Github user rxin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/15518#discussion_r83737706
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileCatalog.scala
 ---
    @@ -0,0 +1,66 @@
    +/*
    + * 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.fs._
    +
    +import org.apache.spark.sql.catalyst.InternalRow
    +import org.apache.spark.sql.catalyst.expressions._
    +
    +/**
    + * A collection of data files from a partitioned relation, along with the 
partition values in the
    + * form of an [[InternalRow]].
    + */
    +case class Partition(values: InternalRow, files: Seq[FileStatus])
    +
    +/**
    + * An interface for objects capable of enumerating the root paths of a 
relation as well as the
    + * partitions of a relation subject to some pruning expressions.
    + */
    +trait FileCatalog {
    +
    +  /**
    +   * Returns the list of root input paths from which the catalog will get 
files. There may be a
    +   * single root path from which partitions are discovered, or individual 
partitions may be
    +   * specified by each path.
    +   */
    +  def rootPaths: Seq[Path]
    --- End diff --
    
    what's "root" about this?



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