Enum DataType

pub enum DataType {
    Boolean {
        column_index: usize,
    },
    Byte {
        column_index: usize,
    },
    Short {
        column_index: usize,
    },
    Int {
        column_index: usize,
    },
    Long {
        column_index: usize,
    },
    Float {
        column_index: usize,
    },
    Double {
        column_index: usize,
    },
    String {
        column_index: usize,
    },
    Varchar {
        column_index: usize,
        max_length: u32,
    },
    Char {
        column_index: usize,
        max_length: u32,
    },
    Binary {
        column_index: usize,
    },
    Decimal {
        column_index: usize,
        precision: u32,
        scale: u32,
    },
    Timestamp {
        column_index: usize,
    },
    TimestampWithLocalTimezone {
        column_index: usize,
    },
    Date {
        column_index: usize,
    },
    Struct {
        column_index: usize,
        children: Vec<NamedColumn>,
    },
    List {
        column_index: usize,
        child: Box<DataType>,
    },
    Map {
        column_index: usize,
        key: Box<DataType>,
        value: Box<DataType>,
    },
    Union {
        column_index: usize,
        variants: Vec<DataType>,
    },
}

Represents the exact data types supported by ORC.

Each variant holds the column index in order to associate the type with the specific column data present in the stripes.

Variants

Boolean

1 bit packed data.

Fields

column_index: usize

Byte

8 bit integer, also called TinyInt.

Fields

column_index: usize

Short

16 bit integer, also called SmallInt.

Fields

column_index: usize

Int

32 bit integer.

Fields

column_index: usize

Long

64 bit integer, also called BigInt.

Fields

column_index: usize

Float

32 bit floating-point number.

Fields

column_index: usize

Double

64 bit floating-point number.

Fields

column_index: usize

String

UTF-8 encoded strings.

Fields

column_index: usize

Varchar

UTF-8 encoded strings, with an upper length limit on values.

Fields

column_index: usize

max_length: u32

Char

UTF-8 encoded strings, with an upper length limit on values.

Fields

column_index: usize

max_length: u32

Binary

Arbitrary byte array values.

Fields

column_index: usize

Decimal

Decimal numbers with a fixed precision and scale.

Fields

column_index: usize

precision: u32

scale: u32

Timestamp

Represents specific date and time, down to the nanosecond, as offset since 1st January 2015, with no timezone.

The date and time represented by values of this column does not change based on the reader’s timezone.

Fields

column_index: usize

TimestampWithLocalTimezone

Represents specific date and time, down to the nanosecond, as offset since 1st January 2015, with timezone.

The date and time represented by values of this column changes based on the reader’s timezone (is a fixed instant in time).

Fields

column_index: usize

Date

Represents specific date (without time) as days since the UNIX epoch (1st January 1970 UTC).

Fields

column_index: usize

Struct

Compound type with named child subtypes, representing a structured collection of children types.

Fields

column_index: usize

children: Vec<NamedColumn>

List

Compound type where each value in the column is a list of values of another type, specified by the child type.

Fields

column_index: usize

child: Box<DataType>

Map

Compound type with two children subtypes, key and value, representing key-value pairs for column values.

Fields

column_index: usize

key: Box<DataType>

value: Box<DataType>

Union

Compound type which can represent multiple types of data within the same column.

It’s variants represent which types it can be (where each value in the column can only be one of these types).

Fields

column_index: usize

variants: Vec<DataType>

Implementations

impl DataType

pub fn column_index(&self) -> usize

Retrieve the column index of this data type, used for getting the specific column streams/statistics in the file.

pub fn children_indices(&self) -> Vec<usize>

All children column indices.

pub fn all_indices(&self) -> Vec<usize>

Includes self index and all children column indices.

pub fn to_arrow_data_type(&self) -> ArrowDataType

Trait Implementations

impl Clone for DataType

fn clone(&self) -> DataType

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for DataType

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for DataType

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.