Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/20829#discussion_r178619977
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/feature/VectorAssembler.scala ---
@@ -136,34 +181,106 @@ class VectorAssembler @Since("1.4.0")
(@Since("1.4.0") override val uid: String)
@Since("1.6.0")
object VectorAssembler extends DefaultParamsReadable[VectorAssembler] {
+ private[feature] val SKIP_INVALID: String = "skip"
+ private[feature] val ERROR_INVALID: String = "error"
+ private[feature] val KEEP_INVALID: String = "keep"
+ private[feature] val supportedHandleInvalids: Array[String] =
+ Array(SKIP_INVALID, ERROR_INVALID, KEEP_INVALID)
+
+ /**
+ * Infers lengths of vector columns from the first row of the dataset
+ * @param dataset the dataset
+ * @param columns name of vector columns whose lengths need to be
inferred
+ * @return map of column names to lengths
+ */
+ private[feature] def getVectorLengthsFromFirstRow(
+ dataset: Dataset[_], columns: Seq[String]): Map[String, Int] = {
+ try {
+ val first_row = dataset.toDF().select(columns.map(col): _*).first()
+ columns.zip(first_row.toSeq).map {
+ case (c, x) => c -> x.asInstanceOf[Vector].size
+ }.toMap
+ } catch {
+ case e: NullPointerException => throw new NullPointerException(
+ s"""Encountered null value while inferring lengths from the first
row. Consider using
+ |VectorSizeHint to add metadata for columns:
${columns.mkString("[", ", ", "]")}.
+ |""".stripMargin.replaceAll("\n", " ") + e.toString)
+ case e: NoSuchElementException => throw new NoSuchElementException(
+ s"""Encountered empty dataframe while inferring lengths from the
first row. Consider using
+ |VectorSizeHint to add metadata for columns:
${columns.mkString("[", ", ", "]")}.
+ |""".stripMargin.replaceAll("\n", " ") + e.toString)
+ }
+ }
+
+ private[feature] def getLengths(dataset: Dataset[_], columns:
Seq[String],
--- End diff --
Ditto
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