Enum mz_repr::scalar::Datum

pub enum Datum<'a> {
    False,
    True,
    Int16(i16),
    Int32(i32),
    Int64(i64),
    UInt8(u8),
    UInt16(u16),
    UInt32(u32),
    UInt64(u64),
    Float32(OrderedFloat<f32>),
    Float64(OrderedFloat<f64>),
    Date(Date),
    Time(NaiveTime),
    Timestamp(CheckedTimestamp<NaiveDateTime>),
    TimestampTz(CheckedTimestamp<DateTime<Utc>>),
    Interval(Interval),
    Bytes(&'a [u8]),
    String(&'a str),
    Array(Array<'a>),
    List(DatumList<'a>),
    Map(DatumMap<'a>),
    Numeric(OrderedDecimal<Numeric>),
    JsonNull,
    Uuid(Uuid),
    MzTimestamp(Timestamp),
    Range(Range<DatumNested<'a>>),
    MzAclItem(MzAclItem),
    AclItem(AclItem),
    Dummy,
    Null,
}

A single value.

Notes

Equality

Datum must always derive Eq to enforce equality with repr::Row.

Datum-containing types

Because Rust disallows recursive enums, complex types which need to contain other Datums instead store bytes representing that data in other structs, usually prefixed with Datum (e.g. DatumList). These types perform a form of ad-hoc deserialization of their inner bytes to Datums via crate::row::read_datum.

To create a new instance of a Datum-referencing Datum, you need to store the inner Datum’s bytes in a row (so you can in turn borrow those bytes in the outer Datum). The idiom we’ve devised for this is a series of functions on repr::row::RowPacker prefixed with push_.

Variants

False

The false boolean value.

True

The true boolean value.

Int16(i16)

A 16-bit signed integer.

Int32(i32)

A 32-bit signed integer.

Int64(i64)

A 64-bit signed integer.

UInt8(u8)

An 8-bit unsigned integer.

UInt16(u16)

An 16-bit unsigned integer.

UInt32(u32)

A 32-bit unsigned integer.

UInt64(u64)

A 64-bit unsigned integer.

Float32(OrderedFloat<f32>)

A 32-bit floating point number.

Float64(OrderedFloat<f64>)

A 64-bit floating point number.

Date(Date)

A date.

Time(NaiveTime)

A time.

Timestamp(CheckedTimestamp<NaiveDateTime>)

A date and time, without a timezone. Note that this is not crate::Timestamp! That’s in Datum::MzTimestamp.

TimestampTz(CheckedTimestamp<DateTime<Utc>>)

A date and time, with a timezone.

Interval(Interval)

A span of time.

Bytes(&'a [u8])

A sequence of untyped bytes.

String(&'a str)

A sequence of Unicode codepoints encoded as UTF-8.

Array(Array<'a>)

Unlike Datum::List, arrays are like tensors and are not permitted to be ragged.

List(DatumList<'a>)

A sequence of Datums.

Unlike Datum::Array, lists are permitted to be ragged.

Map(DatumMap<'a>)

A mapping from string keys to Datums.

Numeric(OrderedDecimal<Numeric>)

An exact decimal number, possibly with a fractional component, with up to 39 digits of precision.

JsonNull

An unknown value within a JSON-typed Datum.

This variant is distinct from Datum::Null as a null datum is distinct from a non-null datum that contains the JSON value null.

Uuid(Uuid)

A universally unique identifier.

MzTimestamp(Timestamp)

Range(Range<DatumNested<'a>>)

A range of values, e.g. [-1, 1).

MzAclItem(MzAclItem)

A list of privileges granted to a user, that uses RoleIds for role references.

AclItem(AclItem)

A list of privileges granted to a user that uses Oids for role references. This type is used primarily for compatibility with PostgreSQL.

Dummy

A placeholder value.

Dummy values are never meant to be observed. Many operations on Datum panic if called on this variant.

