#include <dict-encoding.h>

Inheritance diagram for impala::DictDecoder< T >:

Collaboration diagram for impala::DictDecoder< T >:

Public Member Functions
	DictDecoder (uint8_t *dict_buffer, int dict_len, int fixed_len_size)

virtual int	num_entries () const

bool	GetValue (T *value)

template<>
bool	GetValue (Decimal16Value *value)

void	SetData (uint8_t *buffer, int buffer_len)
	The rle encoded indices into the dictionary. More...

Protected Attributes
boost::scoped_ptr< RleDecoder >	data_decoder_

Private Attributes
std::vector< T >	dict_

Detailed Description

template<typename T>
class impala::DictDecoder< T >

Definition at line 187 of file dict-encoding.h.

Constructor & Destructor Documentation

template<typename T >

impala::DictDecoder< T >::DictDecoder	(	uint8_t *	dict_buffer,
		int	dict_len,
		int	fixed_len_size
	)

inline

The input buffer containing the dictionary. 'dict_len' is the byte length of dict_buffer. For string data, the decoder returns StringValues with data directly from dict_buffer (i.e. no copies). fixed_len_size is the size that must be passed to decode fixed-length dictionary values (values stored using FIXED_LEN_BYTE_ARRAY).

Definition at line 311 of file dict-encoding.h.

References impala::ParquetPlainEncoder::Decode().

Member Function Documentation

template<typename T >

bool impala::DictDecoder< T >::GetValue ( T * value )

inline

Returns the next value. Returns false if the data is invalid. For StringValues, this does not make a copy of the data. Instead, the string data is from the dictionary buffer passed into the c'tor.

Definition at line 264 of file dict-encoding.h.

template<>

bool impala::DictDecoder< Decimal16Value >::GetValue ( Decimal16Value * value )