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Posted to issues@spark.apache.org by "Amandeep Sharma (Jira)" <ji...@apache.org> on 2021/02/10 10:40:00 UTC
[jira] [Created] (SPARK-34417)
org.apache.spark.sql.DataFrameNaFunctions.fillMap(values: Seq[(String,
Any)]) fails for column name having a dot
Amandeep Sharma created SPARK-34417:
---------------------------------------
Summary: org.apache.spark.sql.DataFrameNaFunctions.fillMap(values: Seq[(String, Any)]) fails for column name having a dot
Key: SPARK-34417
URL: https://issues.apache.org/jira/browse/SPARK-34417
Project: Spark
Issue Type: Bug
Components: Spark Core
Affects Versions: 3.0.1
Environment: Spark version - 3.0.1
OS - macOS 10.15.7
Reporter: Amandeep Sharma
Code to reproduce the issue:
{code:java}
import org.apache.spark.sql.SparkSession
object ColumnNameWithDot {
def main(args: Array[String]): Unit = {
val spark = SparkSession.builder.appName("Simple Application")
.config("spark.master", "local").getOrCreate()
spark.sparkContext.setLogLevel("OFF")
import spark.implicits._
val df = Seq(("abc", 23), ("def", 44), (null, 0)).toDF("ColWith.Dot", "Col")
df.na.fill(Map("`ColWith.Dot`" -> "na"))
.show()
}
}
{code}
*Analysis*
*------------------------------PART-I-----------------------------------*
Debugged the spark code. It is due to a bug in the spark-catalyst code at
[https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/package.scala#L266%23L268]
Function in question resolves the column per the code-comments in the following order until a match is found.
* Consider pattern dbName.tableName.columnName
* Consider tableName.columnName
* Consider everything as columnName
But implementation considers only the first part for the resolution in the third step. It should join all parts using dot(.).
*------------------------------PART-II-----------------------------------*
If we don’t use column name with back-tick them it fails at [https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/DataFrameNaFunctions.scala#L400]
If it is quoted, the condition at [https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/DataFrameNaFunctions.scala#L413] becomes false as *k* has value quoted with back-tick whereas *f.name* is not. Then it fails at [https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/DataFrameNaFunctions.scala#L422]
It is failing due to the reason mentioned in the PART-I.
*Solution*
Make changes in [https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/package.scala#L266%23L268] as below:
{color:#FF0000}val name = nameParts.head{color}
{color:#00875a}+ val name = nameParts.mkString(".") // join all part using .{color}
val attributes = collectMatches(name, direct.get(name.toLowerCase(Locale.ROOT)))
{color:#FF0000}- (attributes, nameParts.tail){color}
{color:#00875a}+ (attributes, Seq.empty){color}
*{color:#172b4d}Workaround{color}*
{color:#172b4d}We can make change in [https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/DataFrameNaFunctions.scala#L396]
{color}
{color:#172b4d}While we are resolving the input columns, create a new map with the name of the resolved column and replace value as below.{color}
{color:#172b4d}Idea is to use resolved named instead of input name while filling null values.{color}
{code:java}
private def fillMap(values: Seq[(String, Any)]): DataFrame = {
// Error handling
var resolved: Map[String, Any] = Map()
values.foreach { case (colName, replaceValue) =>
// Check column name exists
val resolvedColumn = df.resolve(colName)
// Check data type
replaceValue match {
case _: jl.Double | _: jl.Float | _: jl.Integer | _: jl.Long | _: jl.Boolean | _: String =>
// This is good
case _ => throw new IllegalArgumentException(
s"Unsupported value type ${replaceValue.getClass.getName} ($replaceValue).")
}
resolved += (resolvedColumn.name -> replaceValue)
}
val columnEquals = df.sparkSession.sessionState.analyzer.resolver
val projections = df.schema.fields.map { f =>
resolved.find { case (k, _) => columnEquals(k, f.name) }.map { case (_, v) =>
v match {
case v: jl.Float => fillCol[Float](f, v)
case v: jl.Double => fillCol[Double](f, v)
case v: jl.Long => fillCol[Long](f, v)
case v: jl.Integer => fillCol[Integer](f, v)
case v: jl.Boolean => fillCol[Boolean](f, v.booleanValue())
case v: String => fillCol[String](f, v)
}
}.getOrElse(df.col(f.name))
}
df.select(projections : _*)
}
{code}
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