github-actions[bot] commented on code in PR #65472:
URL: https://github.com/apache/doris/pull/65472#discussion_r3586379572


##########
fe/fe-core/src/test/java/org/apache/doris/nereids/rules/rewrite/PullUpJoinFromUnionAllTest.java:
##########
@@ -0,0 +1,458 @@
+// 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.
+
+package org.apache.doris.nereids.rules.rewrite;
+
+import org.apache.doris.analysis.TableScanParams;
+import org.apache.doris.analysis.TableSnapshot;
+import org.apache.doris.catalog.Column;
+import org.apache.doris.catalog.KeysType;
+import org.apache.doris.catalog.OdbcTable;
+import org.apache.doris.catalog.OlapTable;
+import org.apache.doris.catalog.Type;
+import org.apache.doris.catalog.stream.OlapTableStreamWrapper;
+import org.apache.doris.catalog.stream.StreamReadMode;
+import org.apache.doris.common.Pair;
+import org.apache.doris.datasource.ExternalTable;
+import org.apache.doris.nereids.trees.expressions.Alias;
+import org.apache.doris.nereids.trees.expressions.EqualTo;
+import org.apache.doris.nereids.trees.expressions.Expression;
+import org.apache.doris.nereids.trees.expressions.NamedExpression;
+import org.apache.doris.nereids.trees.expressions.Slot;
+import org.apache.doris.nereids.trees.expressions.SlotReference;
+import org.apache.doris.nereids.trees.plans.JoinType;
+import org.apache.doris.nereids.trees.plans.Plan;
+import org.apache.doris.nereids.trees.plans.RelationId;
+import org.apache.doris.nereids.trees.plans.algebra.SetOperation.Qualifier;
+import org.apache.doris.nereids.trees.plans.logical.LogicalFileScan;
+import org.apache.doris.nereids.trees.plans.logical.LogicalFilter;
+import org.apache.doris.nereids.trees.plans.logical.LogicalJoin;
+import org.apache.doris.nereids.trees.plans.logical.LogicalOdbcScan;
+import org.apache.doris.nereids.trees.plans.logical.LogicalOlapScan;
+import org.apache.doris.nereids.trees.plans.logical.LogicalOlapTableStreamScan;
+import org.apache.doris.nereids.trees.plans.logical.LogicalProject;
+import org.apache.doris.nereids.trees.plans.logical.LogicalSchemaScan;
+import org.apache.doris.nereids.trees.plans.logical.LogicalTestScan;
+import org.apache.doris.nereids.trees.plans.logical.LogicalUnion;
+import org.apache.doris.nereids.util.MemoTestUtils;
+import org.apache.doris.nereids.util.PlanChecker;
+import org.apache.doris.nereids.util.PlanConstructor;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableSet;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Optional;
+
+class PullUpJoinFromUnionAllTest {
+
+    @Test
+    void comparatorRejectsDifferentProjectOutputSizes() {
+        LogicalOlapScan smallScan = newScan(1, "common_small");
+        LogicalOlapScan largeScan = newScan(1, "common_large");
+        LogicalProject<LogicalOlapScan> smallProject = 
project(selectSlots(smallScan.getOutput(), 0), smallScan);
+        LogicalProject<LogicalOlapScan> largeProject = 
project(selectSlots(largeScan.getOutput(), 0, 1), largeScan);
+
+        PullUpJoinFromUnionAll.LogicalPlanComparator comparator =
+                new PullUpJoinFromUnionAll().new LogicalPlanComparator();
+        Assertions.assertFalse(comparator.isLogicalEqual(largeProject, 
smallProject));
+    }
+
+    @Test
+    void comparatorRejectsDifferentFilterChildOutputSizes() {
+        LogicalFilter<LogicalOlapScan> smallFilter = 
filter(newCachedOutputScan(1, "common_filter", 0));
+        LogicalFilter<LogicalOlapScan> largeFilter = 
filter(newCachedOutputScan(1, "common_filter", 0, 1));
+
+        PullUpJoinFromUnionAll.LogicalPlanComparator comparator =
+                new PullUpJoinFromUnionAll().new LogicalPlanComparator();
+        Assertions.assertFalse(comparator.isLogicalEqual(largeFilter, 
smallFilter));
+    }
+
+    @Test
+    void comparatorRejectsDifferentMaterializedIndexSelections() {
+        PullUpJoinFromUnionAll.LogicalPlanComparator comparator =
+                new PullUpJoinFromUnionAll().new LogicalPlanComparator();
+        LogicalOlapScan baseScan = newScanWithExtraIndex(11, "common_index", 
101);
+        LogicalOlapScan indexScan = 
baseScan.withMaterializedIndexSelected(101);
+
+        Assertions.assertFalse(comparator.isLogicalEqual(baseScan, indexScan));
+    }
+
+    @Test
+    void comparatorRejectsDifferentManuallySpecifiedPartitions() {
+        LogicalOlapScan firstPartitionScan = 
PlanConstructor.newLogicalOlapScanWithSameId(

Review Comment:
   This test still does not exercise the `selectedPartitionIds` comparison. 
