taco::DataArray Struct Reference

DataArray is a plain byte array that can be stored as a Datum itself and stores the data of a few datum where we do not want to bother with creating a schema. More...

#include <base/datum.h>

Static Public Member Functions
static Datum	From (const Datum *data, uint32_t n)
	Makes a deep copy of the data and stores them in a data array. More...
template<class SomeDatum >
static size_t	GetArrayLength (SomeDatum &&d)
	Returns the array length of the DataArray stored in d. More...
template<class SomeDatum >
static Datum	GetDatum (SomeDatum &&d, size_t i)
	Returns the ith Datum of the DataArray stored in d. More...

Static Public Attributes
constexpr static uint32_t	VARLEN_MASK = 1u << 31

Detailed Description

DataArray is a plain byte array that can be stored as a Datum itself and stores the data of a few datum where we do not want to bother with creating a schema.

It is currently used for save points and rewinding in PlanExecNode. In addition the datum stored in the array may not exceed 2^31

• 1 bytes in size.

Note that DataArray do not differentiate between zero-length value and a null value. A zero-length value becomes a null Datum when GetDatum() is called.

Member Function Documentation

From()

static Datum taco::DataArray::From ( const Datum *  data, uint32_t  n  )

inlinestatic

Makes a deep copy of the data and stores them in a data array.

Returns the DataArray as a Datum that owns it.

It is undefined if n == 0.

GetArrayLength()

template<class SomeDatum >

static size_t taco::DataArray::GetArrayLength ( SomeDatum &&  d )

inlinestatic

Returns the array length of the DataArray stored in d.

GetDatum()

template<class SomeDatum >

static Datum taco::DataArray::GetDatum ( SomeDatum &&  d, size_t  i  )

inlinestatic

Returns the ith Datum of the DataArray stored in d.

The returned datum never owns the memory.

Member Data Documentation

VARLEN_MASK

constexpr static uint32_t taco::DataArray::VARLEN_MASK = 1u << 31

staticconstexpr

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The documentation for this struct was generated from the following file:

• base/datum.h