Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/14331#discussion_r72009802
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/interface.scala
---
@@ -110,6 +110,25 @@ case class CatalogTablePartition(
/**
+ * A container for bucketing information.
+ * Bucketing is a technology for decomposing data sets into more
manageable parts, and the number
+ * of buckets is fixed so it does not fluctuate with data.
+ *
+ * @param numBuckets number of buckets.
+ * @param bucketColumnNames the names of the columns that used to generate
the bucket id.
+ * @param sortColumnNames the names of the columns that used to sort data
in each bucket.
+ */
+case class BucketSpec(
+ numBuckets: Int,
+ bucketColumnNames: Seq[String],
+ sortColumnNames: Seq[String]) {
+ if (numBuckets <= 0) {
+ throw new AnalysisException(s"Expected positive number of buckets, but
got `$numBuckets`.")
+ }
+}
+
+
--- End diff --
Nit: Remove extra newline.
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