private Thrift.ColumnChunk WriteColumnChunk(Thrift.SchemaElement tse, List <string> path, DataColumn column, IDataTypeHandler dataTypeHandler)
{
Thrift.ColumnChunk chunk = _footer.CreateColumnChunk(_compressionMethod, _stream, tse.Type, path, 0);
Thrift.PageHeader ph = _footer.CreateDataPage(_rowCount);
_footer.GetLevels(chunk, out int maxRepetitionLevel, out int maxDefinitionLevel);
List <PageTag> pages = WriteColumn(column, tse, dataTypeHandler, maxRepetitionLevel, maxDefinitionLevel);
chunk.Meta_data.Num_values = ph.Data_page_header.Num_values;
//the following counters must include both data size and header size
chunk.Meta_data.Total_compressed_size = pages.Sum(p => p.HeaderMeta.Compressed_page_size + p.HeaderSize);
chunk.Meta_data.Total_uncompressed_size = pages.Sum(p => p.HeaderMeta.Uncompressed_page_size + p.HeaderSize);
return(chunk);
}
public Thrift.ColumnChunk Write(List <string> path, DataColumn column, IDataTypeHandler dataTypeHandler)
{
Thrift.ColumnChunk chunk = _footer.CreateColumnChunk(_compressionMethod, _stream, _schemaElement.Type, path, 0);
Thrift.PageHeader ph = _footer.CreateDataPage(column.TotalCount);
_footer.GetLevels(chunk, out int maxRepetitionLevel, out int maxDefinitionLevel);
List <PageTag> pages = WriteColumn(column, _schemaElement, dataTypeHandler, maxRepetitionLevel, maxDefinitionLevel);
//this count must be set to number of all values in the column, including nulls.
//for hierarchy/repeated columns this is a count of flattened list, including nulls.
chunk.Meta_data.Num_values = ph.Data_page_header.Num_values;
//the following counters must include both data size and header size
chunk.Meta_data.Total_compressed_size = pages.Sum(p => p.HeaderMeta.Compressed_page_size + p.HeaderSize);
chunk.Meta_data.Total_uncompressed_size = pages.Sum(p => p.HeaderMeta.Uncompressed_page_size + p.HeaderSize);
return(chunk);
}
public ColumnarWriter(Stream output, ThriftStream thriftStream,
ThriftFooter footer,
Thrift.SchemaElement tse, List <string> path,
CompressionMethod compressionMethod,
ParquetOptions formatOptions,
WriterOptions writerOptions)
{
_output = output;
_thriftStream = thriftStream;
_footer = footer;
_tse = tse;
_compressionMethod = compressionMethod;
_formatOptions = formatOptions;
_writerOptions = writerOptions;
_dataTypeHandler = DataTypeFactory.Match(tse, _formatOptions);
_chunk = _footer.CreateColumnChunk(_compressionMethod, _output, _tse.Type, path, 0);
_ph = _footer.CreateDataPage(0);
_footer.GetLevels(_chunk, out int maxRepetitionLevel, out int maxDefinitionLevel);
_maxRepetitionLevel = maxRepetitionLevel;
_maxDefinitionLevel = maxDefinitionLevel;
}