Struct parquet::encoding::PlainEncoder [−][src]
pub struct PlainEncoder<T: DataType> { /* fields omitted */ }
Expand description
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.
Implementations
impl<T: DataType> PlainEncoder<T>
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impl<T: DataType> PlainEncoder<T>
[src]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
[src]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>
[src]fn estimated_data_encoded_size(&self) -> usize
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fn estimated_data_encoded_size(&self) -> usize
[src]Returns an estimate of the encoded data, in bytes. Method call must be O(1). Read more
fn flush_buffer(&mut self) -> Result<ByteBufferPtr>
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fn flush_buffer(&mut self) -> Result<ByteBufferPtr>
[src]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> RefUnwindSafe for PlainEncoder<T> where
T: RefUnwindSafe,
T: RefUnwindSafe,
impl<T> Send for PlainEncoder<T> where
T: Send,
T: Send,
impl<T> Sync for PlainEncoder<T> where
T: Sync,
T: Sync,
impl<T> Unpin for PlainEncoder<T> where
T: Unpin,
T: Unpin,
impl<T> UnwindSafe for PlainEncoder<T> where
T: UnwindSafe,
T: UnwindSafe,
Blanket Implementations
impl<T> BorrowMut<T> for T where
T: ?Sized,
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impl<T> BorrowMut<T> for T where
T: ?Sized,
[src]pub fn borrow_mut(&mut self) -> &mut T
[src]
pub fn borrow_mut(&mut self) -> &mut T
[src]Mutably borrows from an owned value. Read more
impl<V, T> VZip<V> for T where
V: MultiLane<T>,
impl<V, T> VZip<V> for T where
V: MultiLane<T>,