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Posted to commits@calcite.apache.org by "iwanttobepowerful (via GitHub)" <gi...@apache.org> on 2026/06/06 02:45:47 UTC
[PR] [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions [calcite]
iwanttobepowerful opened a new pull request, #4997:
URL: https://github.com/apache/calcite/pull/4997
CALCITE-7584
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Re: [PR] [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions [calcite]
Posted by "sonarqubecloud[bot] (via GitHub)" <gi...@apache.org>.
sonarqubecloud[bot] commented on PR #4997:
URL: https://github.com/apache/calcite/pull/4997#issuecomment-4637597069
## [](https://sonarcloud.io/dashboard?id=apache_calcite&pullRequest=4997) **Quality Gate passed**
Issues
 [1 New issue](https://sonarcloud.io/project/issues?id=apache_calcite&pullRequest=4997&issueStatuses=OPEN,CONFIRMED&sinceLeakPeriod=true)
 [0 Accepted issues](https://sonarcloud.io/project/issues?id=apache_calcite&pullRequest=4997&issueStatuses=ACCEPTED)
Measures
 [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=apache_calcite&pullRequest=4997&issueStatuses=OPEN,CONFIRMED&sinceLeakPeriod=true)
 [93.2% Coverage on New Code](https://sonarcloud.io/component_measures?id=apache_calcite&pullRequest=4997&metric=new_coverage&view=list)
 [0.0% Duplication on New Code](https://sonarcloud.io/component_measures?id=apache_calcite&pullRequest=4997&metric=new_duplicated_lines_density&view=list)
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Re: [PR] [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions [calcite]
Posted by "sonarqubecloud[bot] (via GitHub)" <gi...@apache.org>.
sonarqubecloud[bot] commented on PR #4997:
URL: https://github.com/apache/calcite/pull/4997#issuecomment-4639694145
## [](https://sonarcloud.io/dashboard?id=apache_calcite&pullRequest=4997) **Quality Gate passed**
Issues
 [1 New issue](https://sonarcloud.io/project/issues?id=apache_calcite&pullRequest=4997&issueStatuses=OPEN,CONFIRMED&sinceLeakPeriod=true)
 [0 Accepted issues](https://sonarcloud.io/project/issues?id=apache_calcite&pullRequest=4997&issueStatuses=ACCEPTED)
Measures
 [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=apache_calcite&pullRequest=4997&issueStatuses=OPEN,CONFIRMED&sinceLeakPeriod=true)
 [93.2% Coverage on New Code](https://sonarcloud.io/component_measures?id=apache_calcite&pullRequest=4997&metric=new_coverage&view=list)
 [0.0% Duplication on New Code](https://sonarcloud.io/component_measures?id=apache_calcite&pullRequest=4997&metric=new_duplicated_lines_density&view=list)
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Re: [PR] [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions [calcite]
Posted by "silundong (via GitHub)" <gi...@apache.org>.
silundong commented on code in PR #4997:
URL: https://github.com/apache/calcite/pull/4997#discussion_r3378630634
##########
core/src/test/resources/sql/sub-query.iq:
##########
@@ -8168,6 +8168,578 @@ SELECT deptno FROM dept WHERE 1000.00 >
!ok
+# [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions
+# Correlated LATERAL sub-query with a window expression.
+# The equality predicate between the inner and outer query must remain applied
+# after decorrelation.
+SELECT e.ename, d.deptno, d.m
+FROM emp e
+JOIN LATERAL (
+ SELECT d.deptno,
+ MAX(d.deptno + e.empno) OVER (PARTITION BY e.deptno) AS m
+ FROM dept d
+ WHERE e.deptno = d.deptno
+) d ON TRUE
+ORDER BY e.empno;
+!if (use_old_decorr) {
Review Comment:
It seems this is because the new decorrelator forgot to rewrite the ORDER BY clause in the window function. Thanks for catching this, I’ll report and fix it.
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Re: [PR] [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions [calcite]
Posted by "iwanttobepowerful (via GitHub)" <gi...@apache.org>.
iwanttobepowerful commented on code in PR #4997:
URL: https://github.com/apache/calcite/pull/4997#discussion_r3370821584
##########
core/src/test/resources/sql/sub-query.iq:
##########
@@ -8168,6 +8168,578 @@ SELECT deptno FROM dept WHERE 1000.00 >
!ok
+# [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions
+# Correlated LATERAL sub-query with a window expression.
+# The equality predicate between the inner and outer query must remain applied
+# after decorrelation.
