1. Sub-task SPARK-8299
    Improve error message reporting for DataFrame and SQL
  2. Sub-task SPARK-8026
    Add Column.alias to Scala/Java API
  3. Sub-task SPARK-8021
    DataFrameReader/Writer in Python does not match Scala
  4. Sub-task SPARK-7982
    crosstab should use 0 instead of null for pairs that don't appear
  5. Sub-task SPARK-7971
    Add JavaDoc style deprecation for deprecated DataFrame methods
  6. Sub-task SPARK-7836
    DataFrame.ntile() should only accept Int as parameter
  7. Sub-task SPARK-7834
    Better error for unresolved window functions.
  8. Sub-task SPARK-7822
    Window function support in Python DataFrame DSL
  9. Sub-task SPARK-7783
    Add rollup and cube support to DataFrame Python DSL
  10. Sub-task SPARK-7742
    Figure out what to do with insertInto w.r.t. DataFrameWriter API
  11. Sub-task SPARK-7738
    DataFrame reader/writer API in Python
  12. Sub-task SPARK-7654
    DataFrameReader and DataFrameWriter for input/output API
  13. Sub-task SPARK-7606
    Document all PySpark SQL/DataFrame public methods with @since tag
  14. Sub-task SPARK-7588
    Document all SQL/DataFrame public methods with @since tag
  15. Sub-task SPARK-7551
    Don't split by dot if within backticks for DataFrame attribute resolution
  16. Sub-task SPARK-7548
    Add explode expression
  17. Sub-task SPARK-7543
    Break dataframe.py into multiple files
  18. Sub-task SPARK-7509
    Add drop column to Python DataFrame API
  19. Sub-task SPARK-7462
    By default retain group by columns in aggregate
  20. Sub-task SPARK-7358
    Move mathfunctions into functions
  21. Sub-task SPARK-7324
    Add DataFrame.dropDuplicates
  22. Sub-task SPARK-7322
    Window function support in Scala/Java DataFrame DSL
  23. Sub-task SPARK-7321
    Add Column expression for conditional statements (if, case)
  24. Sub-task SPARK-7320
    Add rollup and cube support to DataFrame Java/Scala DSL
  25. Sub-task SPARK-7319
    Improve the output from DataFrame.show()
  26. Sub-task SPARK-7295
    Add bitwise operations to DataFrame DSL
  27. Sub-task SPARK-7294
    Add a between function in Column
  28. Sub-task SPARK-7280
    Add a method for dropping a column in Java/Scala
  29. Sub-task SPARK-7276
    withColumn is very slow on dataframe with large number of columns
  30. Sub-task SPARK-7274
    Create Column expression for array/struct creation
  31. Sub-task SPARK-7248
    Random number generators for DataFrames
  32. Sub-task SPARK-7227
    Support fillna / dropna in R DataFrame
  33. Sub-task SPARK-7226
    Support math functions in R DataFrame
  34. Sub-task SPARK-7215
    Make repartition and coalesce a part of the query plan
  35. Sub-task SPARK-7188
    Support math functions in DataFrames in Python
  36. Sub-task SPARK-7156
    Add randomSplit method to DataFrame
  37. Sub-task SPARK-7152
    Add a Column expression for partition ID
  38. Sub-task SPARK-7151
    Correlation methods for DataFrame
  39. Sub-task SPARK-7150
    SQLContext.range()
  40. Sub-task SPARK-7135
    Expression for monotonically increasing IDs
  41. Sub-task SPARK-7133
    Implement struct, array, and map field accessor using apply in Scala and __getitem__ in Python
  42. Sub-task SPARK-7118
    Add coalesce Spark SQL function to PySpark API
  43. Sub-task SPARK-7073
    Clean up Python data type hierarchy
  44. Sub-task SPARK-7069
    Rename NativeType -> AtomicType
  45. Sub-task SPARK-7068
    Remove PrimitiveType
  46. Sub-task SPARK-7060
    Missing alias function on Python DataFrame
  47. Sub-task SPARK-7059
    Create a DataFrame join API to facilitate equijoin and self join
  48. Sub-task SPARK-6970
    Document what the options: Map[String, String] does on DataFrame.save and DataFrame.saveAsTable
  49. Sub-task SPARK-6876
    DataFrame.na.replace value support for Python
  50. Sub-task SPARK-6865
    Decide on semantics for string identifiers in DataFrame API
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