枚举 Encoder 

enum Encoder<'a> {
    Boolean(BooleanEncoder<'a>),
    Int(IntEncoder<'a, Int32Type>),
    Long(LongEncoder<'a, Int64Type>),
    TimestampMicros(LongEncoder<'a, TimestampMicrosecondType>),
    TimestampMillis(LongEncoder<'a, TimestampMillisecondType>),
    TimestampNanos(LongEncoder<'a, TimestampNanosecondType>),
    TimestampSecsToMillis(TimestampSecondsToMillisEncoder<'a>),
    Date32(IntEncoder<'a, Date32Type>),
    Time32SecsToMillis(Time32SecondsToMillisEncoder<'a>),
    Time32Millis(IntEncoder<'a, Time32MillisecondType>),
    Time64Micros(LongEncoder<'a, Time64MicrosecondType>),
    DurationSeconds(LongEncoder<'a, DurationSecondType>),
    DurationMillis(LongEncoder<'a, DurationMillisecondType>),
    DurationMicros(LongEncoder<'a, DurationMicrosecondType>),
    DurationNanos(LongEncoder<'a, DurationNanosecondType>),
    Float32(F32Encoder<'a>),
    Float64(F64Encoder<'a>),
    Binary(BinaryEncoder<'a, i32>),
    LargeBinary(BinaryEncoder<'a, i64>),
    Utf8(Utf8GenericEncoder<'a, i32>),
    Utf8Large(Utf8GenericEncoder<'a, i64>),
    Utf8View(Utf8ViewEncoder<'a>),
    BinaryView(BinaryViewEncoder<'a>),
    List(Box<ListEncoder<'a, i32>>),
    LargeList(Box<ListEncoder<'a, i64>>),
    ListView(Box<ListViewEncoder<'a, i32>>),
    LargeListView(Box<ListViewEncoder<'a, i64>>),
    FixedSizeList(Box<FixedSizeListEncoder<'a>>),
    Struct(Box<StructEncoder<'a>>),
    Fixed(FixedEncoder<'a>),
    Uuid(UuidEncoder<'a>),
    IntervalMonthDayNano(DurationEncoder<'a, IntervalMonthDayNanoType>),
    IntervalYearMonth(DurationEncoder<'a, IntervalYearMonthType>),
    IntervalDayTime(DurationEncoder<'a, IntervalDayTimeType>),
    Decimal32(DecimalEncoder<'a, 4, Decimal32Array>),
    Decimal64(DecimalEncoder<'a, 8, Decimal64Array>),
    Decimal128(DecimalEncoder<'a, 16, Decimal128Array>),
    Decimal256(DecimalEncoder<'a, 32, Decimal256Array>),
    Enum(EnumEncoder<'a>),
    Map(Box<MapEncoder<'a>>),
    Union(Box<UnionEncoder<'a>>),
    RunEncoded16(Box<RunEncodedEncoder<'a, Int16Type>>),
    RunEncoded32(Box<RunEncodedEncoder<'a, Int32Type>>),
    RunEncoded64(Box<RunEncodedEncoder<'a, Int64Type>>),
    Null,
}

变体

Boolean(BooleanEncoder<'a>)

Int(IntEncoder<'a, Int32Type>)

Long(LongEncoder<'a, Int64Type>)

TimestampMicros(LongEncoder<'a, TimestampMicrosecondType>)

TimestampMillis(LongEncoder<'a, TimestampMillisecondType>)

TimestampNanos(LongEncoder<'a, TimestampNanosecondType>)

TimestampSecsToMillis(TimestampSecondsToMillisEncoder<'a>)

Date32(IntEncoder<'a, Date32Type>)

Time32SecsToMillis(Time32SecondsToMillisEncoder<'a>)

Time32Millis(IntEncoder<'a, Time32MillisecondType>)

Time64Micros(LongEncoder<'a, Time64MicrosecondType>)

DurationSeconds(LongEncoder<'a, DurationSecondType>)

DurationMillis(LongEncoder<'a, DurationMillisecondType>)

DurationMicros(LongEncoder<'a, DurationMicrosecondType>)

DurationNanos(LongEncoder<'a, DurationNanosecondType>)

Float32(F32Encoder<'a>)

Float64(F64Encoder<'a>)

Binary(BinaryEncoder<'a, i32>)

LargeBinary(BinaryEncoder<'a, i64>)

Utf8(Utf8GenericEncoder<'a, i32>)

Utf8Large(Utf8GenericEncoder<'a, i64>)

Utf8View(Utf8ViewEncoder<'a>)

BinaryView(BinaryViewEncoder<'a>)

List(Box<ListEncoder<'a, i32>>)

LargeList(Box<ListEncoder<'a, i64>>)

ListView(Box<ListViewEncoder<'a, i32>>)

LargeListView(Box<ListViewEncoder<'a, i64>>)

FixedSizeList(Box<FixedSizeListEncoder<'a>>)

Struct(Box<StructEncoder<'a>>)

Fixed(FixedEncoder<'a>)

Avro fixed 编码器（原始字节，无长度）

Uuid(UuidEncoder<'a>)

Avro uuid 逻辑类型编码器（带有 RFC-4122 连字符文本的字符串）

IntervalMonthDayNano(DurationEncoder<'a, IntervalMonthDayNanoType>)

Avro duration 逻辑类型 (Arrow Interval(MonthDayNano)) 编码器

IntervalYearMonth(DurationEncoder<'a, IntervalYearMonthType>)

Avro duration 逻辑类型 (Arrow Interval(YearMonth)) 编码器

IntervalDayTime(DurationEncoder<'a, IntervalDayTimeType>)

Avro duration 逻辑类型 (Arrow Interval(DayTime)) 编码器

Decimal32(DecimalEncoder<'a, 4, Decimal32Array>)

Decimal64(DecimalEncoder<'a, 8, Decimal64Array>)

Decimal128(DecimalEncoder<'a, 16, Decimal128Array>)

Decimal256(DecimalEncoder<'a, 32, Decimal256Array>)

Enum(EnumEncoder<'a>)

Avro enum 编码器：将键 (int) 作为枚举索引写入。

Map(Box<MapEncoder<'a>>)

Union(Box<UnionEncoder<'a>>)

RunEncoded16(Box<RunEncodedEncoder<'a, Int16Type>>)

具有特定行程结束索引宽度的行程结束编码值

RunEncoded32(Box<RunEncodedEncoder<'a, Int32Type>>)

RunEncoded64(Box<RunEncodedEncoder<'a, Int64Type>>)

Null

实现

impl<'a> Encoder<'a>

fn encode<W: Write + ?Sized>( &mut self, out: &mut W, idx: usize, ) -> Result<(), ArrowError>

对 idx 处的值进行编码。