[SPARK-4536][SQL] Add sqrt and abs to Spark SQL DSL#3401

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sarutak wants to merge 4 commits intoapache:masterfrom

sarutak:dsl-missing-operator

Commits on Nov 21, 2014

Added sqrt and abs to Spark SQL DSL
sarutak
committed

Commits on Dec 1, 2014

Merge branch 'master' of git://git.apache.org/spark into dsl-missing-operator
sarutak
committed

Commits on Dec 2, 2014

Merge branch 'master' of git://git.apache.org/spark into dsl-missing-operator
sarutak
committed
Modified Literal(null, NullType) to Literal(null) in DslQuerySuite
sarutak
committed