column_reader.hpp File Reference

PLAIN-encoded Parquet column decoder. More...

#include "signet/types.hpp"
#include "signet/error.hpp"
#include "signet/memory.hpp"
#include <cstdint>
#include <cstring>
#include <string>
#include <string_view>
#include <vector>

Go to the source code of this file.

Classes
class	signet::forge::ColumnReader
	PLAIN-encoded Parquet column decoder. More...

Namespaces
namespace	signet
namespace	signet::forge

Detailed Description

PLAIN-encoded Parquet column decoder.

Decodes values from a raw data page buffer using the PLAIN encoding. All reads are bounds-checked and return expected<T> on failure. Supports single-value and batch reads for every Parquet physical type.

PLAIN encoding rules (all little-endian on disk):

Type	Layout
BOOLEAN	bit-packed, LSB first
INT32	4 bytes LE
INT64	8 bytes LE
FLOAT	4 bytes LE (IEEE 754)
DOUBLE	8 bytes LE (IEEE 754)
BYTE_ARRAY	4-byte LE length prefix + N bytes
FIXED_LEN_BYTE_ARRAY	type_length bytes (no length prefix)

Definition in file column_reader.hpp.