Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/11724#discussion_r56266282 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/CSVInferSchema.scala --- @@ -108,14 +109,38 @@ private[csv] object CSVInferSchema { } private def tryParseDouble(field: String): DataType = { - if ((allCatch opt field.toDouble).isDefined) { + val doubleTry = allCatch opt field.toDouble --- End diff -- Hm.. then wouldn't any data be inferred as `DoubleType`? I mean, if `DecimalType` is checked first then any numeric types having the lower priority would not be inferred because all the numeric types can be represented by `DecimalType`.
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