[SPARK-2041][SQL] Correctly analyze queries where columnName == tableName.

Author: Michael Armbrust <michael@databricks.com>

Closes #985 from marmbrus/tableName and squashes the following commits:

3caaa27 [Michael Armbrust] Correctly analyze queries where columnName == tableName.
Use pluggable clock in DAGSheduler #SPARK-2031

DAGScheduler supports pluggable clock like what TaskSetManager does.

Author: CrazyJvm <crazyjvm@gmail.com>

Closes #976 from CrazyJvm/clock and squashes the following commits:

6779a4c [CrazyJvm] Use pluggable clock in DAGSheduler
[SPARK-2025] Unpersist edges of previous graph in Pregel

Due to a bug introduced by apache/spark#497, Pregel does not unpersist replicated vertices from previous iterations. As a result, they stay cached until memory is full, wasting GC time.

This PR corrects the problem by unpersisting both the edges and the replicated vertices of previous iterations. This is safe because the edges and replicated vertices of the current iteration are cached by the call to `g.cache()` and then materialized by the call to `messages.count()`. Therefore no unmaterialized RDDs depend on `prevG.edges`. I verified that no recomputation occurs by running PageRank with a custom patch to Spark that warns when a partition is recomputed.

Thanks to Tim Weninger for reporting this bug.

Author: Ankur Dave <ankurdave@gmail.com>

Closes #972 from ankurdave/SPARK-2025 and squashes the following commits:

13d5b07 [Ankur Dave] Unpersist edges of previous graph in Pregel
SPARK-2043: ExternalAppendOnlyMap doesn't always find matching keys

The current implementation reads one key with the next hash code as it finishes reading the keys with the current hash code, which may cause it to miss some matches of the next key. This can cause operations like join to give the wrong result when reduce tasks spill to disk and there are hash collisions, as values won't be matched together. This PR fixes it by not reading in that next key, using a peeking iterator instead.

Author: Matei Zaharia <matei@databricks.com>

Closes #986 from mateiz/spark-2043 and squashes the following commits:

0959514 [Matei Zaharia] Added unit test for having many hash collisions
892debb [Matei Zaharia] SPARK-2043: don't read a key with the next hash code in ExternalAppendOnlyMap, instead use a buffered iterator to only read values with the current hash code.
[SPARK-2050][SQL] LIKE, RLIKE and IN in HQL should not be case sensitive.

Author: Michael Armbrust <michael@databricks.com>

Closes #989 from marmbrus/caseSensitiveFuncitons and squashes the following commits:

681de54 [Michael Armbrust] LIKE, RLIKE and IN in HQL should not be case sensitive.
[SPARK-1552] Fix type comparison bug in {map,outerJoin}Vertices

In GraphImpl, mapVertices and outerJoinVertices use a more efficient implementation when the map function conserves vertex attribute types. This is implemented by comparing the ClassTags of the old and new vertex attribute types. However, ClassTags store erased types, so the comparison will return a false positive for types with different type parameters, such as Option[Int] and Option[Double].

This PR resolves the problem by requesting that the compiler generate evidence of equality between the old and new vertex attribute types, and providing a default value for the evidence parameter if the two types are not equal. The methods can then check the value of the evidence parameter to see whether the types are equal.

It also adds a test called "mapVertices changing type with same erased type" that failed before the PR and succeeds now.

Callers of mapVertices and outerJoinVertices can no longer use a wildcard for a graph's VD type. To avoid "Error occurred in an application involving default arguments," they must bind VD to a type parameter, as this PR does for ShortestPaths and LabelPropagation.

Author: Ankur Dave <ankurdave@gmail.com>

Closes #967 from ankurdave/SPARK-1552 and squashes the following commits:

68a4fff [Ankur Dave] Undo conserve naming
7388705 [Ankur Dave] Remove unnecessary ClassTag for VD parameters
a704e5f [Ankur Dave] Use type equality constraint with default argument
29a5ab7 [Ankur Dave] Add failing test
f458c83 [Ankur Dave] Revert "[SPARK-1552] Fix type comparison bug in mapVertices and outerJoinVertices"
16d6af8 [Ankur Dave] [SPARK-1552] Fix type comparison bug in mapVertices and outerJoinVertices
[SPARK-2050 - 2][SQL] DIV and BETWEEN should not be case sensitive.

Followup: #989

Author: Michael Armbrust <michael@databricks.com>

Closes #994 from marmbrus/caseSensitiveFunctions2 and squashes the following commits:

9d9c8ed [Michael Armbrust] Fix DIV and BETWEEN.
 [SPARK-1841]: update scalatest to version 2.1.5

Author: witgo <witgo@qq.com>

Closes #713 from witgo/scalatest and squashes the following commits:

b627a6a [witgo] merge master
51fb3d6 [witgo] merge master
3771474 [witgo] fix RDDSuite
996d6f9 [witgo] fix TimeStampedWeakValueHashMap test
9dfa4e7 [witgo] merge bug
1479b22 [witgo] merge master
29b9194 [witgo] fix code style
022a7a2 [witgo] fix test dependency
a52c0fa [witgo] fix test dependency
cd8f59d [witgo] Merge branch 'master' of https://github.com/apache/spark into scalatest
046540d [witgo] fix RDDSuite.scala
2c543b9 [witgo] fix ReplSuite.scala
c458928 [witgo] update scalatest to version 2.1.5
[SPARK-1994][SQL] Weird data corruption bug when running Spark SQL on data in HDFS

Basically there is a race condition (possibly a scala bug?) when these values are recomputed on all of the slaves that results in an incorrect projection being generated (possibly because the GUID uniqueness contract is broken?).

