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    from f0a83f7d52 [DOCS] Minor refinement of readme for federated tutorial
     new 174cfe9d3d [DOCS] Fix the internal slice docs for MatrixBlock
     new 37520e8d27 [MINOR] Update the internal printing of DenseBlock
     new 9241488e0c [SYSTEMDS-2699] CLA IO Compressed Matrix
     new d8936cf528 [SYSTEMDS-3438] CLA RowSlice compressed return

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Summary of changes:
 .gitignore                                         |   1 +
 src/main/java/org/apache/sysds/common/Types.java   |   3 +-
 .../runtime/compress/CompressedMatrixBlock.java    |  30 ++-
 .../compress/CompressedMatrixBlockFactory.java     |   4 +-
 .../sysds/runtime/compress/colgroup/AColGroup.java |  80 ++++---
 .../compress/colgroup/AColGroupCompressed.java     |   4 +-
 .../runtime/compress/colgroup/AColGroupOffset.java |  16 +-
 .../runtime/compress/colgroup/AColGroupValue.java  |  94 ++------
 .../compress/colgroup/ADictBasedColGroup.java      |  13 +-
 .../sysds/runtime/compress/colgroup/ASDC.java      |   7 +-
 .../sysds/runtime/compress/colgroup/ASDCZero.java  |   5 +-
 .../runtime/compress/colgroup/ColGroupConst.java   |  19 +-
 .../runtime/compress/colgroup/ColGroupDDC.java     |  19 +-
 .../runtime/compress/colgroup/ColGroupDDCFOR.java  |  50 +++--
 .../runtime/compress/colgroup/ColGroupEmpty.java   |  23 +-
 .../colgroup/ColGroupLinearFunctional.java         |  21 +-
 .../runtime/compress/colgroup/ColGroupOLE.java     |  19 +-
 .../runtime/compress/colgroup/ColGroupRLE.java     | 107 +++++++---
 .../runtime/compress/colgroup/ColGroupSDC.java     |  53 +++--
 .../runtime/compress/colgroup/ColGroupSDCFOR.java  |  53 +++--
 .../compress/colgroup/ColGroupSDCSingle.java       |  21 +-
 .../compress/colgroup/ColGroupSDCSingleZeros.java  |  19 ++
 .../compress/colgroup/ColGroupSDCZeros.java        |  22 +-
 .../compress/colgroup/ColGroupUncompressed.java    |  25 ++-
 .../compress/colgroup/dictionary/ADictionary.java  |   9 +
 .../compress/colgroup/dictionary/Dictionary.java   |  18 +-
 .../colgroup/dictionary/MatrixBlockDictionary.java |  14 ++
 .../compress/colgroup/dictionary/QDictionary.java  |   5 +
 .../compress/colgroup/mapping/AMapToData.java      |  29 +--
 .../compress/colgroup/mapping/MapToBit.java        |   8 +-
 .../compress/colgroup/mapping/MapToByte.java       |  10 +-
 .../compress/colgroup/mapping/MapToChar.java       |   8 +-
 .../compress/colgroup/mapping/MapToCharPByte.java  |  16 +-
 .../compress/colgroup/mapping/MapToInt.java        |   8 +-
 .../compress/colgroup/mapping/MapToUByte.java      |   3 +-
 .../compress/colgroup/mapping/MapToZero.java       |   8 +-
 .../runtime/compress/colgroup/offset/AOffset.java  |  95 +++++++--
 .../compress/colgroup/offset/OffsetByte.java       | 101 +++------
 .../compress/colgroup/offset/OffsetChar.java       |  83 ++------
 .../offset/{OffsetSingle.java => OffsetEmpty.java} |  93 +++-----
 .../compress/colgroup/offset/OffsetFactory.java    | 177 ++++++++++++++--
 .../compress/colgroup/offset/OffsetSingle.java     |  27 ++-
 .../compress/colgroup/offset/OffsetTwo.java        |  37 +++-
 .../compress/estim/CompressedSizeInfoColGroup.java |  22 +-
 .../compress/estim/encoding/SparseEncoding.java    |   5 +-
 .../io/CompressUnwrap.java}                        |  26 +--
 .../runtime/compress/io/CompressedWriteBlock.java  |  75 +++++++
 .../runtime/compress/io/ReaderCompressed.java      |  96 +++++++++
 .../runtime/compress/io/WriterCompressed.java      | 147 +++++++++++++
 .../sysds/runtime/compress/lib/CLALibAppend.java   |  13 +-
 .../sysds/runtime/compress/lib/CLALibCombine.java  | 191 +++++++++++++++++
 .../runtime/compress/lib/CLALibMatrixMult.java     |   8 +-
