[SPARK-9319][SPARKR] Add support for setting column names, types

[felixcheung]

Add support for for colnames, colnames<-, coltypes<-
Also added tests for names, names<- which have no test previously.

I merged with PR 8984 (coltypes). Clicked the wrong thing, crewed up the PR. Recreated it here. Was #9218

@shivaram @sun-rui

[SparkQA]

Test build #45719 has finished for PR 9654 at commit c102bc0.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #45825 has finished for PR 9654 at commit 21f36e0.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):\n * class JavaTrackStateDStream[KeyType, ValueType, StateType, EmittedType](\n

[SparkQA]

Test build #45826 has finished for PR 9654 at commit 829893d.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):\n * case class StddevSamp(child: Expression,\n * case class StddevPop(\n * class TypedColumn[-T, U](\n * class JavaTrackStateDStream[KeyType, ValueType, StateType, EmittedType](\n

[felixcheung]

any more comment?

[sun-rui]

better name: rToSQLTypes

[SparkQA]

Test build #46380 has finished for PR 9654 at commit f0419ac.

• This patch fails R style tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #46382 has finished for PR 9654 at commit 7e139f4.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[felixcheung]

updated from comments.

[felixcheung]

@sun-rui any more comment?

[felixcheung]

@sun-rui ?

[sun-rui]

Will take a look soon

[felixcheung]

Could we please review this? I think it would be great to get matching coltype<- in Spark 1.6

[SparkQA]

Test build #46831 has finished for PR 9654 at commit e399acd.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[shivaram]

colnames<- also needs to be added to the exported list of functions ?

[shivaram]

Couple of minor comments, but otherwise change looks good.

[SparkQA]

Test build #46845 has finished for PR 9654 at commit d555cf8.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[shivaram]

LGTM. Thanks @felixcheung