Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/14864#discussion_r78183670
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/JoinSuite.scala ---
@@ -61,6 +62,51 @@ class JoinSuite extends QueryTest with SharedSQLContext {
}
}
+ test("SPARK-15453 : Sort Merge join on bucketed + sorted tables should
not add `sort` step " +
+ "if the join predicates are subset of the sorted columns of the
tables") {
+ withTable("SPARK_15453_table_a", "SPARK_15453_table_b") {
+ withSQLConf("spark.sql.autoBroadcastJoinThreshold" -> "0") {
+ val df =
+ (0 until 8)
+ .map(i => (i, i * 2, i.toString))
+ .toDF("i", "j", "k")
+ .coalesce(1)
+ df.write.bucketBy(4, "j", "k").sortBy("j",
"k").saveAsTable("SPARK_15453_table_a")
--- End diff --
should we bucket the table by `i, j` and sort it by `j, k`? To reflect the
test name `if the join predicates are subset of the sorted columns`
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