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The following commit(s) were added to refs/heads/branch-3.0 by this push:
new 12eb9c37e1b [fix](Nerieds) column prune should retain at least one
column for union all (#41613) (#41909)
12eb9c37e1b is described below
commit 12eb9c37e1b4255733197cfec1359a443b8fe60b
Author: feiniaofeiafei <[email protected]>
AuthorDate: Thu Oct 24 21:01:51 2024 +0800
[fix](Nerieds) column prune should retain at least one column for union all
(#41613) (#41909)
introduce by #31811 and #39450
```sql
select count(1) from(select 3, 6 union all select 1, 3) t
```
wrong LogicalUnion plan:
```sql
LogicalUnion( qualifier=ALL, outputs=[3#6], regularChildrenOutputs=[],
constantExprsList=[[], []], hasPushedFilter=false
```
this sql will report error in explain, because the logical union outputs
has a slot, but the logical union has no child and has a empty
constantExprList, which is wrong set in column prune.
this pr fixes it by consider when require columns is empty and keep the min
slot and min slot corresponding const expressions.
---
.../doris/nereids/rules/rewrite/ColumnPruning.java | 22 ++++++++++-----------
.../union_const_expr_column_pruning.groovy | 23 ++++++++++++++++++++++
2 files changed, 34 insertions(+), 11 deletions(-)
diff --git
a/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/ColumnPruning.java
b/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/ColumnPruning.java
index d480c203f29..7daeef24019 100644
---
a/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/ColumnPruning.java
+++
b/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/ColumnPruning.java
@@ -353,17 +353,6 @@ public class ColumnPruning extends
DefaultPlanRewriter<PruneContext> implements
extractColumnIndex.add(i);
}
}
- int len = extractColumnIndex.size();
- ImmutableList.Builder<List<NamedExpression>> prunedConstantExprsList
- =
ImmutableList.builderWithExpectedSize(constantExprsList.size());
- for (List<NamedExpression> row : constantExprsList) {
- ImmutableList.Builder<NamedExpression> newRow =
ImmutableList.builderWithExpectedSize(len);
- for (int idx : extractColumnIndex) {
- newRow.add(row.get(idx));
- }
- prunedConstantExprsList.add(newRow.build());
- }
-
if (prunedOutputs.isEmpty()) {
List<NamedExpression> candidates =
Lists.newArrayList(originOutput);
candidates.retainAll(keys);
@@ -372,8 +361,19 @@ public class ColumnPruning extends
DefaultPlanRewriter<PruneContext> implements
}
NamedExpression minimumColumn =
ExpressionUtils.selectMinimumColumn(candidates);
prunedOutputs = ImmutableList.of(minimumColumn);
+ extractColumnIndex.add(originOutput.indexOf(minimumColumn));
}
+ int len = extractColumnIndex.size();
+ ImmutableList.Builder<List<NamedExpression>> prunedConstantExprsList
+ =
ImmutableList.builderWithExpectedSize(constantExprsList.size());
+ for (List<NamedExpression> row : constantExprsList) {
+ ImmutableList.Builder<NamedExpression> newRow =
ImmutableList.builderWithExpectedSize(len);
+ for (int idx : extractColumnIndex) {
+ newRow.add(row.get(idx));
+ }
+ prunedConstantExprsList.add(newRow.build());
+ }
if (prunedOutputs.equals(originOutput)) {
return union;
} else {
diff --git
a/regression-test/suites/nereids_rules_p0/column_pruning/union_const_expr_column_pruning.groovy
b/regression-test/suites/nereids_rules_p0/column_pruning/union_const_expr_column_pruning.groovy
new file mode 100644
index 00000000000..77d62a21899
--- /dev/null
+++
b/regression-test/suites/nereids_rules_p0/column_pruning/union_const_expr_column_pruning.groovy
@@ -0,0 +1,23 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+suite("const_expr_column_pruning") {
+ sql """SET ignore_shape_nodes='PhysicalDistribute,PhysicalProject'"""
+ // should only keep one column in union
+ sql "select count(1) from(select 3, 6 union all select 1, 3) t"
+ sql "select count(a) from(select 3 a, 6 union all select 1, 3) t"
+}
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