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DictionaryEncoder

alopex_core::columnar::encoding_v2

Struct DictionaryEncoder 

Source 
pub struct DictionaryEncoder;
Expand description

Dictionary encoder for Binary and Fixed columns.

Format: count(u32) + has_bitmap(u8) + bitmap? + dict_count(u32) + dict_entries + indicesu32*

  • dict_entries for Binary: {len(u32) + bytes}*
  • dict_entries for Fixed: bytes* (fixed length known from type)
  • indices: u32 LE index into dictionary

Trait Implementations§

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impl Encoder for DictionaryEncoder

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fn encode(&self, data: &Column, null_bitmap: Option<&Bitmap>) -> Result<Vec<u8>>

Encode column data with optional null bitmap.
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fn encoding_type(&self) -> EncodingV2

Get the encoding type.

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