Dummies are useful as placeholders in e.g. a Vec<Datum>, where it is known that a certain element of the vector is never observed and therefore needn’t be computed, but where some Datum must still be provided to maintain the shape of the vector. While any valid datum could be used for this purpose, having a dedicated variant makes it obvious when these optimizations have gone awry. If we used e.g. Datum::Null, an unexpected Datum::Null could indicate any number of problems: bad user data, bad function metadata, or a bad optimization.

Null

An unknown value.

Implementations

impl<'a> Datum<'a>

pub fn is_null(&self) -> bool

Reports whether this datum is null (i.e., is Datum::Null).

pub fn unwrap_bool(&self) -> bool

Unwraps the boolean value within this datum.

Panics

Panics if the datum is not Datum::False or Datum::True.

pub fn unwrap_int16(&self) -> i16

Unwraps the 16-bit integer value within this datum.

Panics

Panics if the datum is not Datum::Int16.

pub fn unwrap_int32(&self) -> i32

Unwraps the 32-bit integer value within this datum.

Panics

Panics if the datum is not Datum::Int32.

pub fn unwrap_int64(&self) -> i64

Unwraps the 64-bit integer value within this datum.

Panics

Panics if the datum is not Datum::Int64.

pub fn unwrap_uint8(&self) -> u8

Unwraps the 8-bit unsigned integer value within this datum.

Panics

Panics if the datum is not Datum::UInt8.

pub fn unwrap_uint16(&self) -> u16

Unwraps the 16-bit unsigned integer value within this datum.

Panics

Panics if the datum is not Datum::UInt16.

pub fn unwrap_uint32(&self) -> u32

Unwraps the 32-bit unsigned integer value within this datum.

Panics

Panics if the datum is not Datum::UInt32.

pub fn unwrap_uint64(&self) -> u64

Unwraps the 64-bit unsigned integer value within this datum.

Panics

Panics if the datum is not Datum::UInt64.

pub fn unwrap_ordered_float32(&self) -> OrderedFloat<f32>

pub fn unwrap_ordered_float64(&self) -> OrderedFloat<f64>

pub fn unwrap_float32(&self) -> f32

Unwraps the 32-bit floating-point value within this datum.

Panics

Panics if the datum is not Datum::Float32.

pub fn unwrap_float64(&self) -> f64

Unwraps the 64-bit floating-point value within this datum.

Panics

Panics if the datum is not Datum::Float64.

pub fn unwrap_date(&self) -> Date

Unwraps the date value within this datum.

Panics

Panics if the datum is not Datum::Date.

pub fn unwrap_time(&self) -> NaiveTime

Unwraps the time vaqlue within this datum.

Panics

Panics if the datum is not Datum::Time.

pub fn unwrap_timestamp(&self) -> CheckedTimestamp<NaiveDateTime>

Unwraps the timestamp value within this datum.

Panics

Panics if the datum is not Datum::Timestamp.

pub fn unwrap_timestamptz(&self) -> CheckedTimestamp<DateTime<Utc>>

Unwraps the timestamptz value within this datum.

Panics

Panics if the datum is not Datum::TimestampTz.

pub fn unwrap_interval(&self) -> Interval

Unwraps the interval value within this datum.

Panics

Panics if the datum is not Datum::Interval.

pub fn unwrap_str(&self) -> &'a str

Unwraps the string value within this datum.

Panics

Panics if the datum is not Datum::String.

pub fn unwrap_bytes(&self) -> &'a [u8]

Unwraps the bytes value within this datum.

Panics

Panics if the datum is not Datum::Bytes.

pub fn unwrap_uuid(&self) -> Uuid

Unwraps the uuid value within this datum.

Panics

Panics if the datum is not Datum::Uuid.

pub fn unwrap_array(&self) -> Array<'a>

Unwraps the array value within this datum.

Panics

Panics if the datum is not Datum::Array.

pub fn unwrap_list(&self) -> DatumList<'a>

Unwraps the list value within this datum.

