Github user HyukjinKwon commented on the pull request: https://github.com/apache/spark/pull/11724#issuecomment-197089379 Just to make sure that checking precision work fine, the codes below work correctly. ```scala import java.math.BigDecimal import scala.util.control.Exception._ def isKeepingPrecision(field: String): Boolean = { val doubleTry = allCatch opt field.toDouble val roundtripTry = doubleTry.map(BigDecimal.valueOf) val decimalTryOther = allCatch opt new BigDecimal(field) roundtripTry == decimalTryOther && doubleTry.isDefined } val losingPrecisionDoubles = Seq("10000000000000001", "-10000000000000001", "1.0000000000000001", "1.0000000000000001", "9223372036854775808") val keepingPrecisionDoubles = Seq("1.1", "1.2345") losingPrecisionDoubles.foreach(value => println(isLosingPrecision(value))) doubles.foreach(value => println(isLosingPrecision(value))) ```
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