Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/11461#discussion_r57661684
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/columnar/compression/compressionSchemes.scala
---
@@ -530,3 +532,283 @@ private[columnar] case object LongDelta extends
CompressionScheme {
}
}
}
+
+/**
+ * Writes integral-type values with delta encoding and binary packing.
+ * The format is as follows:
--- End diff --
I just used the parquet spec./impl. as a reference; some parts of the
impl. are modified to easily compute compression size in
`gatherCompressibilityStats`.
https://github.com/Parquet/parquet-mr/blob/master/parquet-column/src/main/java/parquet/column/values/delta/DeltaBinaryPackingValuesWriter.java#L39
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