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[Java] Adding java read compression files with LZ4 codec #289
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@@ -320,6 +320,65 @@ We are providing a path with auto generated arrow files for testing purposes, ch | |||||||||||
Jhon 29 | ||||||||||||
Thomy 33 | ||||||||||||
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Read - From Compressed File | ||||||||||||
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We are providing a path with auto generated arrow files for testing purposes, change that at your convenience. | ||||||||||||
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Compressed file generated through this code example: | ||||||||||||
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.. code:: python | ||||||||||||
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import pandas as pd | ||||||||||||
import pyarrow as pa | ||||||||||||
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pd.DataFrame({'key': range(4)}).to_feather('lz4.arrow', compression='lz4') | ||||||||||||
pd.DataFrame({'key': range(4)}).to_feather('zstd.arrow', compression='zstd') | ||||||||||||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. This isn't checked in? |
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.. note:: | ||||||||||||
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Java Vector module offer read files without compression codec, in case reading | ||||||||||||
compressed files is required consider to also add Java Compression module | ||||||||||||
dependency. | ||||||||||||
Comment on lines
+340
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+342
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Suggested change
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.. testcode:: | ||||||||||||
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import org.apache.arrow.compression.CommonsCompressionFactory; | ||||||||||||
import org.apache.arrow.memory.BufferAllocator; | ||||||||||||
import org.apache.arrow.memory.RootAllocator; | ||||||||||||
import org.apache.arrow.vector.ipc.ArrowFileReader; | ||||||||||||
import org.apache.arrow.vector.ipc.message.ArrowBlock; | ||||||||||||
import org.apache.arrow.vector.VectorSchemaRoot; | ||||||||||||
import java.io.File; | ||||||||||||
import java.io.FileInputStream; | ||||||||||||
import java.io.IOException; | ||||||||||||
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File file = new File("./thirdpartydeps/arrowfiles/lz4.arrow"); | ||||||||||||
try( | ||||||||||||
BufferAllocator rootAllocator = new RootAllocator(); | ||||||||||||
FileInputStream fileInputStream = new FileInputStream(file); | ||||||||||||
ArrowFileReader reader = new ArrowFileReader(fileInputStream.getChannel(), | ||||||||||||
rootAllocator, CommonsCompressionFactory.INSTANCE) | ||||||||||||
){ | ||||||||||||
System.out.println("Record batches in file: " + reader.getRecordBlocks().size()); | ||||||||||||
for (ArrowBlock arrowBlock : reader.getRecordBlocks()) { | ||||||||||||
reader.loadRecordBatch(arrowBlock); | ||||||||||||
VectorSchemaRoot vectorSchemaRootRecover = reader.getVectorSchemaRoot(); | ||||||||||||
System.out.print(vectorSchemaRootRecover.contentToTSVString()); | ||||||||||||
} | ||||||||||||
} catch (IOException e) { | ||||||||||||
e.printStackTrace(); | ||||||||||||
} | ||||||||||||
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.. testoutput:: | ||||||||||||
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Record batches in file: 1 | ||||||||||||
key | ||||||||||||
0 | ||||||||||||
1 | ||||||||||||
2 | ||||||||||||
3 | ||||||||||||
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Read - From Buffer | ||||||||||||
------------------ | ||||||||||||
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Is it possible to provide a write-compressed-file example too?
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Hmm. There's no practical way to write a compressed file.