Enum ColumnView 

#[non_exhaustive]
pub enum ColumnView<'a> {
    Boolean(FixedColumn<'a, u8>),
    Byte(FixedColumn<'a, i8>),
    Short(FixedColumn<'a, i16>),
    Int(FixedColumn<'a, i32>),
    Long(FixedColumn<'a, i64>),
    Float(FixedColumn<'a, f32>),
    Double(FixedColumn<'a, f64>),
    Symbol(SymbolColumn<'a>),
    Timestamp(FixedColumn<'a, i64>),
    Date(FixedColumn<'a, i64>),
    Uuid(UuidColumn<'a>),
    Long256(Long256Column<'a>),
    TimestampNanos(FixedColumn<'a, i64>),
    Decimal64(Decimal64Column<'a>),
    Char(FixedColumn<'a, u16>),
    Ipv4(FixedColumn<'a, u32>),
    Varchar(VarcharColumn<'a>),
    Binary(BinaryColumn<'a>),
    Geohash(GeohashColumn<'a>),
    Decimal128(Decimal128Column<'a>),
    Decimal256(Decimal256Column<'a>),
    DoubleArray(DoubleArrayColumn<'a>),
    LongArray(LongArrayColumn<'a>),
}

Typed view over a single column in a RESULT_BATCH.

Covers every column kind the QWP egress decoder produces today: fixed-width numerics and temporals, UUID, Long256, Char, Symbol, Decimal64/128/256, Geohash, Varchar, Binary, and DOUBLE_ARRAY / LONG_ARRAY.

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.

Boolean(FixedColumn<'a, u8>)

Byte(FixedColumn<'a, i8>)

Short(FixedColumn<'a, i16>)

Int(FixedColumn<'a, i32>)

Long(FixedColumn<'a, i64>)

Float(FixedColumn<'a, f32>)

Double(FixedColumn<'a, f64>)

Symbol(SymbolColumn<'a>)

Timestamp(FixedColumn<'a, i64>)

Microsecond-precision timestamp (i64 LE).

Date(FixedColumn<'a, i64>)

Millisecond-precision date (i64 LE).

Uuid(UuidColumn<'a>)

Long256(Long256Column<'a>)

TimestampNanos(FixedColumn<'a, i64>)

Nanosecond-precision timestamp (i64 LE).

Decimal64(Decimal64Column<'a>)

Char(FixedColumn<'a, u16>)

QuestDB CHAR is a 2-byte UTF-16 code unit.

Ipv4(FixedColumn<'a, u32>)

IPv4 address as a host-order u32 (server emits LE).

Varchar(VarcharColumn<'a>)

Binary(BinaryColumn<'a>)

Geohash(GeohashColumn<'a>)

Decimal128(Decimal128Column<'a>)

Decimal256(Decimal256Column<'a>)

DoubleArray(DoubleArrayColumn<'a>)

LongArray(LongArrayColumn<'a>)

Implementations

impl<'a> ColumnView<'a>

pub fn kind(&self) -> ColumnKind

pub fn as_decimal(&self) -> Option<DecimalColumn<'a>>

Project any DECIMAL64/128/256 variant to one width-agnostic view.

The returned view borrows the same decoded buffers and performs no conversion or copy. Returns None for non-decimal columns.

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

pub fn is_null(&self, row: usize) -> bool

pub fn validity<'b>(&'b self) -> Validity<'b>

Trait Implementations

impl<'a> Clone for ColumnView<'a>

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

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Copy for ColumnView<'a>

impl<'a> Debug for ColumnView<'a>

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

Formats the value using the given formatter.