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Burak Yavuz 4dc8d74491 [SPARK-7240][SQL] Single pass covariance calculation for dataframes 
Added the calculation of covariance between two columns to DataFrames.

cc mengxr rxin

Author: Burak Yavuz <brkyvz@gmail.com>

Closes #5825 from brkyvz/df-cov and squashes the following commits:

cb18046 [Burak Yavuz] changed to sample covariance
f2e862b [Burak Yavuz] fixed failed test
51e39b8 [Burak Yavuz] moved implementation
0c6a759 [Burak Yavuz] addressed math comments
8456eca [Burak Yavuz] fix pyStyle3
aa2ad29 [Burak Yavuz] fix pyStyle2
4e97a50 [Burak Yavuz] Merge branch 'master' of github.com:apache/spark into df-cov
e3b0b85 [Burak Yavuz] addressed comments v0.1
a7115f1 [Burak Yavuz] fix python style
7dc6dbc [Burak Yavuz] reorder imports
408cb77 [Burak Yavuz] initial commit
2015-05-01 13:29:17 -07:00
..
ml [SPARK-6661] Python type errors should print type, not object 2015-04-20 10:44:09 -07:00
mllib [SPARK-6257] [PYSPARK] [MLLIB] MLlib API missing items in Recommendation 2015-04-30 23:51:00 -07:00
sql [SPARK-7240][SQL] Single pass covariance calculation for dataframes 2015-05-01 13:29:17 -07:00
streaming [SPARK-5946] [STREAMING] Add Python API for direct Kafka stream 2015-04-27 23:48:02 -07:00
__init__.py [SPARK-4172] [PySpark] Progress API in Python 2015-02-17 13:36:43 -08:00
accumulators.py [SPARK-6661] Python type errors should print type, not object 2015-04-20 10:44:09 -07:00
broadcast.py [SPARK-4897] [PySpark] Python 3 support 2015-04-16 16:20:57 -07:00
cloudpickle.py [SPARK-4897] [PySpark] Python 3 support 2015-04-16 16:20:57 -07:00
conf.py [SPARK-4897] [PySpark] Python 3 support 2015-04-16 16:20:57 -07:00
context.py [SPARK-6949] [SQL] [PySpark] Support Date/Timestamp in Column expression 2015-04-21 00:08:18 -07:00
daemon.py [SPARK-4897] [PySpark] Python 3 support 2015-04-16 16:20:57 -07:00
files.py [SPARK-3309] [PySpark] Put all public API in __all__ 2014-09-03 11:49:45 -07:00
heapq3.py [SPARK-4897] [PySpark] Python 3 support 2015-04-16 16:20:57 -07:00
java_gateway.py [SPARK-6949] [SQL] [PySpark] Support Date/Timestamp in Column expression 2015-04-21 00:08:18 -07:00
join.py [SPARK-4897] [PySpark] Python 3 support 2015-04-16 16:20:57 -07:00
profiler.py [SPARK-4897] [PySpark] Python 3 support 2015-04-16 16:20:57 -07:00
rdd.py [SPARK-6949] [SQL] [PySpark] Support Date/Timestamp in Column expression 2015-04-21 00:08:18 -07:00
rddsampler.py [SPARK-4897] [PySpark] Python 3 support 2015-04-16 16:20:57 -07:00
resultiterable.py [SPARK-3074] [PySpark] support groupByKey() with single huge key 2015-04-09 17:07:23 -07:00
serializers.py [SPARK-4897] [PySpark] Python 3 support 2015-04-16 16:20:57 -07:00
shell.py [SPARK-4897] [PySpark] Python 3 support 2015-04-16 16:20:57 -07:00
shuffle.py [SPARK-6953] [PySpark] speed up python tests 2015-04-21 17:49:55 -07:00
statcounter.py [SPARK-4897] [PySpark] Python 3 support 2015-04-16 16:20:57 -07:00
status.py [SPARK-4172] [PySpark] Progress API in Python 2015-02-17 13:36:43 -08:00
storagelevel.py [SPARK-3417] Use new-style classes in PySpark 2014-09-08 15:45:36 -07:00
tests.py [SPARK-6953] [PySpark] speed up python tests 2015-04-21 17:49:55 -07:00
traceback_utils.py [SPARK-1087] Move python traceback utilities into new traceback_utils.py file. 2014-09-15 19:28:17 -07:00
worker.py [SPARK-4897] [PySpark] Python 3 support 2015-04-16 16:20:57 -07:00