Panics

Panics if the datum is not Datum::List.

pub fn unwrap_map(&self) -> DatumMap<'a>

Unwraps the map value within this datum.

Panics

Panics if the datum is not Datum::Map.

pub fn unwrap_numeric(&self) -> OrderedDecimal<Numeric>

Unwraps the numeric value within this datum.

Panics

Panics if the datum is not Datum::Numeric.

pub fn unwrap_mz_timestamp(&self) -> Timestamp

Unwraps the mz_repr::Timestamp value within this datum.

Panics

Panics if the datum is not Datum::MzTimestamp.

pub fn unwrap_range(&self) -> Range<Datum<'a>>

Unwraps the range value within this datum.

Note that the return type is a range generic over Datum, which is convenient to work with. However, the type stored in the datum is generic over DatumNested, which is necessary to avoid needless boxing of the inner Datum.

Panics

Panics if the datum is not Datum::Range.

pub fn unwrap_mz_acl_item(&self) -> MzAclItem

Unwraps the mz_acl_item value within this datum.

Panics

Panics if the datum is not Datum::MzAclItem.

pub fn unwrap_acl_item(&self) -> AclItem

Unwraps the acl_item value within this datum.

Panics

Panics if the datum is not Datum::AclItem.

pub fn is_instance_of(self, column_type: &ColumnType) -> bool

Reports whether this datum is an instance of the specified column type.

impl Datum<'_>

pub fn empty_array() -> Datum<'static>

pub fn empty_list() -> Datum<'static>

pub fn empty_map() -> Datum<'static>

Trait Implementations

impl<'a> Clone for Datum<'a>

fn clone(&self) -> Datum<'a>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a, E> DatumType<'a, E> for Datum<'a>

fn nullable() -> bool

Whether this Rust type can represent NULL values

fn fallible() -> bool

Whether this Rust type can represent errors

fn try_from_result( res: Result<Datum<'a>, E>, ) -> Result<Self, Result<Datum<'a>, E>>

Try to convert a Result whose Ok variant is a Datum into this native Rust type (Self). If it fails the error variant will contain the original result.

fn into_result(self, _temp_storage: &'a RowArena) -> Result<Datum<'a>, E>

Convert this Rust type into a Result containing a Datum, or an error

impl<'a> Debug for Datum<'a>

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

Formats the value using the given formatter.

impl Display for Datum<'_>

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

Formats the value using the given formatter.

impl<'a> From<&'a [u8]> for Datum<'a>

fn from(b: &'a [u8]) -> Datum<'a>

Converts to this type from the input type.

impl<'__enum_kinds1, 'a> From<&'__enum_kinds1 Datum<'a>> for DatumKind

fn from(_value: &'__enum_kinds1 Datum<'a>) -> Self

Converts to this type from the input type.

impl<'a> From<&'a PropDatum> for Datum<'a>

fn from(pd: &'a PropDatum) -> Self

Converts to this type from the input type.

impl<'a> From<&'a str> for Datum<'a>

fn from(s: &'a str) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<CheckedTimestamp<DateTime<Utc>>> for Datum<'a>

fn from(dt: CheckedTimestamp<DateTime<Utc>>) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<CheckedTimestamp<NaiveDateTime>> for Datum<'a>

fn from(dt: CheckedTimestamp<NaiveDateTime>) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<Date> for Datum<'a>

fn from(d: Date) -> Datum<'a>

Converts to this type from the input type.

impl<'__enum_kinds1, 'a> From<Datum<'a>> for DatumKind

fn from(value: Datum<'a>) -> Self

Converts to this type from the input type.

impl<'a> From<Datum<'a>> for ProtoDatum

fn from(x: Datum<'a>) -> Self

Converts to this type from the input type.

impl<'a> From<Decimal<NUMERIC_DATUM_WIDTH_USIZE>> for Datum<'a>

fn from(n: Numeric) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<Interval> for Datum<'a>

fn from(other: Interval) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<MzAclItem> for Datum<'a>

fn from(mz_acl_item: MzAclItem) -> Self

Converts to this type from the input type.

