mz_repr::row::encode

Enum DatumColumnEncoder

Source 
enum DatumColumnEncoder {

Show 29 variants    Bool(BooleanBuilder),
    U8(UInt8Builder),
    U16(UInt16Builder),
    U32(UInt32Builder),
    U64(UInt64Builder),
    I16(Int16Builder),
    I32(Int32Builder),
    I64(Int64Builder),
    F32(Float32Builder),
    F64(Float64Builder),
    Numeric {
        binary_values: BinaryBuilder,
        approx_values: Float64Builder,
        numeric_context: Context<Numeric>,
    },
    Bytes(BinaryBuilder),
    String(StringBuilder),
    Date(Int32Builder),
    Time(FixedSizeBinaryBuilder),
    Timestamp(FixedSizeBinaryBuilder),
    TimestampTz(FixedSizeBinaryBuilder),
    MzTimestamp(UInt64Builder),
    Interval(FixedSizeBinaryBuilder),
    Uuid(FixedSizeBinaryBuilder),
    AclItem(FixedSizeBinaryBuilder),
    MzAclItem(BinaryBuilder),
    Range(BinaryBuilder),
    Jsonb {
        offsets: Vec<i32>,
        buf: Vec<u8>,
        nulls: Option<BooleanBufferBuilder>,
    },
    Array {
        dims: ListBuilder<FixedSizeBinaryBuilder>,
        val_lengths: Vec<usize>,
        vals: Box<DatumColumnEncoder>,
        nulls: Option<BooleanBufferBuilder>,
    },
    List {
        lengths: Vec<usize>,
        values: Box<DatumColumnEncoder>,
        nulls: Option<BooleanBufferBuilder>,
    },
    Map {
        lengths: Vec<usize>,
        keys: StringBuilder,
        vals: Box<DatumColumnEncoder>,
        nulls: Option<BooleanBufferBuilder>,
    },
    Record {
        fields: Vec<DatumEncoder>,
        nulls: Option<BooleanBufferBuilder>,
        length: usize,
    },
    RecordEmpty(BooleanBuilder),

}
Expand description

An encoder for a single column of Datums. To encode an entire row see RowColumnarEncoder.

Note: We specifically structure the encoder as an enum instead of using trait objects because Datum encoding is an extremely hot path and downcasting objects is relatively slow.

Variants§

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Bool(BooleanBuilder)

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U8(UInt8Builder)

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U16(UInt16Builder)

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U32(UInt32Builder)

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U64(UInt64Builder)

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I16(Int16Builder)

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I32(Int32Builder)

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I64(Int64Builder)

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F32(Float32Builder)

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F64(Float64Builder)

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Numeric

Fields

§binary_values: BinaryBuilder

The raw bytes so we can losslessly roundtrip Numerics.

§approx_values: Float64Builder

Also maintain a float64 approximation for sorting.

§numeric_context: Context<Numeric>

Re-usable libdecimal context for conversions.

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Bytes(BinaryBuilder)

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String(StringBuilder)

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Date(Int32Builder)

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Time(FixedSizeBinaryBuilder)

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Timestamp(FixedSizeBinaryBuilder)

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TimestampTz(FixedSizeBinaryBuilder)

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MzTimestamp(UInt64Builder)

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Interval(FixedSizeBinaryBuilder)

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Uuid(FixedSizeBinaryBuilder)

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AclItem(FixedSizeBinaryBuilder)

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MzAclItem(BinaryBuilder)

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Range(BinaryBuilder)

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Jsonb

Hand rolled “StringBuilder” that reduces the number of copies required to serialize JSON.

An alternative would be to use StringBuilder but that requires serializing to an intermediary string, and then copying that intermediary string into an underlying buffer.

Fields

§offsets: Vec<i32>

Monotonically increasing offsets of each encoded segment.

§buf: Vec<u8>

Buffer that contains UTF-8 encoded JSON.

§nulls: Option<BooleanBufferBuilder>

Null entries, if any.

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Array

Fields

§dims: ListBuilder<FixedSizeBinaryBuilder>

Binary encoded ArrayDimensions.

§val_lengths: Vec<usize>

Lengths of each Array in this column.

§vals: Box<DatumColumnEncoder>

Contiguous array of underlying data.

§nulls: Option<BooleanBufferBuilder>

Null entires, if any.

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List

Fields

§lengths: Vec<usize>

Lengths of each List in this column.

§values: Box<DatumColumnEncoder>

Contiguous array of underlying data.

§nulls: Option<BooleanBufferBuilder>

Null entires, if any.

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Map

Fields

§lengths: Vec<usize>

Lengths of each Map in this column

§keys: StringBuilder

Contiguous array of key data.

§vals: Box<DatumColumnEncoder>

Contiguous array of val data.

§nulls: Option<BooleanBufferBuilder>

Null entires, if any.

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Record

Fields

§fields: Vec<DatumEncoder>

Columns in the record.

§nulls: Option<BooleanBufferBuilder>

Null entries, if any.

§length: usize

Number of values we’ve pushed into this builder thus far.

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RecordEmpty(BooleanBuilder)

Special encoder for a ScalarType::Record that has no inner fields.

We have a special case for this scenario because Arrow does not allow a StructArray (what normally use to encod a Record) with no fields.

Implementations§

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impl DatumColumnEncoder

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fn goodbytes(&self) -> usize

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fn push<'e, 'd>(&'e mut self, datum: Datum<'d>)

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fn push_invalid(&mut self)

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fn finish(self) -> ArrayRef

Trait Implementations§

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impl Debug for DatumColumnEncoder

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

Formats the value using the given formatter. Read more

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