Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/9651#discussion_r44752326
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/sources/interfaces.scala ---
@@ -519,13 +526,33 @@ abstract class HadoopFsRelation
private[sql](maybePartitionSpec: Option[Partitio
}
/**
- * Base paths of this relation. For partitioned relations, it should be
either root directories
+ * Paths of this relation. For partitioned relations, it should be root
directories
* of all partition directories.
*
* @since 1.4.0
*/
def paths: Array[String]
+ /**
+ * Contains a set of paths that are considered as the base dirs of the
input datasets.
+ * The partitioning discovery logic will make sure it will stop when it
reaches any
+ * base path. By default, the paths of the dataset provided by users
will be base paths.
+ * For example, if a user uses
`sqlContext.read.parquet("/path/something=true/")`, the base path
+ * will be `/path/something=true/`, and the returned DataFrame will not
contain a column of
+ * `something`. If users want to override the basePath. They can set
`basePath` in the options
+ * to pass the new base path to the data source.
+ * For the above example, if the user-provided base path is `/path/`,
the returned
+ * DataFrame will have the column of `something`.
+ */
+ private def basePaths: Set[Path] = {
+ val userDefinedBasePath = parameters.get("basePath").map(basePath =>
Set(new Path(basePath)))
+ userDefinedBasePath.getOrElse {
+ // If the user does not provide basePath, we will just use paths.
+ val pathSet = paths.toSet
+ pathSet.map(p => new Path(p))
+ }
--- End diff --
Ah, actually the `basePaths` in `parsePartitions` is completely something
else with the same name.
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