`newLogicalOlapScanWithSameId()` passes these ids as specified partitions, but 
the test table has no real partitions, and `LogicalOlapScan` filters selected 
ids to partitions that exist. Both scans therefore end up with empty 
`selectedPartitionIds`, so this assertion only proves 
`manuallySpecifiedPartitions` differs. Please add a case with real partitions, 
or otherwise construct scans whose selected partition ids remain `1` vs `2` 
while the manual partition list is the same, so the pruned partition-scope 
guard is covered directly.



##########
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/plans/logical/LogicalFileScan.java:
##########
@@ -197,6 +197,15 @@ public boolean equals(Object o) {
         return super.equals(o) && Objects.equals(selectedPartitions, 
((LogicalFileScan) o).selectedPartitions);
     }
 
+    @Override
+    protected boolean hasSameScanState(LogicalCatalogRelation other) {

Review Comment:
   This comparator is also used by `LogicalHudiScan`, which inherits 
`LogicalFileScan.hasSameScanState()`, but Hudi scans carry an additional 
resolved `incrementalRelation`. Raw `scanParams` are not enough here: 
`withScanParams()` resolves missing/`latest` end instants and chooses an 
Empty/COW/MOR incremental relation from the current Hudi timeline, and the 
physical Hudi scan forwards that relation to `HudiScanNode` for split selection 
and fallback behavior. If two same-table Hudi incremental branches have the 
same raw params but different resolved incremental relation state, this rewrite 
can keep only the first common scan. Please override `hasSameScanState()` in 
`LogicalHudiScan` to include the effective incremental relation state, or 
conservatively reject Hudi scans from this common-side match.



##########
fe/fe-core/src/test/java/org/apache/doris/nereids/rules/rewrite/PullUpJoinFromUnionAllTest.java:
##########
@@ -0,0 +1,458 @@
+// 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.
+
+package org.apache.doris.nereids.rules.rewrite;
+
+import org.apache.doris.analysis.TableScanParams;
+import org.apache.doris.analysis.TableSnapshot;
+import org.apache.doris.catalog.Column;
+import org.apache.doris.catalog.KeysType;
+import org.apache.doris.catalog.OdbcTable;
+import org.apache.doris.catalog.OlapTable;
+import org.apache.doris.catalog.Type;
+import org.apache.doris.catalog.stream.OlapTableStreamWrapper;
+import org.apache.doris.catalog.stream.StreamReadMode;
+import org.apache.doris.common.Pair;
+import org.apache.doris.datasource.ExternalTable;
+import org.apache.doris.nereids.trees.expressions.Alias;
+import org.apache.doris.nereids.trees.expressions.EqualTo;
+import org.apache.doris.nereids.trees.expressions.Expression;
+import org.apache.doris.nereids.trees.expressions.NamedExpression;
+import org.apache.doris.nereids.trees.expressions.Slot;
+import org.apache.doris.nereids.trees.expressions.SlotReference;
+import org.apache.doris.nereids.trees.plans.JoinType;
+import org.apache.doris.nereids.trees.plans.Plan;
+import org.apache.doris.nereids.trees.plans.RelationId;
+import org.apache.doris.nereids.trees.plans.algebra.SetOperation.Qualifier;
+import org.apache.doris.nereids.trees.plans.logical.LogicalFileScan;
+import org.apache.doris.nereids.trees.plans.logical.LogicalFilter;
+import org.apache.doris.nereids.trees.plans.logical.LogicalJoin;
+import org.apache.doris.nereids.trees.plans.logical.LogicalOdbcScan;
+import org.apache.doris.nereids.trees.plans.logical.LogicalOlapScan;
+import org.apache.doris.nereids.trees.plans.logical.LogicalOlapTableStreamScan;
+import org.apache.doris.nereids.trees.plans.logical.LogicalProject;
+import org.apache.doris.nereids.trees.plans.logical.LogicalSchemaScan;