impl<'a> From<NaiveTime> for Datum<'a>

fn from(t: NaiveTime) -> Datum<'a>

Converts to this type from the input type.

impl<'a, T> From<Option<T>> for Datum<'a>

where Datum<'a>: From<T>,

fn from(o: Option<T>) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<OrderedDecimal<Decimal<NUMERIC_DATUM_WIDTH_USIZE>>> for Datum<'a>

fn from(n: OrderedDecimal<Numeric>) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<OrderedFloat<f32>> for Datum<'a>

fn from(f: OrderedFloat<f32>) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<OrderedFloat<f64>> for Datum<'a>

fn from(f: OrderedFloat<f64>) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<TimeDelta> for Datum<'a>

fn from(duration: Duration) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<Timestamp> for Datum<'a>

fn from(ts: Timestamp) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<Uuid> for Datum<'a>

fn from(uuid: Uuid) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<bool> for Datum<'a>

fn from(b: bool) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<f32> for Datum<'a>

fn from(f: f32) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<f64> for Datum<'a>

fn from(f: f64) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<i128> for Datum<'a>

fn from(d: i128) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<i16> for Datum<'a>

fn from(i: i16) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<i32> for Datum<'a>

fn from(i: i32) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<i64> for Datum<'a>

fn from(i: i64) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<u128> for Datum<'a>

fn from(d: u128) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<u16> for Datum<'a>

fn from(u: u16) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<u32> for Datum<'a>

fn from(u: u32) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<u64> for Datum<'a>

fn from(u: u64) -> Datum<'a>

Converts to this type from the input type.

impl<'a> From<u8> for Datum<'a>

fn from(u: u8) -> Datum<'a>

Converts to this type from the input type.

impl<'a> Hash for Datum<'a>

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<'a> Ord for Datum<'a>

fn cmp(&self, other: &Datum<'a>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized + PartialOrd,

Restrict a value to a certain interval.

impl<'a> PartialEq for Datum<'a>

fn eq(&self, other: &Datum<'a>) -> bool

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a> PartialOrd for Datum<'a>

fn partial_cmp(&self, other: &Datum<'a>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl TryFrom<Datum<'_>> for CheckedTimestamp<DateTime<Utc>>

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for CheckedTimestamp<NaiveDateTime>

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for Date

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for DateTime<Utc>

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for Interval

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for NaiveDateTime

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for NaiveTime

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for Option<Interval>

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for Option<NaiveTime>

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for Option<OrderedDecimal<Numeric>>

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for Option<OrderedFloat<f32>>

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for Option<OrderedFloat<f64>>

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for Option<Timestamp>

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for Option<bool>

type Error = ()

The type returned in the event of a conversion error.

fn try_from(datum: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for Option<f32>

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for Option<f64>

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for Option<i16>

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for Option<i32>

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for Option<i64>

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for Option<u16>

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for Option<u32>

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for Option<u64>

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for OrderedDecimal<Numeric>

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for OrderedFloat<f32>

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for OrderedFloat<f64>

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for Timestamp

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for bool

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for f32

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for f64

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for i16

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for i32

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for i64

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for u16

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for u32

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Datum<'_>> for u64

type Error = ()

The type returned in the event of a conversion error.

fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl<'a> TryInto<Datum<'a>> for DateTime<Utc>

type Error = TimestampError

The type returned in the event of a conversion error.

fn try_into(self) -> Result<Datum<'a>, Self::Error>

Performs the conversion.

impl<'a> TryInto<Datum<'a>> for NaiveDateTime

type Error = TimestampError

The type returned in the event of a conversion error.

fn try_into(self) -> Result<Datum<'a>, Self::Error>

Performs the conversion.

impl<'a> Copy for Datum<'a>

impl<'a> Eq for Datum<'a>

impl<'a> StructuralPartialEq for Datum<'a>