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  1. Improvement SPARK-20410
    Make SparkConf a def instead of a val in SharedSQLContext
  2. Improvement SPARK-20064
    Bump the PySpark verison number to 2.2
  3. Bug SPARK-20027
    Compilation fixed in java docs.
  4. Bug SPARK-19853
    Uppercase Kafka topics fail when startingOffsets are SpecificOffsets
  5. Improvement SPARK-17747
    WeightCol support non-double datatypes
  6. New Feature SPARK-17629
    Add local version of Word2Vec findSynonyms for spark.ml
  7. Bug SPARK-20278
    Disable 'multiple_dots_linter' lint rule that is against project's code style
  8. Test SPARK-20105
    Add tests for checkType and type string in structField in R
  9. Improvement SPARK-20092
    Trigger AppVeyor R tests for changes in Scala code related with R API
  10. Improvement SPARK-20039
    Rename ml.stat.ChiSquare to ml.stat.ChiSquareTest
  11. Improvement SPARK-17019
    Expose off-heap memory usage in various places
  12. Improvement SPARK-19616
    weightCol and aggregationDepth should be improved for some SparkR APIs
  13. Improvement SPARK-19682
    Issue warning (or error) when subset method "[[" takes vector index
  14. Documentation SPARK-20553
    Update ALS examples for ML to illustrate recommend all
  15. Bug SPARK-20459
    JdbcUtils throws IllegalStateException: Cause already initialized after getting SQLException
  16. Improvement SPARK-20523
    Clean up build warnings for 2.2.0 release
  17. Bug SPARK-20003
    FPGrowthModel setMinConfidence should affect rules generation and transform
  18. New Feature SPARK-19911
    Add builder interface for Kinesis DStreams
  19. Improvement SPARK-18698
    public constructor with uid for IndexToString-class
  20. New Feature SPARK-18788
    Add getNumPartitions() to SparkR
  21. Improvement SPARK-19282
    RandomForestRegressionModel should expose getMaxDepth in R
  22. Documentation SPARK-19389
    Minor doc fixes, including Since tags in Python Params
  23. Improvement SPARK-19333
    Files out of compliance with ASF policy
  24. Improvement SPARK-18424
    Single Function for Parsing Dates and Times with Formats
  25. Bug SPARK-18579
    spark-csv strips whitespace (pyspark)
  26. Test SPARK-17772
    Add helper testing methods for instance weighting
  27. Bug SPARK-18730
    Ask the build script to link to Jenkins test report page instead of full console output page when posting to GitHub
  28. Documentation SPARK-18723
    Expanded programming guide information on wholeTextFiles
  29. Sub-task SPARK-18658
    Writing to a text DataSource buffers one or more lines in memory
  30. Improvement SPARK-18638
    Upgrade sbt, zinc and maven plugins
  31. Improvement SPARK-19126
    Join Documentation Improvements
  32. Improvement SPARK-19070
    Clean-up dataset actions
  33. Bug SPARK-19016
    Document scalable partition handling feature in the programming guide
  34. Improvement SPARK-18999
    simplify Literal codegen
  35. Bug SPARK-19818
    rbind should check for name consistency of input data frames
  36. Improvement SPARK-19572
    Allow to disable hive in sparkR shell
  37. Test SPARK-19560
    Improve tests for when DAGScheduler learns of "successful" ShuffleMapTask from a failed executor
  38. Documentation SPARK-19345
    Add doc for "coldStartStrategy" usage in ALS
  39. Bug SPARK-18958
    SparkR should support toJSON on DataFrame
  40. Improvement SPARK-18903
    uiWebUrl is not accessible to SparkR
  41. New Feature SPARK-17645
    Add feature selector methods based on: False Discovery Rate (FDR) and Family Wise Error rate (FWE)
  42. Bug SPARK-20929
    LinearSVC should not use shared Param HasThresholds
  43. Bug SPARK-14772
    Python ML Params.copy treats uid, paramMaps differently than Scala
  44. Sub-task SPARK-14503
    spark.ml Scala API for FPGrowth
  45. Task SPARK-12661
    Drop Python 2.6 support in PySpark
  46. Bug SPARK-24344
    Spark SQL Thrift Server issue
  47. Bug SPARK-21253
    Cannot fetch big blocks to disk
  48. Bug SPARK-20897
    cached self-join should not fail
  49. Bug SPARK-21144
    Unexpected results when the data schema and partition schema have the duplicate columns
  50. Bug SPARK-20958
    Roll back parquet-mr 1.8.2 to parquet-1.8.1
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