+import org.apache.doris.nereids.trees.plans.logical.LogicalTestScan;
+import org.apache.doris.nereids.trees.plans.logical.LogicalUnion;
+import org.apache.doris.nereids.util.MemoTestUtils;
+import org.apache.doris.nereids.util.PlanChecker;
+import org.apache.doris.nereids.util.PlanConstructor;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableSet;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Optional;
+
+class PullUpJoinFromUnionAllTest {
+
+    @Test
+    void comparatorRejectsDifferentProjectOutputSizes() {
+        LogicalOlapScan smallScan = newScan(1, "common_small");
+        LogicalOlapScan largeScan = newScan(1, "common_large");
+        LogicalProject<LogicalOlapScan> smallProject = 
project(selectSlots(smallScan.getOutput(), 0), smallScan);
+        LogicalProject<LogicalOlapScan> largeProject = 
project(selectSlots(largeScan.getOutput(), 0, 1), largeScan);
+
+        PullUpJoinFromUnionAll.LogicalPlanComparator comparator =
+                new PullUpJoinFromUnionAll().new LogicalPlanComparator();
+        Assertions.assertFalse(comparator.isLogicalEqual(largeProject, 
smallProject));
+    }
+
+    @Test
+    void comparatorRejectsDifferentFilterChildOutputSizes() {
+        LogicalFilter<LogicalOlapScan> smallFilter = 
filter(newCachedOutputScan(1, "common_filter", 0));
+        LogicalFilter<LogicalOlapScan> largeFilter = 
filter(newCachedOutputScan(1, "common_filter", 0, 1));
+
+        PullUpJoinFromUnionAll.LogicalPlanComparator comparator =
+                new PullUpJoinFromUnionAll().new LogicalPlanComparator();
+        Assertions.assertFalse(comparator.isLogicalEqual(largeFilter, 
smallFilter));
+    }
+
+    @Test
+    void comparatorRejectsDifferentMaterializedIndexSelections() {
+        PullUpJoinFromUnionAll.LogicalPlanComparator comparator =
+                new PullUpJoinFromUnionAll().new LogicalPlanComparator();
+        LogicalOlapScan baseScan = newScanWithExtraIndex(11, "common_index", 
101);
+        LogicalOlapScan indexScan = 
baseScan.withMaterializedIndexSelected(101);
+
+        Assertions.assertFalse(comparator.isLogicalEqual(baseScan, indexScan));
+    }
+
+    @Test
+    void comparatorRejectsDifferentManuallySpecifiedPartitions() {
+        LogicalOlapScan firstPartitionScan = 
PlanConstructor.newLogicalOlapScanWithSameId(
+                12, "common_partition", 0, ImmutableList.of(1L));
+        LogicalOlapScan secondPartitionScan = 
PlanConstructor.newLogicalOlapScanWithSameId(
+                12, "common_partition", 0, ImmutableList.of(2L));
+
+        PullUpJoinFromUnionAll.LogicalPlanComparator comparator =
+                new PullUpJoinFromUnionAll().new LogicalPlanComparator();
+        Assertions.assertFalse(comparator.isLogicalEqual(firstPartitionScan, 
secondPartitionScan));
+    }
+
+    @Test
+    void comparatorRejectsDifferentTableSamples() {
+        LogicalOlapScan sampleOneScan = newScanWithTableSample(43, 
"common_sample",
+                new org.apache.doris.nereids.trees.TableSample(10, true, 0));
+        LogicalOlapScan sampleTwoScan = newScanWithTableSample(43, 
"common_sample",
+                new org.apache.doris.nereids.trees.TableSample(20, true, 0));
+
+        PullUpJoinFromUnionAll.LogicalPlanComparator comparator =
+                new PullUpJoinFromUnionAll().new LogicalPlanComparator();
+        Assertions.assertFalse(comparator.isLogicalEqual(sampleOneScan, 
sampleTwoScan));
+    }
+
+    @Test
+    void comparatorRejectsDifferentOlapScanParams() {
+        LogicalOlapScan incrementalScan = newScanWithScanParams(44, 
"common_params",
+                new TableScanParams(TableScanParams.INCREMENTAL_READ,