 .../sysds/runtime/compress/lib/CLALibScalar.java   |   7 +-
 .../sysds/runtime/compress/lib/CLALibSlice.java    |  64 +++++-
 .../compress/utils/DoubleIntListHashMap.java       |  11 +-
 .../context/ExecutionContextFactory.java           |  28 ++-
 .../context/SparkExecutionContext.java             |  36 +++-
 .../org/apache/sysds/runtime/data/DenseBlock.java  |  36 +++-
 .../instructions/spark/ReblockSPInstruction.java   |   7 +
 .../functions/ExtractBlockForBinaryReblock.java    |  19 +-
 .../apache/sysds/runtime/io/InputOutputInfo.java   |   6 +
 .../sysds/runtime/io/MatrixReaderFactory.java      |   8 +
 .../sysds/runtime/io/MatrixWriterFactory.java      |   6 +-
 .../sysds/runtime/matrix/data/MatrixBlock.java     | 114 +++++++---
 .../org/apache/sysds/runtime/util/HDFSTool.java    |  41 ++--
 .../component/compress/CompressedMatrixTest.java   |  40 +++-
 .../component/compress/CompressedTestBase.java     |   3 +-
 .../component/compress/colgroup/ColGroupBase.java  |   6 +
 .../compress/colgroup/ColGroupNegativeTests.java   |  40 +++-
 .../component/compress/colgroup/ColGroupTest.java  | 126 +++++++++--
 .../component/compress/combine/CombineTest.java    |  81 +++++++
 .../estim/encoding/EncodeSampleCustom.java         |  16 ++
 .../sysds/test/component/compress/io/IOEmpty.java  | 100 +++++++++
 .../test/component/compress/io/IONegativeTest.java | 139 ++++++++++++
 .../sysds/test/component/compress/io/IOSpark.java  | 170 +++++++++++++++
 .../sysds/test/component/compress/io/IOTest.java   | 151 +++++++++++++
 .../test/component/compress/io/IOTestUtils.java    |  72 +++++++
 .../compress/mapping/MappingPreAggregateTests.java |   2 +-
 .../compress/offset/OffsetSingleTests.java         |  86 ++++++--
 .../component/compress/offset/OffsetTestUtil.java  |  17 +-
 .../component/compress/offset/OffsetTests.java     | 236 ++++++++++++++++-----
 .../CompressedTestBase.java}                       |   8 +-
 .../io/compressed/ReadCompressedTest.java          | 138 ++++++++++++
 .../paramserv/SparkDataPartitionerTest.java        |   2 +-
 .../ReadCompressedTest.dml}                        |   3 +-
 85 files changed, 3082 insertions(+), 777 deletions(-)
 copy 
src/main/java/org/apache/sysds/runtime/compress/colgroup/offset/{OffsetSingle.java
 => OffsetEmpty.java} (56%)
 copy 
src/main/java/org/apache/sysds/runtime/{instructions/spark/functions/MatrixScalarUnaryFunction.java
 => compress/io/CompressUnwrap.java} (63%)
 create mode 100644 
src/main/java/org/apache/sysds/runtime/compress/io/CompressedWriteBlock.java
 create mode 100644 
src/main/java/org/apache/sysds/runtime/compress/io/ReaderCompressed.java
 create mode 100644 
src/main/java/org/apache/sysds/runtime/compress/io/WriterCompressed.java
 create mode 100644 
src/main/java/org/apache/sysds/runtime/compress/lib/CLALibCombine.java
 create mode 100644 
src/test/java/org/apache/sysds/test/component/compress/combine/CombineTest.java
 create mode 100644 
src/test/java/org/apache/sysds/test/component/compress/io/IOEmpty.java
 create mode 100644 
src/test/java/org/apache/sysds/test/component/compress/io/IONegativeTest.java
 create mode 100644 
src/test/java/org/apache/sysds/test/component/compress/io/IOSpark.java
 create mode 100644 
src/test/java/org/apache/sysds/test/component/compress/io/IOTest.java
 create mode 100644 
src/test/java/org/apache/sysds/test/component/compress/io/IOTestUtils.java
 copy src/test/java/org/apache/sysds/test/functions/io/{csv/CSVTestBase.java => 
compressed/CompressedTestBase.java} (81%)
 create mode 100644 
src/test/java/org/apache/sysds/test/functions/io/compressed/ReadCompressedTest.java
 copy src/test/scripts/functions/io/{SeqParReadTest.dml => 
compressed/ReadCompressedTest.dml} (96%)

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