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  1. New Feature SPARK-20090
    Add StructType.fieldNames to Python API
  2. Sub-task SPARK-23083
    Adding Kubernetes as an option to https://spark.apache.org/
  3. Bug SPARK-22811
    pyspark.ml.tests is missing a py4j import.
  4. Improvement SPARK-21266
    Support schema a DDL-formatted string in dapply/gapply/from_json
  5. Improvement SPARK-21110
    Structs should be usable in inequality filters
  6. Improvement SPARK-20861
    Pyspark CrossValidator & TrainValidationSplit should delegate parameter looping to estimators
  7. Improvement SPARK-21149
    Add job description API for R
  8. Test SPARK-21128
    Running R tests multiple times failed due to pre-exiting "spark-warehouse" / "metastore_db"
  9. Improvement SPARK-21415
    Triage scapegoat warnings, part 1
  10. Bug SPARK-21279
    stream join hive text batch not supported
  11. Bug SPARK-21462
    Add batchId to the json of StreamingQueryProgress
  12. Test SPARK-21370
    Avoid doing anything on HDFSBackedStateStore.abort() when there are no updates to commit
  13. Improvement SPARK-20670
    Simplify FPGrowth transform
  14. Improvement SPARK-20437
    R wrappers for rollup and cube
  15. Improvement SPARK-20307
    SparkR: pass on setHandleInvalid to spark.mllib functions that use StringIndexer
  16. Improvement SPARK-20371
    R wrappers for collect_list and collect_set
  17. Bug SPARK-23468
    Failure to authenticate with old shuffle service
  18. Bug SPARK-23484
    Fix possible race condition in KafkaContinuousReader
  19. Improvement SPARK-23454
    Add Trigger information to the Structured Streaming programming guide
  20. Bug SPARK-22654
    Retry download of Spark from ASF mirror in HiveExternalCatalogVersionsSuite
  21. Bug SPARK-22495
    Fix setup of SPARK_HOME variable on Windows
  22. Improvement SPARK-22649
    localCheckpoint support in Dataset API
  23. Test SPARK-22644
    Make ML testsuite support StructuredStreaming test
  24. Bug SPARK-22637
    CatalogImpl.refresh() has quadratic complexity for a view
  25. Documentation SPARK-22490
    PySpark doc has misleading string for SparkSession.builder
  26. Bug SPARK-22332
    NaiveBayes unit test occasionly fail
  27. Improvement SPARK-22217
    ParquetFileFormat to support arbitrary OutputCommitters
  28. Improvement SPARK-22142
    Move Flume support behind a profile
  29. Sub-task SPARK-22128
    Update paranamer to 2.8 to avoid BytecodeReadingParanamer ArrayIndexOutOfBoundsException with Scala 2.12 + Java 8 lambda
  30. New Feature SPARK-30945
    Preserve JVM information when executor heartbeat timeout
  31. Improvement SPARK-21770
    ProbabilisticClassificationModel: Improve normalization of all-zero raw predictions
  32. Improvement SPARK-20550
    R wrappers for Dataset.alias
  33. Improvement SPARK-20544
    R wrapper for input_file_name
  34. Improvement SPARK-20726
    R wrapper for SQL broadcast
  35. Documentation SPARK-20456
    Add examples for functions collection for pyspark
  36. Improvement SPARK-20532
    SparkR should provide grouping and grouping_id
  37. Improvement SPARK-20535
    R wrappers for explode_outer and posexplode_outer
  38. Improvement SPARK-20533
    SparkR Wrappers Model should be private and value should be lazy
  39. Improvement SPARK-20849
    Document R DecisionTree
  40. Improvement SPARK-20375
    R wrappers for array and map
  41. Improvement SPARK-19951
    Add string concatenate operator || to Spark SQL
  42. Bug SPARK-17920
    HiveWriterContainer passes null configuration to serde.initialize, causing NullPointerException in AvroSerde when using avro.schema.url
  43. Bug SPARK-23038
    Update docker/spark-test (JDK/OS)
  44. Bug SPARK-19824
    Standalone master JSON not showing cores for running applications
  45. Sub-task SPARK-22087
    Clear remaining compile errors for 2.12; resolve most warnings
  46. Bug SPARK-18950
    Report conflicting fields when merging two StructTypes.
  47. Brainstorming SPARK-7146
    Should ML sharedParams be a public API?
  48. Improvement SPARK-9221
    Support IntervalType in Range Frame
  49. Sub-task SPARK-13786
    Pyspark ml.tuning support export/import
  50. Bug SPARK-5484
    Pregel should checkpoint periodically to avoid StackOverflowError
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