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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