[SPARK-15125][SQL] Changing CSV data source mapping of empty quoted strings in the data to empty strings instead of null#12904

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sureshthalamati wants to merge 3 commits intoapache:masterfrom

sureshthalamati:empstring_fix_spark-15125

Commits on Oct 19, 2016

This patch adds boolean option emptyAsNull to CSV datasource for user to specify to interpret empty quoted strings as null or an empty string.
sureshthalamati
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Commits on Oct 20, 2016

Adding emptyValue option to will allow user to speify the mapping for empty string on read/write
sureshthalamati
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Commits on Oct 21, 2016

Merge remote-tracking branch 'upstream/master' into empstring_fix_spark-15125
sureshthalamati
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