Struct parquet::encoding::PlainEncoder [−][src]
pub struct PlainEncoder<T: DataType> { /* fields omitted */ }
Plain encoding that supports all types. Values are encoded back to back. The plain encoding is used whenever a more efficient encoding can not be used. It stores the data in the following format:
- BOOLEAN - 1 bit per value, 0 is false; 1 is true.
- INT32 - 4 bytes per value, stored as little-endian.
- INT64 - 8 bytes per value, stored as little-endian.
- FLOAT - 4 bytes per value, stored as IEEE little-endian.
- DOUBLE - 8 bytes per value, stored as IEEE little-endian.
- BYTE_ARRAY - 4 byte length stored as little endian, followed by bytes.
- FIXED_LEN_BYTE_ARRAY - just the bytes are stored.
Methods
impl<T: DataType> PlainEncoder<T>
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impl<T: DataType> PlainEncoder<T>
pub fn new(
desc: ColumnDescPtr,
mem_tracker: MemTrackerPtr,
vec: Vec<u8>
) -> Self
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pub fn new(
desc: ColumnDescPtr,
mem_tracker: MemTrackerPtr,
vec: Vec<u8>
) -> Self
Creates new plain encoder.
Trait Implementations
impl<T: DataType> Encoder<T> for PlainEncoder<T>
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impl<T: DataType> Encoder<T> for PlainEncoder<T>
fn put(&mut self, values: &[T::T]) -> Result<()>
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fn put(&mut self, values: &[T::T]) -> Result<()>
Encodes data from values
.
fn encoding(&self) -> Encoding
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fn encoding(&self) -> Encoding
Returns the encoding type of this encoder.
fn flush_buffer(&mut self) -> Result<ByteBufferPtr>
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fn flush_buffer(&mut self) -> Result<ByteBufferPtr>
Flushes the underlying byte buffer that's being processed by this encoder, and return the immutable copy of it. This will also reset the internal state. Read more
impl Encoder<BoolType> for PlainEncoder<BoolType>
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impl Encoder<BoolType> for PlainEncoder<BoolType>
fn put(&mut self, values: &[bool]) -> Result<()>
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fn put(&mut self, values: &[bool]) -> Result<()>
Encodes data from values
.
fn encoding(&self) -> Encoding
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fn encoding(&self) -> Encoding
Returns the encoding type of this encoder.
fn flush_buffer(&mut self) -> Result<ByteBufferPtr>
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fn flush_buffer(&mut self) -> Result<ByteBufferPtr>
Flushes the underlying byte buffer that's being processed by this encoder, and return the immutable copy of it. This will also reset the internal state. Read more
impl Encoder<Int96Type> for PlainEncoder<Int96Type>
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impl Encoder<Int96Type> for PlainEncoder<Int96Type>
fn put(&mut self, values: &[Int96]) -> Result<()>
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fn put(&mut self, values: &[Int96]) -> Result<()>
Encodes data from values
.
fn encoding(&self) -> Encoding
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fn encoding(&self) -> Encoding
Returns the encoding type of this encoder.
fn flush_buffer(&mut self) -> Result<ByteBufferPtr>
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fn flush_buffer(&mut self) -> Result<ByteBufferPtr>
Flushes the underlying byte buffer that's being processed by this encoder, and return the immutable copy of it. This will also reset the internal state. Read more
impl Encoder<ByteArrayType> for PlainEncoder<ByteArrayType>
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impl Encoder<ByteArrayType> for PlainEncoder<ByteArrayType>
fn put(&mut self, values: &[ByteArray]) -> Result<()>
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fn put(&mut self, values: &[ByteArray]) -> Result<()>
Encodes data from values
.
fn encoding(&self) -> Encoding
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fn encoding(&self) -> Encoding
Returns the encoding type of this encoder.
fn flush_buffer(&mut self) -> Result<ByteBufferPtr>
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fn flush_buffer(&mut self) -> Result<ByteBufferPtr>
Flushes the underlying byte buffer that's being processed by this encoder, and return the immutable copy of it. This will also reset the internal state. Read more
impl Encoder<FixedLenByteArrayType> for PlainEncoder<FixedLenByteArrayType>
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impl Encoder<FixedLenByteArrayType> for PlainEncoder<FixedLenByteArrayType>
fn put(&mut self, values: &[ByteArray]) -> Result<()>
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fn put(&mut self, values: &[ByteArray]) -> Result<()>
Encodes data from values
.
fn encoding(&self) -> Encoding
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fn encoding(&self) -> Encoding
Returns the encoding type of this encoder.
fn flush_buffer(&mut self) -> Result<ByteBufferPtr>
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fn flush_buffer(&mut self) -> Result<ByteBufferPtr>
Flushes the underlying byte buffer that's being processed by this encoder, and return the immutable copy of it. This will also reset the internal state. Read more
Auto Trait Implementations
impl<T> !Send for PlainEncoder<T>
impl<T> !Send for PlainEncoder<T>
impl<T> !Sync for PlainEncoder<T>
impl<T> !Sync for PlainEncoder<T>