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new 6a4488f2f48 [SPARK-45580][SQL][3.3] Handle case where a nested
subquery becomes an existence join
6a4488f2f48 is described below
commit 6a4488f2f4861df41025480cceda643e9e74484e
Author: Bruce Robbins <bersprock...@gmail.com>
AuthorDate: Wed Dec 6 19:24:13 2023 -0800
[SPARK-45580][SQL][3.3] Handle case where a nested subquery becomes an
existence join
### What changes were proposed in this pull request?
This is a back-port of https://github.com/apache/spark/pull/44193.
In `RewritePredicateSubquery`, prune existence flags from the final join
when `rewriteExistentialExpr` returns an existence join. This change prunes the
flags (attributes with the name "exists") by adding a `Project` node.
For example:
```
Join LeftSemi, ((a#13 = c1#15) OR exists#19)
:- Join ExistenceJoin(exists#19), (a#13 = col1#17)
: :- LocalRelation [a#13]
: +- LocalRelation [col1#17]
+- LocalRelation [c1#15]
```
becomes
```
Project [a#13]
+- Join LeftSemi, ((a#13 = c1#15) OR exists#19)
:- Join ExistenceJoin(exists#19), (a#13 = col1#17)
: :- LocalRelation [a#13]
: +- LocalRelation [col1#17]
+- LocalRelation [c1#15]
```
This change always adds the `Project` node, whether
`rewriteExistentialExpr` returns an existence join or not. In the case when
`rewriteExistentialExpr` does not return an existence join,
`RemoveNoopOperators` will remove the unneeded `Project` node.
### Why are the changes needed?
This query returns an extraneous boolean column when run in spark-sql:
```
create or replace temp view t1(a) as values (1), (2), (3), (7);
create or replace temp view t2(c1) as values (1), (2), (3);
create or replace temp view t3(col1) as values (3), (9);
select *
from t1
where exists (
select c1
from t2
where a = c1
or a in (select col1 from t3)
);
1 false
2 false
3 true
```
(Note: the above query will not have the extraneous boolean column when run
from the Dataset API. That is because the Dataset API truncates the rows based
on the schema of the analyzed plan. The bug occurs during optimization).
This query fails when run in either spark-sql or using the Dataset API:
```
select (
select *
from t1
where exists (
select c1
from t2
where a = c1
or a in (select col1 from t3)
)
limit 1
)
from range(1);
java.lang.AssertionError: assertion failed: Expects 1 field, but got 2;
something went wrong in analysis
```
### Does this PR introduce _any_ user-facing change?
No, except for the removal of the extraneous boolean flag and the fix to
the error condition.
### How was this patch tested?
New unit test.
### Was this patch authored or co-authored using generative AI tooling?
No.
Closes #44223 from bersprockets/schema_change_br33.
Authored-by: Bruce Robbins <bersprock...@gmail.com>
Signed-off-by: Dongjoon Hyun <dh...@apple.com>
---
.../spark/sql/catalyst/optimizer/subquery.scala | 9 +++--
.../scala/org/apache/spark/sql/SubquerySuite.scala | 46 ++++++++++++++++++++++
2 files changed, 52 insertions(+), 3 deletions(-)
diff --git
a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/subquery.scala
b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/subquery.scala
index 7ef5ef55fab..ff198c798b9 100644
---
a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/subquery.scala
+++
b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/subquery.scala
@@ -113,16 +113,19 @@ object RewritePredicateSubquery extends Rule[LogicalPlan]
with PredicateHelper {
withSubquery.foldLeft(newFilter) {
case (p, Exists(sub, _, _, conditions)) =>
val (joinCond, outerPlan) = rewriteExistentialExpr(conditions, p)
- buildJoin(outerPlan, sub, LeftSemi, joinCond)
+ val join = buildJoin(outerPlan, sub, LeftSemi, joinCond)
+ Project(p.output, join)
case (p, Not(Exists(sub, _, _, conditions))) =>
val (joinCond, outerPlan) = rewriteExistentialExpr(conditions, p)
- buildJoin(outerPlan, sub, LeftAnti, joinCond)
+ val join = buildJoin(outerPlan, sub, LeftAnti, joinCond)
+ Project(p.output, join)
case (p, InSubquery(values, ListQuery(sub, _, _, _, conditions))) =>
// Deduplicate conflicting attributes if any.
val newSub = dedupSubqueryOnSelfJoin(p, sub, Some(values))
val inConditions = values.zip(newSub.output).map(EqualTo.tupled)
val (joinCond, outerPlan) = rewriteExistentialExpr(inConditions ++
conditions, p)
- Join(outerPlan, newSub, LeftSemi, joinCond, JoinHint.NONE)
+ val join = Join(outerPlan, newSub, LeftSemi, joinCond, JoinHint.NONE)
+ Project(p.output, join)
case (p, Not(InSubquery(values, ListQuery(sub, _, _, _, conditions))))
=>
// This is a NULL-aware (left) anti join (NAAJ) e.g. col NOT IN expr
// Construct the condition. A NULL in one of the conditions is
regarded as a positive
diff --git a/sql/core/src/test/scala/org/apache/spark/sql/SubquerySuite.scala
b/sql/core/src/test/scala/org/apache/spark/sql/SubquerySuite.scala
index b3aefac05b1..219d7504246 100644
--- a/sql/core/src/test/scala/org/apache/spark/sql/SubquerySuite.scala
+++ b/sql/core/src/test/scala/org/apache/spark/sql/SubquerySuite.scala
@@ -2316,4 +2316,50 @@ class SubquerySuite extends QueryTest with
SharedSparkSession with AdaptiveSpark
}
}
}
+
+ test("SPARK-45580: Handle case where a nested subquery becomes an existence
join") {
+ withTempView("t1", "t2", "t3") {
+ Seq((1), (2), (3), (7)).toDF("a").persist().createOrReplaceTempView("t1")
+ Seq((1), (2), (3)).toDF("c1").persist().createOrReplaceTempView("t2")
+ Seq((3), (9)).toDF("col1").persist().createOrReplaceTempView("t3")
+
+ val query1 =
+ """
+ |SELECT *
+ |FROM t1
+ |WHERE EXISTS (
+ | SELECT c1
+ | FROM t2
+ | WHERE a = c1
+ | OR a IN (SELECT col1 FROM t3)
+ |)""".stripMargin
+ val df1 = sql(query1)
+ checkAnswer(df1, Row(1) :: Row(2) :: Row(3) :: Nil)
+
+ val query2 =
+ """
+ |SELECT *
+ |FROM t1
+ |WHERE a IN (
+ | SELECT c1
+ | FROM t2
+ | where a IN (SELECT col1 FROM t3)
+ |)""".stripMargin
+ val df2 = sql(query2)
+ checkAnswer(df2, Row(3))
+
+ val query3 =
+ """
+ |SELECT *
+ |FROM t1
+ |WHERE NOT EXISTS (
+ | SELECT c1
+ | FROM t2
+ | WHERE a = c1
+ | OR a IN (SELECT col1 FROM t3)
+ |)""".stripMargin
+ val df3 = sql(query3)
+ checkAnswer(df3, Row(7))
+ }
+ }
}
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