[SPARK-19342][SPARKR] bug fixed in collect method for collecting timestamp column#16689

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Commits on Jan 24, 2017

SPARK-19342 bug fixed in collect method for collecting timestamp column
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SPARK-19342 bug fixed in collect method for collecting timestamp column
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Commits on Jan 25, 2017

SPARK-19342 bug fixed in collect method for collecting timestamp column, if column values are all NAs, the type is logical
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SPARK-19342 fix R code style error in test
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SPARK-19342 If vec is an vector with only NAs, the type will be cast to PRIMITIVE_TYPE, in addition two existed tests (@test_sparkSQL.R#1280 and @test_sparkSQL.R#1282) are modfied
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Commits on Jan 31, 2017

Commits on Feb 1, 2017

SPARK-19342 modify PRIMITIVE_TYPES for type timestamp
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Commits on Feb 4, 2017

SPARK-19342 fix for method coltypes in test_sparkSQL.R#2262
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