[jira] [Created] (SPARK-23172) Respect Project nodes in ReorderJoin

["Takeshi Yamamuro (JIRA)" <ji...@apache.org>]

Takeshi Yamamuro created SPARK-23172:
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             Summary: Respect Project nodes in ReorderJoin
                 Key: SPARK-23172
                 URL: https://issues.apache.org/jira/browse/SPARK-23172
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.2.1
            Reporter: Takeshi Yamamuro


The current `ReorderJoin` optimizer rule cannot flatten a pattern `Join -> Project -> Join` because `ExtractFiltersAndInnerJoins`
doesn't handle `Project` nodes. So, the current master cannot reorder joins in a query below;
{code}
val df1 = spark.range(100).selectExpr("id % 10 AS k0", s"id % 10 AS k1", s"id % 10 AS k2", "id AS v1")
val df2 = spark.range(10).selectExpr("id AS k0", "id AS v2")
val df3 = spark.range(10).selectExpr("id AS k1", "id AS v3")
val df4 = spark.range(10).selectExpr("id AS k2", "id AS v4")
df1.join(df2, "k0").join(df3, "k1").join(df4, "k2").explain(true)

== Analyzed Logical Plan ==
k2: bigint, k1: bigint, k0: bigint, v1: bigint, v2: bigint, v3: bigint, v4: bigint
Project [k2#5L, k1#4L, k0#3L, v1#6L, v2#16L, v3#24L, v4#32L]
+- Join Inner, (k2#5L = k2#31L)
   :- Project [k1#4L, k0#3L, k2#5L, v1#6L, v2#16L, v3#24L]
   :  +- Join Inner, (k1#4L = k1#23L)
   :     :- Project [k0#3L, k1#4L, k2#5L, v1#6L, v2#16L]
   :     :  +- Join Inner, (k0#3L = k0#15L)
   :     :     :- Project [(id#0L % cast(10 as bigint)) AS k0#3L, (id#0L % cast(10 as bigint)) AS k1#4L, (id#0L % cast(10 as bigint)) AS k2#5L, id#0
L AS v1#6L]
   :     :     :  +- Range (0, 100, step=1, splits=Some(4))
   :     :     +- Project [id#12L AS k0#15L, id#12L AS v2#16L]
   :     :        +- Range (0, 10, step=1, splits=Some(4))
   :     +- Project [id#20L AS k1#23L, id#20L AS v3#24L]
   :        +- Range (0, 10, step=1, splits=Some(4))
   +- Project [id#28L AS k2#31L, id#28L AS v4#32L]
      +- Range (0, 10, step=1, splits=Some(4))
{code}





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