In general we should probably enforce that all expression planing occurs on the driver, as is now occurring here.

Author: Michael Armbrust <michael@databricks.com>

Closes #1004 from marmbrus/fixAggBug and squashes the following commits:

e0c116c [Michael Armbrust] Compute aggregate expression during planning instead of lazily on workers.
HOTFIX: Support empty body in merge script

Discovered in #992

Author: Patrick Wendell <pwendell@gmail.com>

Closes #1007 from pwendell/hotfix and squashes the following commits:

af90aa0 [Patrick Wendell] HOTFIX: Support empty body in merge script
SPARK-2056 Set RDD name to input path

Author: Neville Li <neville@spotify.com>

Closes #992 from nevillelyh/master and squashes the following commits:

3011739 [Neville Li] [SPARK-2056] Set RDD name to input path
SPARK-2026: Maven Hadoop Profiles Should Set The Hadoop Version

The Maven Profiles that refer to hadoopX, e.g. `hadoop2.4`, should set the expected
`hadoop.version` and `yarn.version`.

e.g.

```
<profile>
      <id>hadoop-2.4</id>
      <properties>
        <hadoop.version>2.4.0</hadoop.version>
         <yarn.version>${hadoop.version}</yarn.version>
        <protobuf.version>2.5.0</protobuf.version>
        <jets3t.version>0.9.0</jets3t.version>
      </properties>
</profile>
```

Builds can still define the `-Dhadoop.version` option but this will correctly default the
Hadoop Version to the one that is expected according the profile that is selected.

e.g.

```$ mvn -P hadoop-2.4,yarn clean install```
or

```$ mvn -P hadoop-0.23,yarn clean install```

[ticket] : https://issues.apache.org/jira/browse/SPARK-2026

Author      : berngp
Reviewer    : ?

Author: Bernardo Gomez Palacio <bernardo.gomezpalacio@gmail.com>

Closes #998 from berngp/feature/SPARK-2026 and squashes the following commits:

07ba4f7 [Bernardo Gomez Palacio] SPARK-2026: Maven Hadoop Profiles Should Set The Hadoop Version
SPARK-1898: In deploy.yarn.Client, use YarnClient not YarnClientImpl

https://issues.apache.org/jira/browse/SPARK-1898

Author: Colin Patrick McCabe <cmccabe@cloudera.com>

Closes #850 from cmccabe/master and squashes the following commits:

d66eddc [Colin Patrick McCabe] SPARK-1898: In deploy.yarn.Client, use YarnClient rather than YarnClientImpl
SPARK-1628: Add missing hashCode methods in Partitioner subclasses

JIRA: https://issues.apache.org/jira/browse/SPARK-1628

Added `hashCode` in HashPartitioner, RangePartitioner, PythonPartitioner and PageRankUtils.CustomPartitioner.

Author: zsxwing <zsxwing@gmail.com>

Closes #549 from zsxwing/SPARK-1628 and squashes the following commits:

2620936 [zsxwing] SPARK-1628: Add missing hashCode methods in Partitioner subclasses
Update run-example

Old code can only be ran under spark_home and use "bin/run-example".
 Error "./run-example: line 55: ./bin/spark-submit: No such file or directory" appears when running in other place. So change this

Author: maji2014 <maji3@asiainfo-linkage.com>

Closes #1011 from maji2014/master and squashes the following commits:

2cc1af6 [maji2014] Update run-example

Closes #988.
SPARK-1628 follow up: Improve RangePartitioner's documentation.

Adding a paragraph clarifying a weird behavior in RangePartitioner.

See also #549.

Author: Reynold Xin <rxin@apache.org>

Closes #1012 from rxin/partitioner-doc and squashes the following commits:

6f0109e [Reynold Xin] SPARK-1628 follow up: Improve RangePartitioner's documentation.
[SPARK-2067] use relative path for Spark logo in UI

Author: Neville Li <neville@spotify.com>

Closes #1006 from nevillelyh/gh/SPARK-2067 and squashes the following commits:

9ee64cf [Neville Li] [SPARK-2067] use relative path for Spark logo in UI
Grammar: read -> reads

Author: Andrew Ash <andrew@andrewash.com>

Closes #1016 from ash211/patch-6 and squashes the following commits:

e3865c8 [Andrew Ash] Grammar: read -> reads
[SPARK-1308] Add getNumPartitions to pyspark RDD

Add getNumPartitions to pyspark RDD to provide an intuitive way to get number of partitions in RDD like we can do in scala today.

Author: Syed Hashmi <shashmi@cloudera.com>

Closes #995 from syedhashmi/master and squashes the following commits:

de0ed5e [Syed Hashmi] [SPARK-1308] Add getNumPartitions to pyspark RDD
SPARK-1944 Document --verbose in spark-shell -h

https://issues.apache.org/jira/browse/SPARK-1944

Author: Andrew Ash <andrew@andrewash.com>

Closes #1020 from ash211/SPARK-1944 and squashes the following commits:

a831c4d [Andrew Ash] SPARK-1944 Document --verbose in spark-shell -h