Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10498#discussion_r48921611
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/bucket.scala
---
@@ -0,0 +1,83 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.execution.datasources
+
+import org.apache.hadoop.mapreduce.{Job, TaskAttemptContext}
+import org.apache.spark.sql.SQLContext
+import org.apache.spark.sql.catalyst.expressions.Attribute
+import org.apache.spark.sql.sources.{OutputWriter, OutputWriterFactory,
HadoopFsRelationProvider, HadoopFsRelation}
+import org.apache.spark.sql.types.StructType
+
+/**
+ * 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.
+ */
+private[sql] case class BucketSpec(
+ numBuckets: Int,
+ bucketColumnNames: Seq[String],
+ sortColumnNames: Seq[String])
+
+private[sql] trait BucketedHadoopFsRelationProvider extends
HadoopFsRelationProvider {
--- End diff --
should we expose the bucket API to users so that they can implement data
source supporting bucketing?
cc @rxin @nongli
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