+                        ImmutableMap.of("end_ts", "10"), ImmutableList.of()));
+        LogicalOlapScan differentIncrementalScan = newScanWithScanParams(44, 
"common_params",
+                new TableScanParams(TableScanParams.INCREMENTAL_READ,
+                        ImmutableMap.of("end_ts", "20"), ImmutableList.of()));
+
+        PullUpJoinFromUnionAll.LogicalPlanComparator comparator =
+                new PullUpJoinFromUnionAll().new LogicalPlanComparator();
+        Assertions.assertFalse(comparator.isLogicalEqual(incrementalScan, 
differentIncrementalScan));
+    }
+
+    @Test
+    void comparatorRejectsDifferentStreamReadModes() {
+        LogicalOlapTableStreamScan snapshotScan = newStreamScanWithOffsets(15, 
"common_stream", 1000L, 2000L,
+                KeysType.UNIQUE_KEYS, ImmutableMap.of(1L, Pair.of(10L, 20L)))
+                .withReadMode(StreamReadMode.SNAPSHOT);
+        LogicalOlapTableStreamScan resetScan = 
snapshotScan.withReadMode(StreamReadMode.RESET);
+
+        PullUpJoinFromUnionAll.LogicalPlanComparator comparator =
+                new PullUpJoinFromUnionAll().new LogicalPlanComparator();
+        Assertions.assertFalse(comparator.isLogicalEqual(snapshotScan, 
resetScan));
+    }
+
+    @Test
+    void comparatorRejectsDifferentStreamOffsets() {
+        LogicalOlapTableStreamScan left = newStreamScanWithOffsets(45, 
"common_stream_offset", 1000L, 2000L,
+                KeysType.UNIQUE_KEYS, ImmutableMap.of(1L, Pair.of(10L, 20L)));
+        LogicalOlapTableStreamScan right = newStreamScanWithOffsets(45, 
"common_stream_offset", 1000L, 2000L,
+                KeysType.UNIQUE_KEYS, ImmutableMap.of(1L, Pair.of(30L, 40L)));
+
+        PullUpJoinFromUnionAll.LogicalPlanComparator comparator =
+                new PullUpJoinFromUnionAll().new LogicalPlanComparator();
+        Assertions.assertFalse(comparator.isLogicalEqual(left, right));
+    }
+
+    @Test
+    void comparatorRejectsDifferentStreamKeysTypes() {
+        LogicalOlapTableStreamScan uniqueKeyScan = 
newStreamScanWithOffsets(46, "common_stream_keys", 1000L, 2000L,
+                KeysType.UNIQUE_KEYS, ImmutableMap.of(1L, Pair.of(10L, 20L)));
+        LogicalOlapTableStreamScan dupKeyScan = newStreamScanWithOffsets(46, 
"common_stream_keys", 1000L, 2000L,
+                KeysType.DUP_KEYS, ImmutableMap.of(1L, Pair.of(10L, 20L)));
+
+        PullUpJoinFromUnionAll.LogicalPlanComparator comparator =
+                new PullUpJoinFromUnionAll().new LogicalPlanComparator();
+        Assertions.assertFalse(comparator.isLogicalEqual(uniqueKeyScan, 
dupKeyScan));
+    }
+
+    @Test
+    void comparatorRejectsDifferentStreamIdentities() {
+        LogicalOlapTableStreamScan left = newStreamScanWithOffsets(47, 
"common_stream_identity", 1000L, 2000L,
+                KeysType.UNIQUE_KEYS, ImmutableMap.of(1L, Pair.of(10L, 20L)));
+        LogicalOlapTableStreamScan right = newStreamScanWithOffsets(47, 
"common_stream_identity", 1000L, 3000L,
+                KeysType.UNIQUE_KEYS, ImmutableMap.of(1L, Pair.of(10L, 20L)));
+
+        PullUpJoinFromUnionAll.LogicalPlanComparator comparator =
+                new PullUpJoinFromUnionAll().new LogicalPlanComparator();
+        Assertions.assertFalse(comparator.isLogicalEqual(left, right));
+    }
+
+    @Test
+    void comparatorRejectsDifferentFileScanSnapshots() {
+        LogicalFileScan versionOneScan = newFileScan(17L, 
TableSnapshot.versionOf("1"));
+        LogicalFileScan versionTwoScan = newFileScan(17L, 
TableSnapshot.versionOf("2"));
+
+        PullUpJoinFromUnionAll.LogicalPlanComparator comparator =
+                new PullUpJoinFromUnionAll().new LogicalPlanComparator();
