Github user ericl commented on a diff in the pull request:
    --- Diff: 
    @@ -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
    + *
    + *
    + *
    + * 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 --
    I think they are the roots of the recursive traversal to discover leaf 
files. I am inclined to keep `rootPaths` since it's easy to grep for, vs 
`paths` which is too common.

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