[GitHub] spark issue #21857: [SPARK-21274][SQL] Implement EXCEPT ALL clause.

[SparkQA]

Github user SparkQA commented on the issue:

    https://github.com/apache/spark/pull/21857
  
    **[Test build #93488 has 
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/93488/testReport)**
 for PR 21857 at commit 
[`5cf8c4c`](https://github.com/apache/spark/commit/5cf8c4caa8bce874c5336498a6dc805f0bec1681).
     * This patch **fails Python style tests**.
     * This patch merges cleanly.
     * This patch adds the following public classes _(experimental)_:
      * `case class ReplicateRows(children: Seq[Expression]) extends Generator 
with CodegenFallback `
      * `abstract class ExceptBase(left: LogicalPlan, right: LogicalPlan) 
extends SetOperation(left, right) `
      * `case class Except(left: LogicalPlan, right: LogicalPlan) extends 
ExceptBase(left, right)`
      * `case class ExceptAll(left: LogicalPlan, right: LogicalPlan) extends 
ExceptBase(left, right)`


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