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Posted to reviews@spark.apache.org by "TongWei1105 (via GitHub)" <gi...@apache.org> on 2023/07/17 08:47:23 UTC
[GitHub] [spark] TongWei1105 opened a new pull request, #42038: SPARK-42500: ConstantPropagation support more case
TongWei1105 opened a new pull request, #42038:
URL: https://github.com/apache/spark/pull/42038
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### What changes were proposed in this pull request?
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This PR enhances ConstantPropagation to support more cases.
Propagated through other binary comparisons.
Propagated across equality comparisons. This can be further optimized to false.
### Why are the changes needed?
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1. If you propose a new API, clarify the use case for a new API.
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Improve query performance. [Denodo](https://community.denodo.com/docs/html/browse/latest/en/vdp/administration/optimizing_queries/automatic_simplification_of_queries/removing_redundant_branches_of_queries_partitioned_unions) also has a similar optimization. For example:
```
CREATE TABLE t1(a int, b int) using parquet;
CREATE TABLE t2(x int, y int) using parquet;
CREATE TEMP VIEW v1 AS
SELECT * FROM t1 JOIN t2 WHERE a = x AND a = 0
UNION ALL
SELECT * FROM t1 JOIN t2 WHERE a = x AND (a IS NULL OR a <> 0);
SELECT * FROM v1 WHERE x > 1;
```
Before this PR:
```
== Optimized Logical Plan ==
Union false, false
:- Project [a#0 AS a#12, b#1 AS b#13, x#2 AS x#14, y#3 AS y#15]
: +- Join Inner
: :- Filter (isnotnull(a#0) AND (a#0 = 0))
: : +- Relation spark_catalog.default.t1[a#0,b#1] parquet
: +- Filter (isnotnull(x#2) AND ((0 = x#2) AND (x#2 > 1)))
: +- Relation spark_catalog.default.t2[x#2,y#3] parquet
+- Join Inner, (a#16 = x#18)
:- Filter ((isnull(a#16) OR NOT (a#16 = 0)) AND ((a#16 > 1) AND isnotnull(a#16)))
: +- Relation spark_catalog.default.t1[a#16,b#17] parquet
+- Filter ((isnotnull(x#18) AND (x#18 > 1)) AND (isnull(x#18) OR NOT (x#18 = 0)))
+- Relation spark_catalog.default.t2[x#18,y#19] parquet
```
After this PR:
```
== Optimized Logical Plan ==
Join Inner, (a#16 = x#18)
:- Filter ((isnull(a#16) OR NOT (a#16 = 0)) AND ((a#16 > 1) AND isnotnull(a#16)))
: +- Relation spark_catalog.default.t1[a#16,b#17] parquet
+- Filter ((isnotnull(x#18) AND (x#18 > 1)) AND (isnull(x#18) OR NOT (x#18 = 0)))
+- Relation spark_catalog.default.t2[x#18,y#19] parquet
```
### Does this PR introduce _any_ user-facing change?
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No.
### How was this patch tested?
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Unit test.
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[GitHub] [spark] wangyum commented on pull request #42038: [SPARK-42500][SQL] ConstantPropagation support more case
Posted by "wangyum (via GitHub)" <gi...@apache.org>.
wangyum commented on PR #42038:
URL: https://github.com/apache/spark/pull/42038#issuecomment-1637654507
cc @cloud-fan @peter-toth
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[GitHub] [spark] wangyum closed pull request #42038: [SPARK-42500][SQL] ConstantPropagation support more case
Posted by "wangyum (via GitHub)" <gi...@apache.org>.
wangyum closed pull request #42038: [SPARK-42500][SQL] ConstantPropagation support more case
URL: https://github.com/apache/spark/pull/42038
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[GitHub] [spark] wangyum commented on pull request #42038: [SPARK-42500][SQL] ConstantPropagation support more case
Posted by "wangyum (via GitHub)" <gi...@apache.org>.
wangyum commented on PR #42038:
URL: https://github.com/apache/spark/pull/42038#issuecomment-1666892655
@peter-toth This map should usually be small. This change is small and easy to maintain.
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[GitHub] [spark] peter-toth commented on pull request #42038: [SPARK-42500][SQL] ConstantPropagation support more case
Posted by "peter-toth (via GitHub)" <gi...@apache.org>.
peter-toth commented on PR #42038:
URL: https://github.com/apache/spark/pull/42038#issuecomment-1637725994
I think this PR is very similar to my https://github.com/apache/spark/pull/40268 so I'm fine with this this change.
But my PR uses a mutable map to avoid the might be costly `val equalityPredicates = equalityPredicatesLeft ++ equalityPredicatesRight` map addition so please consider that PR too.
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[GitHub] [spark] wangyum commented on pull request #42038: [SPARK-42500][SQL] ConstantPropagation support more case
Posted by "wangyum (via GitHub)" <gi...@apache.org>.
wangyum commented on PR #42038:
URL: https://github.com/apache/spark/pull/42038#issuecomment-1666894989
Merged to master.
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