Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/15024#discussion_r78495300
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSource.scala
---
@@ -435,13 +435,13 @@ case class DataSource(
// 1. Only one output path can be specified on the write path;
// 2. Output path must be a legal HDFS style file system path;
// 3. It's OK that the output path doesn't exist yet;
- val caseInsensitiveOptions = new CaseInsensitiveMap(options)
- val outputPath = {
- val path = new Path(caseInsensitiveOptions.getOrElse("path", {
- throw new IllegalArgumentException("'path' is not specified")
- }))
+ val allPaths = paths ++ new CaseInsensitiveMap(options).get("path")
--- End diff --
In the read path, multiple paths are allowed. However, the write path does
not allow it. I searched the code base for building `DataSource`. Unable to
find any data source instance that is constructed using both `paths` and
`options` as input parameters.
However, it could be zero because of a bug mentioned above.
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