signet::forge::Column< T > Struct Template Reference

Typed column descriptor for the Schema::build() variadic API. More...

#include <schema.hpp>

Public Member Functions
	Column (std::string n)
	Construct a column with a name only (logical type auto-deduced for strings).
	Column (std::string n, LogicalType lt)
	Construct a column with an explicit logical type.
ColumnDescriptor	to_descriptor () const
	Convert to a ColumnDescriptor for Schema construction.

Public Attributes
std::string	name
	Column name.
LogicalType	logical_type = LogicalType::NONE
	Optional logical annotation.

Detailed Description

template<typename T>
struct signet::forge::Column< T >

Typed column descriptor for the Schema::build() variadic API.

Deduces the Parquet PhysicalType from the C++ template parameter T. For std::string, the LogicalType defaults to STRING unless overridden.

auto schema = Schema::build("trades",
    Column<int64_t>{"timestamp", LogicalType::TIMESTAMP_NS},
    Column<double>{"price"},
    Column<std::string>{"symbol"});

Template Parameters

T	C++ type mapped to a Parquet PhysicalType via parquet_type_of.

See also

Schema::build(), SchemaBuilder, ColumnDescriptor

Definition at line 39 of file schema.hpp.

Constructor & Destructor Documentation

Column() [1/2]

template<typename T >

signet::forge::Column< T >::Column ( std::string  n )

inline

Construct a column with a name only (logical type auto-deduced for strings).

Parameters

n	Column name.

Definition at line 45 of file schema.hpp.

Column() [2/2]

template<typename T >

signet::forge::Column< T >::Column ( std::string  n, LogicalType  lt  )

inline

Construct a column with an explicit logical type.

Parameters

n	Column name.
lt	Logical type annotation (NONE falls through to auto-deduction).

Definition at line 52 of file schema.hpp.

Member Function Documentation

to_descriptor()

template<typename T >

ColumnDescriptor signet::forge::Column< T >::to_descriptor ( ) const

inline

Convert to a ColumnDescriptor for Schema construction.

Returns

A ColumnDescriptor with physical type deduced from T.

Definition at line 60 of file schema.hpp.

Member Data Documentation

logical_type

template<typename T >

LogicalType signet::forge::Column< T >::logical_type = LogicalType::NONE

Optional logical annotation.

Definition at line 41 of file schema.hpp.

name

template<typename T >

std::string signet::forge::Column< T >::name

Column name.

Definition at line 40 of file schema.hpp.

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

• include/signet/schema.hpp