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[SPARK-20270][SQL] na.fill should not change the values in long or integer when the default value is in double #17577

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[SPARK-20270][SQL] na.fill should not change the values in long or integer when the default value is in double #17577

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cb54407
na.fill will change the values in long or integer when the default va…
Apr 9, 2017
42c9eb0
Fix the test
Apr 9, 2017
3fb1a66
address feedback
Apr 9, 2017
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5 changes: 3 additions & 2 deletions sql/core/src/main/scala/org/apache/spark/sql/DataFrameNaFunctions.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -407,10 +407,11 @@ final class DataFrameNaFunctions private[sql](df: DataFrame) {
val quotedColName = "`" + col.name + "`"
val colValue = col.dataType match {
case DoubleType | FloatType =>
nanvl(df.col(quotedColName), lit(null)) // nanvl only supports these types
// nanvl only supports these types
nanvl(df.col(quotedColName), lit(null).cast(col.dataType))
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@gatorsmile gatorsmile Apr 9, 2017

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This is a good change, but the test case is missing. To ensure this will not be changed by others in the future, could you also add another test case? For example,

    checkAnswer(
      Seq[(java.lang.Long, java.lang.Float)]((null, 3.14f), (9123146099426677101L, null),
        (9123146560113991650L, 1.6f), (null, null)).toDF("a", "b").na.fill(0.2),
      Row(0, 3.14f) :: Row(9123146099426677101L, 0.2f) :: Row(9123146560113991650L, 1.6f)
        :: Row(0, 0.2f) :: Nil
    )

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@dbtsai dbtsai Apr 9, 2017

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The float one is covered by another test in fill with map, but still nice to have them explicitly to avoid being changed unexpectedly.

case _ => df.col(quotedColName)
}
coalesce(colValue, lit(replacement)).cast(col.dataType).as(col.name)
coalesce(colValue, lit(replacement).cast(col.dataType)).as(col.name)
}

/**
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14 changes: 14 additions & 0 deletions sql/core/src/test/scala/org/apache/spark/sql/DataFrameNaFunctionsSuite.scala
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Expand Up @@ -145,6 +145,20 @@ class DataFrameNaFunctionsSuite extends QueryTest with SharedSQLContext {
Row(1, 2) :: Row(-1, -2) :: Row(9123146099426677101L, 9123146560113991650L) :: Nil
)

checkAnswer(
Seq[(java.lang.Long, java.lang.Double)]((null, 3.14), (9123146099426677101L, null),
(9123146560113991650L, 1.6), (null, null)).toDF("a", "b").na.fill(0.2),
Row(0, 3.14) :: Row(9123146099426677101L, 0.2) :: Row(9123146560113991650L, 1.6)
:: Row(0, 0.2) :: Nil
)

checkAnswer(
Seq[(java.lang.Long, java.lang.Float)]((null, 3.14f), (9123146099426677101L, null),
(9123146560113991650L, 1.6f), (null, null)).toDF("a", "b").na.fill(0.2),
Row(0, 3.14f) :: Row(9123146099426677101L, 0.2f) :: Row(9123146560113991650L, 1.6f)
:: Row(0, 0.2f) :: Nil
)

checkAnswer(
Seq[(java.lang.Long, java.lang.Double)]((null, 1.23), (3L, null), (4L, 3.45))
.toDF("a", "b").na.fill(2.34),
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