class DeltaWriter extends Closeable with StrictLogging
Builds up dictionaries and write record batches. Dictionaries are encoded as deltas to minimize redundant messages.
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- new DeltaWriter(sft: SimpleFeatureType, dictionaryFields: Seq[String], encoding: SimpleFeatureEncoding, ipcOpts: IpcOption, sort: Option[(String, Boolean)], initialCapacity: Int)
- sft
simple feature type
- dictionaryFields
dictionary fields
- encoding
simple feature encoding
- sort
sort
- initialCapacity
initial allocation size, will expand if needed
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- def close(): Unit
Close the writer
Close the writer
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- DeltaWriter → Closeable → AutoCloseable
- def encode(features: Array[SimpleFeature], count: Int): Array[Byte]
Writes out a record batch.
Writes out a record batch. Format is:
8 bytes long - threading key (foreach dictionaryField) -> { 4 byte int - length of dictionary batch anyref vector batch with dictionary delta values } 4 byte int - length of record batch record batch (may be dictionary encodings)
Note: will sort the feature array in place if sorting is defined
- features
features to write
- count
number of features to write, starting from array index 0
- returns
serialized record batch
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- def reset(): Unit
Clear any existing dictionary values
- val sft: SimpleFeatureType
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