Trait/Object

org.apache.spark.sql.execution.columnar.encoding

ColumnEncoding

Related Docs: object ColumnEncoding | package encoding

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trait ColumnEncoding extends AnyRef

Base class for encoding and decoding in columnar form. Memory layout of the bytes for a set of column values is:

 .----------------------- Encoding scheme (4 bytes)
|    .------------------- Null bitset size as number of longs N (4 bytes)
|   |
|   |   .---------------- Null bitset longs (8 x N bytes,
|   |   |                                    empty if null count is zero)
|   |   |     .---------- Encoded non-null elements
V   V   V     V
+---+---+-----+---------+
|   |   | ... | ... ... |
+---+---+-----+---------+
 \-----/ \-------------/
  header      body
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Known Subclasses
BigDictionaryDecoder, BigDictionaryDecoderBase, BigDictionaryDecoderNullable, BooleanBitSetDecoder, BooleanBitSetDecoderBase, BooleanBitSetDecoderNullable, BooleanBitSetEncoder, BooleanBitSetEncoderBase, BooleanBitSetEncoderNullable, BooleanBitSetEncoding, ColumnDecoder, ColumnDeleteEncoder, ColumnDeltaEncoder, ColumnEncoder, DictionaryDecoder, DictionaryDecoderBase, DictionaryDecoderNullable, DictionaryEncoder, DictionaryEncoderBase, DictionaryEncoderNullable, DictionaryEncoding, NotNullDecoder, NotNullEncoder, NullableDecoder, NullableEncoder, ResultSetDecoder, RunLengthDecoder, RunLengthDecoderBase, RunLengthDecoderNullable, RunLengthEncoding, Uncompressed, UncompressedDecoder, UncompressedDecoderBase, UncompressedDecoderNullable, UncompressedEncoder, UncompressedEncoderBase, UncompressedEncoderNullable, UnsafeRowDecoder
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  1. abstract def supports(dataType: DataType): Boolean

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  2. abstract def typeId: Int

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