[SPARK-2911]: provide rdd.parent[T](j) to obtain jth parent RDD

Author: Erik Erlandson <eerlands@redhat.com>

Closes #1841 from erikerlandson/spark-2911-pr and squashes the following commits:

4699e2f [Erik Erlandson] [SPARK-2911]: provide rdd.parent[T](j) to obtain jth parent RDD
[SPARK-2888] [SQL] Fix addColumnMetadataToConf in HiveTableScan

JIRA: https://issues.apache.org/jira/browse/SPARK-2888

Author: Yin Huai <huai@cse.ohio-state.edu>

Closes #1817 from yhuai/fixAddColumnMetadataToConf and squashes the following commits:

fba728c [Yin Huai] Fix addColumnMetadataToConf.
[SPARK-2908] [SQL] JsonRDD.nullTypeToStringType does not convert all NullType to StringType

JIRA: https://issues.apache.org/jira/browse/SPARK-2908

Author: Yin Huai <huai@cse.ohio-state.edu>

Closes #1840 from yhuai/SPARK-2908 and squashes the following commits:

86e833e [Yin Huai] Update test.
cb11759 [Yin Huai] nullTypeToStringType should check columns with the type of array of structs.
[SPARK-2877] [SQL] MetastoreRelation should use SparkClassLoader when creating the tableDesc

JIRA: https://issues.apache.org/jira/browse/SPARK-2877

Author: Yin Huai <huai@cse.ohio-state.edu>

Closes #1806 from yhuai/SPARK-2877 and squashes the following commits:

4142bcb [Yin Huai] Use Spark's classloader.
[SPARK-2919] [SQL] Basic support for analyze command in HiveQl

The command we will support is
```
ANALYZE TABLE tablename COMPUTE STATISTICS noscan
```
Other cases shown in https://cwiki.apache.org/confluence/display/Hive/StatsDev#StatsDev-ExistingTables will still be treated as Hive native commands.

JIRA: https://issues.apache.org/jira/browse/SPARK-2919

Author: Yin Huai <huai@cse.ohio-state.edu>

Closes #1848 from yhuai/sqlAnalyze and squashes the following commits:

0b79d36 [Yin Huai] Typo and format.
c59d94b [Yin Huai] Support "ANALYZE TABLE tableName COMPUTE STATISTICS noscan".
[SPARK-2700] [SQL] Hidden files (such as .impala_insert_staging) should be filtered out by sqlContext.parquetFile

Author: chutium <teng.qiu@gmail.com>

Closes #1691 from chutium/SPARK-2700 and squashes the following commits:

b76ae8c [chutium] [SPARK-2700] [SQL] fixed styling issue
d75a8bd [chutium] [SPARK-2700] [SQL] Hidden files (such as .impala_insert_staging) should be filtered out by sqlContext.parquetFile
[SPARK-1997][MLLIB] update breeze to 0.9

0.9 dependences (this version doesn't depend on scalalogging and I excluded commons-math3 from its transitive dependencies):
~~~
+-org.scalanlp:breeze_2.10:0.9 [S]
  +-com.github.fommil.netlib:core:1.1.2
  +-com.github.rwl:jtransforms:2.4.0
  +-net.sf.opencsv:opencsv:2.3
  +-net.sourceforge.f2j:arpack_combined_all:0.1
  +-org.scalanlp:breeze-macros_2.10:0.3.1 [S]
  | +-org.scalamacros:quasiquotes_2.10:2.0.0 [S]
  |
  +-org.slf4j:slf4j-api:1.7.5
  +-org.spire-math:spire_2.10:0.7.4 [S]
    +-org.scalamacros:quasiquotes_2.10:2.0.0 [S]
    |
    +-org.spire-math:spire-macros_2.10:0.7.4 [S]
      +-org.scalamacros:quasiquotes_2.10:2.0.0 [S]
~~~

Closes #1749

CC: witgo avati

Author: Xiangrui Meng <meng@databricks.com>

Closes #1857 from mengxr/breeze-0.9 and squashes the following commits:

7fc16b6 [Xiangrui Meng] don't know why but exclude a private method for mima
dcc502e [Xiangrui Meng] update breeze to 0.9
[SPARK-2897][SPARK-2920]TorrentBroadcast does use the serializer class specified in the spark option "spark.serializer"

Author: GuoQiang Li <witgo@qq.com>

Closes #1836 from witgo/SPARK-2897 and squashes the following commits:

23cdc5b [GuoQiang Li] review commit
ada4fba [GuoQiang Li] TorrentBroadcast does not support broadcast compression
fb91792 [GuoQiang Li] org.apache.spark.broadcast.TorrentBroadcast does use the serializer class specified in the spark option "spark.serializer"
[Web UI]Make decision order of Worker's WebUI port consistent with Master's

The decision order of Worker's WebUI port is "--webui-port", SPARK_WORKER_WEBUI_POR, 8081(default), spark.worker.ui.port. But in Master, the order is "--webui-port", spark.master.ui.port, SPARK_MASTER_WEBUI_PORT and 8080(default).

So we change the order in Worker's to keep it consistent with Master.

Author: WangTao <barneystinson@aliyun.com>

Closes #1838 from WangTaoTheTonic/reOrder and squashes the following commits:

460f4d4 [WangTao] Make decision order of Worker's WebUI consistent with Master's
[SPARK-2911] apply parent[T](j) to clarify UnionRDD code

References to dependencies(j) for actually obtaining RDD parents are less common than I originally estimated.   It does clarify UnionRDD (also will clarify some of my other PRs)

Use of firstParent[T] is ubiquitous, but not as sure that benefits from being replaced with parent(0)[T].

Author: Erik Erlandson <eerlands@redhat.com>

Closes #1858 from erikerlandson/spark-2911-pr2 and squashes the following commits:

7ffea74 [Erik Erlandson] [SPARK-2911] apply parent[T](j) to clarify UnionRDD code
[SPARK-2635] Fix race condition at SchedulerBackend.isReady in standalone mode

In SPARK-1946(PR #900), configuration <code>spark.scheduler.minRegisteredExecutorsRatio</code> was introduced. However, in standalone mode, there is a race condition where isReady() can return true because totalExpectedExecutors has not been correctly set.

Because expected executors is uncertain in standalone mode, the PR try to use CPU cores(<code>--total-executor-cores</code>) as expected resources to judge whether SchedulerBackend is ready.

Author: li-zhihui <zhihui.li@intel.com>
Author: Li Zhihui <zhihui.li@intel.com>

Closes #1525 from li-zhihui/fixre4s and squashes the following commits:

e9a630b [Li Zhihui] Rename variable totalExecutors and clean codes
abf4860 [Li Zhihui] Push down variable totalExpectedResources to children classes
ca54bd9 [li-zhihui] Format log with String interpolation
88c7dc6 [li-zhihui] Few codes and docs refactor
41cf47e [li-zhihui] Fix race condition at SchedulerBackend.isReady in standalone mode
[SPARK-2861] Fix Doc comment of histogram method

Tested and ready to merge.

Author: Chandan Kumar <chandan.kumar@imaginea.com>

Closes #1786 from nrchandan/spark-2861 and squashes the following commits:

cb0bc1e [Chandan Kumar] [SPARK-2861] Fix a typo in the histogram doc comment
6a2a71b [Chandan Kumar] SPARK-2861. Fix Doc comment of histogram method
Removed useless code from java_gateway.py

Added comments in utils.py and SparkSubmitArguments.scala to notice someone that both of the files should be modified simultaneously
Merge branch 'master' of git://git.apache.org/spark into SPARK-2894