cloud-fan commented on a change in pull request #34914:
URL: https://github.com/apache/spark/pull/34914#discussion_r779588070
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/connector/expressions/expressions.scala
##########
@@ -112,25 +111,65 @@ private[sql] final case class BucketTransform(
override def arguments: Array[Expression] = numBuckets +: columns.toArray
- override def toString: String =
- if (sortedColumns.nonEmpty) {
- s"bucket(${arguments.map(_.describe).mkString(", ")}," +
- s" ${sortedColumns.map(_.describe).mkString(", ")})"
- } else {
- s"bucket(${arguments.map(_.describe).mkString(", ")})"
- }
+ override def describe: String =
s"bucket(${arguments.map(_.describe).mkString(", ")})"
+
+ override def toString: String = describe
override def withReferences(newReferences: Seq[NamedReference]): Transform =
{
this.copy(columns = newReferences)
}
}
private[sql] object BucketTransform {
+ def unapply(expr: Expression): Option[(Int, FieldReference)] = expr match {
+ case transform: Transform =>
+ transform match {
+ case BucketTransform(n, FieldReference(parts)) =>
+ Some((n, FieldReference(parts)))
+ case _ =>
+ None
+ }
+ case _ =>
+ None
+ }
+
+ def unapply(transform: Transform): Option[(Int, NamedReference)] = transform
match {
+ case NamedTransform("bucket", Seq(
+ Lit(value: Int, IntegerType),
+ Ref(seq: Seq[String]))) =>
+ Some((value, FieldReference(seq)))
+ case _ =>
+ None
+ }
+}
+
+private[sql] final case class SortedBucketTransform(
+ numBuckets: Literal[Int],
+ columns: Seq[NamedReference],
+ sortedColumns: Seq[NamedReference] = Seq.empty[NamedReference]) extends
RewritableTransform {
+
+ override val name: String = "sortedBucket"
Review comment:
`sorted_bucket` is more SQL-ish.
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