+SELECT e.ename, d.deptno, d.m
+FROM emp e
+JOIN LATERAL (
+ SELECT d.deptno,
+ MAX(d.deptno + e.empno) OVER (PARTITION BY e.deptno) AS m
+ FROM dept d
+ WHERE e.deptno = d.deptno
+) d ON TRUE
+ORDER BY e.empno;
+!if (use_old_decorr) {
Review Comment:
```sql
SELECT e.ename, d.deptno, d.rn
FROM emp e
JOIN LATERAL (
SELECT d.deptno,
ROW_NUMBER() OVER (PARTITION BY e.deptno ORDER BY e.empno, d.deptno) AS rn
FROM dept d
WHERE e.deptno = d.deptno
) d ON TRUE
ORDER BY e.empno;
```
and
```sql
SELECT 1
FROM calcite_7584_t1 t1
WHERE t1b = (SELECT MAX(tmp.s) FROM (
SELECT SUM(t2c) OVER (PARTITION BY t2c ORDER BY t1.t1d + t2d) AS s
FROM calcite_7584_t2 t2) AS tmp);
```
failed in TOPDOWN_GENERAL_DECORRELATION
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Re: [PR] [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions [calcite]
Posted by "iwanttobepowerful (via GitHub)" <gi...@apache.org>.
iwanttobepowerful commented on code in PR #4997:
URL: https://github.com/apache/calcite/pull/4997#discussion_r3366457949
##########
core/src/test/resources/sql/sub-query.iq:
##########
@@ -8168,6 +8168,103 @@ SELECT deptno FROM dept WHERE 1000.00 >
!ok
+# [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions
+# Correlated LATERAL sub-query with a window expression.
+# The equality predicate between the inner and outer query must remain applied
+# after decorrelation.
+SELECT e.ename, d.deptno, d.m
Review Comment:
https://onecompiler.com/postgresql/44rfcax3c
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Re: [PR] [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions [calcite]
Posted by "mihaibudiu (via GitHub)" <gi...@apache.org>.
mihaibudiu commented on code in PR #4997:
URL: https://github.com/apache/calcite/pull/4997#discussion_r3368497596
##########
core/src/main/java/org/apache/calcite/sql2rel/RelDecorrelator.java:
##########
@@ -2487,6 +2502,57 @@ private DecorrelateRexShuttle(RelNode currentRel,
return fieldAccess;
}
+ /**
+ * Window operators are decorrelated similarly to aggregates. A correlated
+ * window expression is evaluated once per outer-row binding before
+ * decorrelation; after decorrelation, outer references are represented as
+ * ordinary input fields. Therefore, add those fields to the window partition
+ * keys so that the window function is still evaluated independently for
+ * each outer-row binding.
+ *
+ * <p>Implementation based on: Improving Unnesting of Complex Queries
+ *
+ * <p>3.3 Unnesting Rules
+ * (https://dl.gi.de/server/api/core/bitstreams/c1918e8c-6a87-4da2-930a-bfed289f2388/content)
+ */
+ @Override public RexNode visitOver(RexOver over) {
Review Comment:
This seems to conflict with #4998, so let's merge the other one first if it turns out to be right, so we can see the final shape of this function
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Re: [PR] [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions [calcite]
Posted by "iwanttobepowerful (via GitHub)" <gi...@apache.org>.
iwanttobepowerful commented on code in PR #4997:
URL: https://github.com/apache/calcite/pull/4997#discussion_r3366589921
##########
core/src/test/java/org/apache/calcite/test/JdbcTest.java:
##########
@@ -2583,18 +2583,9 @@ void checkMultisetQueryWithSingleColumn() {
CalciteAssert.that()
.with(CalciteAssert.Config.REGULAR)
.query(sql)
- .returnsUnordered("name=Bill; deptno=10; M=190",
- "name=Bill; deptno=30; M=190",
Review Comment:
https://onecompiler.com/postgresql/44rfh27rq
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Re: [PR] [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions [calcite]
Posted by "iwanttobepowerful (via GitHub)" <gi...@apache.org>.
iwanttobepowerful commented on code in PR #4997:
URL: https://github.com/apache/calcite/pull/4997#discussion_r3379150673
##########
core/src/test/resources/sql/sub-query.iq:
##########
@@ -8168,6 +8168,578 @@ SELECT deptno FROM dept WHERE 1000.00 >
!ok
+# [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions
+# Correlated LATERAL sub-query with a window expression.
+# The equality predicate between the inner and outer query must remain applied
+# after decorrelation.
