Enum DataTypeNode 

#[non_exhaustive]
pub enum DataTypeNode {
    Bool,
    UInt8,
    UInt16,
    UInt32,
    UInt64,
    UInt128,
    UInt256,
    Int8,
    Int16,
    Int32,
    Int64,
    Int128,
    Int256,
    Float32,
    Float64,
    BFloat16,
    Decimal(u8, u8, DecimalType),
    String,
    FixedString(usize),
    UUID,
    Date,
    Date32,
    DateTime(Option<String>),
    DateTime64(DateTimePrecision, Option<String>),
    Time,
    Time64(DateTimePrecision),
    Interval(IntervalType),
    IPv4,
    IPv6,
    Nullable(Box<DataTypeNode>),
    LowCardinality(Box<DataTypeNode>),
    Array(Box<DataTypeNode>),
    Tuple(Vec<DataTypeNode>),
    Enum(EnumType, HashMap<i16, String>),
    Map([Box<DataTypeNode>; 2]),
    AggregateFunction(String, Vec<DataTypeNode>),
    SimpleAggregateFunction(String, Box<DataTypeNode>),
    Variant(Vec<DataTypeNode>),
    Dynamic,
    JSON,
    JsonWithHint(Vec<(String, Box<DataTypeNode>)>),
    Point,
    Ring,
    LineString,
    MultiLineString,
    Polygon,
    MultiPolygon,
}

Represents a data type in ClickHouse. See https://clickhouse.com/docs/sql-reference/data-types

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Bool

UInt8

UInt16

UInt32

UInt64

UInt128

UInt256

Int8

Int16

Int32

Int64

Int128

Int256

Float32

Float64

BFloat16

Decimal(u8, u8, DecimalType)

Scale, Precision, 32 | 64 | 128 | 256

String

FixedString(usize)

UUID

Date

Date32

DateTime(Option<String>)

Optional timezone

DateTime64(DateTimePrecision, Option<String>)

Precision and optional timezone

Time

Time-of-day, no timezone (timezone is ignored in value operations)

Time64(DateTimePrecision)

Precision and optional timezone (timezone is ignored in value operations)

Interval(IntervalType)

IPv4

IPv6

Nullable(Box<DataTypeNode>)

LowCardinality(Box<DataTypeNode>)

Array(Box<DataTypeNode>)

Tuple(Vec<DataTypeNode>)

Enum(EnumType, HashMap<i16, String>)

Map([Box<DataTypeNode>; 2])

Key-Value pairs are defined as an array, so it can be used as a slice

AggregateFunction(String, Vec<DataTypeNode>)

Function name and its arguments

SimpleAggregateFunction(String, Box<DataTypeNode>)

Function name and the inner type. The wire format is identical to the inner type; the function name is metadata for the MergeTree engine, not the client protocol.

Variant(Vec<DataTypeNode>)

Contains all possible types for this variant

Dynamic

JSON

JsonWithHint(Vec<(String, Box<DataTypeNode>)>)

Point

Ring

LineString

MultiLineString

Polygon

MultiPolygon

Implementations

impl DataTypeNode

pub fn new(name: &str) -> Result<DataTypeNode, TypesError>

Parses a data type from a string that is received in the RowBinaryWithNamesAndTypes and Native formats headers. See also: https://clickhouse.com/docs/interfaces/formats/RowBinaryWithNamesAndTypes#description

pub fn remove_low_cardinality(&self) -> &DataTypeNode

LowCardinality(T) -> T

pub fn remove_simple_aggregate_function(&self) -> &DataTypeNode

SimpleAggregateFunction(fn, T) -> T

The wire format of a SimpleAggregateFunction column is identical to its inner type. This method strips the wrapper so that (de)serialization validation can treat it as the inner type.

pub fn remove_compatible_wrappers(&self) -> &DataTypeNode

Remove wrapper types that are semantically identical from a data consumer’s perspective.

N.B. Nullable is not a valid lift here as nullable column data is not compatible with a non-nullable Rust type and vice versa (e.g. Nullable(UInt64) is not strictly compatible with u64).

Current types covered:

• LowCardinality
• SimpleAggregateFunction

pub fn as_str(&self) -> Option<&'static str>

If self has a static string representation (e.g. "UInt8"), return it.

Returns None for polymorphic types (e.g. Array(T) or Decimal(P, S)).

pub fn to_str(&self) -> Cow<'static, str>

Return the string representation for this type, without allocating if possible.

Trait Implementations

impl Clone for DataTypeNode

fn clone(&self) -> DataTypeNode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DataTypeNode

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

Formats the value using the given formatter.

impl Display for DataTypeNode

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

Formats the value using the given formatter.

impl PartialEq for DataTypeNode

fn eq(&self, other: &DataTypeNode) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for DataTypeNode