal.GetBufferSize(dse.Precision);
}
else
{
//set defaults
tse.Precision = 38;
tse.Scale = 18;
tse.Type_length = 16;
}
}
/// <summary>
/// Constructs class instance
/// </summary>
/// <param name="name">The name of the column</param>
/// <param name="precision">Cusom precision</param>
/// <param name="scale">Custom scale</param>
/// <param name="forceByteArrayEncoding">Whether to force decimal type encoding as fixed bytes. Hive and Impala only understands decimals when forced to true.</param>
public DecimalSchemaElement(string name, int precision, int scale, bool forceByteArrayEncoding = false) : base(name)
{
if (precision < 1)
{
throw new ArgumentException("precision cannot be less than 1", nameof(precision));
}
if (scale < 1)
{
throw new ArgumentException("scale cannot be less than 1", nameof(scale));
}
Thrift.Type tt;
if (forceByteArrayEncoding)
{
tt = Parquet.Thrift.Type.FIXED_LEN_BYTE_ARRAY;
}
else
{
if (precision <= 9)
{
tt = Parquet.Thrift.Type.INT32;
}
else if (precision <= 18)
{
tt = Parquet.Thrift.Type.INT64;
}
else
{
tt = Parquet.Thrift.Type.FIXED_LEN_BYTE_ARRAY;
}
}
Thrift.Type = tt;
Thrift.Converted_type = Parquet.Thrift.ConvertedType.DECIMAL;
Thrift.Precision = precision;
Thrift.Scale = scale;
Thrift.Type_length = BigDecimal.GetBufferSize(precision);
ElementType = ColumnType = typeof(decimal);
}