+SELECT e.ename, d.deptno, d.m
+FROM emp e
+JOIN LATERAL (
+ SELECT d.deptno,
+ MAX(d.deptno + e.empno) OVER (PARTITION BY e.deptno) AS m
+ FROM dept d
+ WHERE e.deptno = d.deptno
+) d ON TRUE
+ORDER BY e.empno;
+!if (use_old_decorr) {
Review Comment:
@mihaibudiu maybe we can merge this pr first
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Re: [PR] [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions [calcite]
Posted by "mihaibudiu (via GitHub)" <gi...@apache.org>.
mihaibudiu commented on code in PR #4997:
URL: https://github.com/apache/calcite/pull/4997#discussion_r3376416837
##########
core/src/test/resources/sql/sub-query.iq:
##########
@@ -8168,6 +8168,578 @@ SELECT deptno FROM dept WHERE 1000.00 >
!ok
+# [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions
+# Correlated LATERAL sub-query with a window expression.
+# The equality predicate between the inner and outer query must remain applied
+# after decorrelation.
+SELECT e.ename, d.deptno, d.m
+FROM emp e
+JOIN LATERAL (
+ SELECT d.deptno,
+ MAX(d.deptno + e.empno) OVER (PARTITION BY e.deptno) AS m
+ FROM dept d
+ WHERE e.deptno = d.deptno
+) d ON TRUE
+ORDER BY e.empno;
+!if (use_old_decorr) {
Review Comment:
I have unresolved the conversation - I would let @silundong do resolve it if the answer is satisfactory
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Re: [PR] [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions [calcite]
Posted by "iwanttobepowerful (via GitHub)" <gi...@apache.org>.
iwanttobepowerful commented on code in PR #4997:
URL: https://github.com/apache/calcite/pull/4997#discussion_r3369181868
##########
core/src/main/java/org/apache/calcite/sql2rel/RelDecorrelator.java:
##########
@@ -2487,6 +2502,57 @@ private DecorrelateRexShuttle(RelNode currentRel,
return fieldAccess;
}
+ /**
+ * Window operators are decorrelated similarly to aggregates. A correlated
+ * window expression is evaluated once per outer-row binding before
+ * decorrelation; after decorrelation, outer references are represented as
+ * ordinary input fields. Therefore, add those fields to the window partition
+ * keys so that the window function is still evaluated independently for
+ * each outer-row binding.
+ *
+ * <p>Implementation based on: Improving Unnesting of Complex Queries
+ *
+ * <p>3.3 Unnesting Rules
+ * (https://dl.gi.de/server/api/core/bitstreams/c1918e8c-6a87-4da2-930a-bfed289f2388/content)
+ */
+ @Override public RexNode visitOver(RexOver over) {
Review Comment:
the two fixes are related but apply to different shuttles. This PR updates `visitOver` in `DecorrelateRexShuttle`, while #4998 updates `visitOver` in `RemoveCorrelationRexShuttle`.
I also verified that if `RemoveCorrelationForScalarAggregateRule` is disabled in `removeCorrelationViaRule()`, the #4998 fix does not seem to be needed. So #4998 appears to address the rule-based decorrelation path, whereas this PR addresses the `DecorrelateRexShuttle` path.
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Re: [PR] [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions [calcite]
Posted by "iwanttobepowerful (via GitHub)" <gi...@apache.org>.
iwanttobepowerful merged PR #4997:
URL: https://github.com/apache/calcite/pull/4997
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Re: [PR] [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions [calcite]
Posted by "silundong (via GitHub)" <gi...@apache.org>.
silundong commented on code in PR #4997:
URL: https://github.com/apache/calcite/pull/4997#discussion_r3370529524
##########
core/src/test/resources/sql/sub-query.iq:
##########
@@ -8168,6 +8168,578 @@ SELECT deptno FROM dept WHERE 1000.00 >
!ok
+# [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions
+# Correlated LATERAL sub-query with a window expression.
+# The equality predicate between the inner and outer query must remain applied
+# after decorrelation.
+SELECT e.ename, d.deptno, d.m
+FROM emp e
+JOIN LATERAL (
+ SELECT d.deptno,
+ MAX(d.deptno + e.empno) OVER (PARTITION BY e.deptno) AS m
+ FROM dept d
+ WHERE e.deptno = d.deptno
+) d ON TRUE
+ORDER BY e.empno;
+!if (use_old_decorr) {
Review Comment:
Hi, I think any execution result test (!ok) in sub-query.iq should not be guarded by `!if (use_old_decorr)` at this point, because these tests can also verify the correctness of the new decorrelator. If a specific test case still has an issue in the new decorrelator, while the old decorrelator already has a fix or is being fixed, then `!if (use_old_decorr)` can be added for that case temporarily and removed once the new decorrelator is fixed.
