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Posted to reviews@spark.apache.org by wzhfy <gi...@git.apache.org> on 2017/03/18 06:31:07 UTC
[GitHub] spark pull request #17339: [SPARK-20010][SQL] Sort information is lost after...
GitHub user wzhfy opened a pull request:
https://github.com/apache/spark/pull/17339
[SPARK-20010][SQL] Sort information is lost after sort merge join
## What changes were proposed in this pull request?
After sort merge join for inner join, now we only keep left key ordering. However, after inner join, right key has the same value and order as left key. So if we need another smj on right key, we will unnecessarily add a sort which causes additional cost.
As a more complicated example, A join B on A.key = B.key join C on B.key = C.key join D on A.key = D.key. We will unnecessarily add a sort on B.key when join {A, B} and C, and add a sort on A.key when join {A, B, C} and D.
To fix this, we need to propagate all sorted information (equivalent expressions) from bottom up through `outputOrdering` and `SortOrder`.
## How was this patch tested?
Test cases are added.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wzhfy/spark sortEnhance
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17339.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #17339
----
commit f3b5b348e4c28ab795755bb099210af872a700df
Author: wangzhenhua <wa...@huawei.com>
Date: 2017-03-17T07:23:32Z
derive sorted expressions for smj
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[GitHub] spark issue #17339: [SPARK-20010][SQL] Sort information is lost after sort m...
Posted by AmplabJenkins <gi...@git.apache.org>.
Github user AmplabJenkins commented on the issue:
https://github.com/apache/spark/pull/17339
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[GitHub] spark issue #17339: [SPARK-20010][SQL] Sort information is lost after sort m...
Posted by SparkQA <gi...@git.apache.org>.
Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/17339
**[Test build #74783 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/74783/testReport)** for PR 17339 at commit [`f3b5b34`](https://github.com/apache/spark/commit/f3b5b348e4c28ab795755bb099210af872a700df).
* This patch passes all tests.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `case class SortOrder(`
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[GitHub] spark issue #17339: [SPARK-20010][SQL] Sort information is lost after sort m...
Posted by SparkQA <gi...@git.apache.org>.
Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/17339
**[Test build #74783 has started](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/74783/testReport)** for PR 17339 at commit [`f3b5b34`](https://github.com/apache/spark/commit/f3b5b348e4c28ab795755bb099210af872a700df).
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[GitHub] spark issue #17339: [SPARK-20010][SQL] Sort information is lost after sort m...
Posted by cloud-fan <gi...@git.apache.org>.
Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/17339
retest this please
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[GitHub] spark issue #17339: [SPARK-20010][SQL] Sort information is lost after sort m...
Posted by SparkQA <gi...@git.apache.org>.
Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/17339
**[Test build #74888 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/74888/testReport)** for PR 17339 at commit [`9d2ab54`](https://github.com/apache/spark/commit/9d2ab549f19427ffc71ef9cef0517c080b71e31e).
* This patch passes all tests.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `case class SortOrder(`
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[GitHub] spark pull request #17339: [SPARK-20010][SQL] Sort information is lost after...
Posted by asfgit <gi...@git.apache.org>.
Github user asfgit closed the pull request at:
https://github.com/apache/spark/pull/17339
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[GitHub] spark issue #17339: [SPARK-20010][SQL] Sort information is lost after sort m...
Posted by wzhfy <gi...@git.apache.org>.
Github user wzhfy commented on the issue:
https://github.com/apache/spark/pull/17339
test this please
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[GitHub] spark issue #17339: [SPARK-20010][SQL] Sort information is lost after sort m...
Posted by SparkQA <gi...@git.apache.org>.
Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/17339
**[Test build #74873 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/74873/testReport)** for PR 17339 at commit [`9d2ab54`](https://github.com/apache/spark/commit/9d2ab549f19427ffc71ef9cef0517c080b71e31e).
* This patch **fails Spark unit tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `case class SortOrder(`
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[GitHub] spark issue #17339: [SPARK-20010][SQL] Sort information is lost after sort m...
Posted by SparkQA <gi...@git.apache.org>.
Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/17339
**[Test build #74888 has started](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/74888/testReport)** for PR 17339 at commit [`9d2ab54`](https://github.com/apache/spark/commit/9d2ab549f19427ffc71ef9cef0517c080b71e31e).
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[GitHub] spark issue #17339: [SPARK-20010][SQL] Sort information is lost after sort m...
Posted by AmplabJenkins <gi...@git.apache.org>.
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[GitHub] spark issue #17339: [SPARK-20010][SQL] Sort information is lost after sort m...
Posted by wzhfy <gi...@git.apache.org>.
Github user wzhfy commented on the issue:
https://github.com/apache/spark/pull/17339
retest this please
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https://github.com/apache/spark/pull/17339
**[Test build #74770 has started](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/74770/testReport)** for PR 17339 at commit [`f3b5b34`](https://github.com/apache/spark/commit/f3b5b348e4c28ab795755bb099210af872a700df).
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[GitHub] spark issue #17339: [SPARK-20010][SQL] Sort information is lost after sort m...
Posted by wzhfy <gi...@git.apache.org>.
Github user wzhfy commented on the issue:
https://github.com/apache/spark/pull/17339
retest this please
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[GitHub] spark issue #17339: [SPARK-20010][SQL] Sort information is lost after sort m...
Posted by SparkQA <gi...@git.apache.org>.
Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/17339
**[Test build #74880 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/74880/testReport)** for PR 17339 at commit [`9d2ab54`](https://github.com/apache/spark/commit/9d2ab549f19427ffc71ef9cef0517c080b71e31e).
* This patch **fails Spark unit tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `case class SortOrder(`
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Posted by AmplabJenkins <gi...@git.apache.org>.
Github user AmplabJenkins commented on the issue:
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[GitHub] spark issue #17339: [SPARK-20010][SQL] Sort information is lost after sort m...
Posted by cloud-fan <gi...@git.apache.org>.
Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/17339
thanks, merging to master!
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[GitHub] spark issue #17339: [SPARK-20010][SQL] Sort information is lost after sort m...
Posted by wzhfy <gi...@git.apache.org>.
Github user wzhfy commented on the issue:
https://github.com/apache/spark/pull/17339
cc @cloud-fan @hvanhovell
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[GitHub] spark issue #17339: [SPARK-20010][SQL] Sort information is lost after sort m...
Posted by SparkQA <gi...@git.apache.org>.
Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/17339
**[Test build #74873 has started](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/74873/testReport)** for PR 17339 at commit [`9d2ab54`](https://github.com/apache/spark/commit/9d2ab549f19427ffc71ef9cef0517c080b71e31e).
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[GitHub] spark pull request #17339: [SPARK-20010][SQL] Sort information is lost after...
Posted by cloud-fan <gi...@git.apache.org>.
Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17339#discussion_r106873344
--- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/SortOrder.scala ---
@@ -53,8 +53,15 @@ case object NullsLast extends NullOrdering{
/**
* An expression that can be used to sort a tuple. This class extends expression primarily so that
* transformations over expression will descend into its child.
+ * `sameOrderExpressions` is a set of expressions with the same sort order as the child. It is
+ * derived from equivalence relation in an operator, e.g. left/right keys of an inner sort merge
+ * join.
*/
-case class SortOrder(child: Expression, direction: SortDirection, nullOrdering: NullOrdering)
+case class SortOrder(
+ child: Expression,
+ direction: SortDirection,
+ nullOrdering: NullOrdering,
+ sameOrderExpressions: Set[Expression])
--- End diff --
Ideally we don't need this, and we can rely on `EqualTo` constraint to infer this information. Unfortunately the constraint only exists in logical plan, so we can't find a better solution for this case. cc @gatorsmile do you have a better idea?
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[GitHub] spark issue #17339: [SPARK-20010][SQL] Sort information is lost after sort m...
Posted by SparkQA <gi...@git.apache.org>.
Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/17339
**[Test build #74880 has started](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/74880/testReport)** for PR 17339 at commit [`9d2ab54`](https://github.com/apache/spark/commit/9d2ab549f19427ffc71ef9cef0517c080b71e31e).
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