[SPARK-19228][SQL] Introduce tryParseDate method to process csv date,…#20140

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Commits on Jan 3, 2018

[SPARK-19228][SQL] Introduce tryParseDate method to process csv date, add a type-widening rule in findTightestCommonType between DateType and TimestampType, add java.time.format.DateTimeFormatter t…
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Commits on Apr 19, 2018

[SPARK-19228][SQL] refactor tryParseDate method after code review, DateTimeFormatter made lazy val
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