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Re: [PR] [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions [calcite]
Posted by "sonarqubecloud[bot] (via GitHub)" <gi...@apache.org>.
sonarqubecloud[bot] commented on PR #4997:
URL: https://github.com/apache/calcite/pull/4997#issuecomment-4646586822
## [](https://sonarcloud.io/dashboard?id=apache_calcite&pullRequest=4997) **Quality Gate passed**
Issues
 [1 New issue](https://sonarcloud.io/project/issues?id=apache_calcite&pullRequest=4997&issueStatuses=OPEN,CONFIRMED&sinceLeakPeriod=true)
 [0 Accepted issues](https://sonarcloud.io/project/issues?id=apache_calcite&pullRequest=4997&issueStatuses=ACCEPTED)
Measures
 [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=apache_calcite&pullRequest=4997&issueStatuses=OPEN,CONFIRMED&sinceLeakPeriod=true)
 [93.2% Coverage on New Code](https://sonarcloud.io/component_measures?id=apache_calcite&pullRequest=4997&metric=new_coverage&view=list)
 [0.0% Duplication on New Code](https://sonarcloud.io/component_measures?id=apache_calcite&pullRequest=4997&metric=new_duplicated_lines_density&view=list)
<!-- sqra-placement-anchor -->
[See analysis details on SonarQube Cloud](https://sonarcloud.io/dashboard?id=apache_calcite&pullRequest=4997)
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Re: [PR] [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions [calcite]
Posted by "mihaibudiu (via GitHub)" <gi...@apache.org>.
mihaibudiu commented on code in PR #4997:
URL: https://github.com/apache/calcite/pull/4997#discussion_r3383013072
##########
core/src/test/resources/sql/sub-query.iq:
##########
@@ -8168,6 +8168,103 @@ SELECT deptno FROM dept WHERE 1000.00 >
!ok
+# [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions
+# Correlated LATERAL sub-query with a window expression.
+# The equality predicate between the inner and outer query must remain applied
+# after decorrelation.
+SELECT e.ename, d.deptno, d.m
Review Comment:
This link lives only in the PR (and will eventually expire), but a comment saying "this was validated using postgres" lives in the code forever.
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Re: [PR] [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions [calcite]
Posted by "sonarqubecloud[bot] (via GitHub)" <gi...@apache.org>.
sonarqubecloud[bot] commented on PR #4997:
URL: https://github.com/apache/calcite/pull/4997#issuecomment-4638611698
## [](https://sonarcloud.io/dashboard?id=apache_calcite&pullRequest=4997) **Quality Gate passed**
Issues
 [1 New issue](https://sonarcloud.io/project/issues?id=apache_calcite&pullRequest=4997&issueStatuses=OPEN,CONFIRMED&sinceLeakPeriod=true)
 [0 Accepted issues](https://sonarcloud.io/project/issues?id=apache_calcite&pullRequest=4997&issueStatuses=ACCEPTED)
Measures
 [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=apache_calcite&pullRequest=4997&issueStatuses=OPEN,CONFIRMED&sinceLeakPeriod=true)
 [93.2% Coverage on New Code](https://sonarcloud.io/component_measures?id=apache_calcite&pullRequest=4997&metric=new_coverage&view=list)
 [0.0% Duplication on New Code](https://sonarcloud.io/component_measures?id=apache_calcite&pullRequest=4997&metric=new_duplicated_lines_density&view=list)
<!-- sqra-placement-anchor -->
[See analysis details on SonarQube Cloud](https://sonarcloud.io/dashboard?id=apache_calcite&pullRequest=4997)
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Re: [PR] [CALCITE-7584] RelDecorrelator produces incorrect results for correlated LATERAL sub-queries with window functions [calcite]
Posted by "sonarqubecloud[bot] (via GitHub)" <gi...@apache.org>.
sonarqubecloud[bot] commented on PR #4997:
URL: https://github.com/apache/calcite/pull/4997#issuecomment-4666410478
## [](https://sonarcloud.io/dashboard?id=apache_calcite&pullRequest=4997) **Quality Gate passed**
Issues
 [1 New issue](https://sonarcloud.io/project/issues?id=apache_calcite&pullRequest=4997&issueStatuses=OPEN,CONFIRMED&sinceLeakPeriod=true)
 [0 Accepted issues](https://sonarcloud.io/project/issues?id=apache_calcite&pullRequest=4997&issueStatuses=ACCEPTED)
Measures
 [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=apache_calcite&pullRequest=4997&issueStatuses=OPEN,CONFIRMED&sinceLeakPeriod=true)
 [93.2% Coverage on New Code](https://sonarcloud.io/component_measures?id=apache_calcite&pullRequest=4997&metric=new_coverage&view=list)
 [0.0% Duplication on New Code](https://sonarcloud.io/component_measures?id=apache_calcite&pullRequest=4997&metric=new_duplicated_lines_density&view=list)
<!-- sqra-placement-anchor -->
[See analysis details on SonarQube Cloud](https://sonarcloud.io/dashboard?id=apache_calcite&pullRequest=4997)
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