+        Assertions.assertFalse(comparator.isLogicalEqual(versionOneScan, 
versionTwoScan));
+    }
+
+    @Test
+    void comparatorRejectsDifferentSchemaScanConjuncts() {
+        LogicalSchemaScan baseScan = newSchemaScan(16, "schema_common");
+        LogicalSchemaScan filteredScan = 
baseScan.withFrontendConjuncts(Optional.of("ctl"),
+                Optional.of("db"), Optional.of("tbl"),
+                ImmutableList.of(new EqualTo(baseScan.getOutput().get(0), 
baseScan.getOutput().get(1))));
+
+        PullUpJoinFromUnionAll.LogicalPlanComparator comparator =
+                new PullUpJoinFromUnionAll().new LogicalPlanComparator();
+        Assertions.assertFalse(comparator.isLogicalEqual(baseScan, 
filteredScan));
+    }
+
+    @Test
+    void comparatorAcceptsSameOdbcScanWithDifferentRelationIds() {
+        LogicalOdbcScan left = newOdbcScan(18L, "odbc_common");
+        LogicalOdbcScan right = 
left.withRelationId(PlanConstructor.getNextRelationId());
+
+        PullUpJoinFromUnionAll.LogicalPlanComparator comparator =
+                new PullUpJoinFromUnionAll().new LogicalPlanComparator();
+        Assertions.assertTrue(comparator.isLogicalEqual(left, right));
+    }
+
+    @Test
+    void comparatorAcceptsSameTestScan() {
+        LogicalTestScan left = newTestScan(19L, "test_common");
+        LogicalTestScan right = newTestScan(19L, "test_common");
+
+        PullUpJoinFromUnionAll.LogicalPlanComparator comparator =
+                new PullUpJoinFromUnionAll().new LogicalPlanComparator();
+        Assertions.assertTrue(comparator.isLogicalEqual(left, right));
+    }
+
+    @Test
+    void comparatorAcceptsSameScanWithDifferentRelationIds() {
+        LogicalOlapScan left = newScan(13, "common_relation_id");
+        LogicalOlapScan right = 
left.withRelationId(PlanConstructor.getNextRelationId());
+
+        PullUpJoinFromUnionAll.LogicalPlanComparator comparator =
+                new PullUpJoinFromUnionAll().new LogicalPlanComparator();
+        Assertions.assertTrue(comparator.isLogicalEqual(left, right));
+    }
+
+    @Test
+    void comparatorAcceptsSameScanWithDifferentTableAliases() {
+        LogicalOlapScan left = newScan(14, 
"common_alias").withTableAlias("left_alias");
+        LogicalOlapScan right = newScan(14, 
"common_alias").withTableAlias("right_alias");
+
+        PullUpJoinFromUnionAll.LogicalPlanComparator comparator =
+                new PullUpJoinFromUnionAll().new LogicalPlanComparator();
+        Assertions.assertTrue(comparator.isLogicalEqual(left, right));
+    }
+
+    @Test
+    void ruleSkipsJoinChildrenWithDifferentFilteredCommonSideOutputs() {
+        LogicalOlapScan commonSmallScan = newScan(10, "common_small");
+        LogicalOlapScan commonLargeScan = newScan(10, "common_large");
+        LogicalFilter<LogicalOlapScan> commonSmall = 
filter(commonSmallScan.withCachedOutput(
+                selectSlotsAsSlots(commonSmallScan.getOutput(), 0)));
+        LogicalFilter<LogicalOlapScan> commonLarge = 
filter(commonLargeScan.withCachedOutput(
+                selectSlotsAsSlots(commonLargeScan.getOutput(), 0, 1)));
+        LogicalOlapScan otherLeft = newScan(20, "other_left");
+        LogicalOlapScan otherRight = newScan(30, "other_right");
+
+        LogicalProject<Plan> unionChild1 = outputProject(
+                join(commonSmall, otherLeft),
+                "x", commonSmall.getOutput().get(0),
+                "y", otherLeft.getOutput().get(1));
+        LogicalProject<Plan> unionChild2 = outputProject(
+                join(commonLarge, otherRight),
+                "x", commonLarge.getOutput().get(0),
+                "y", otherRight.getOutput().get(1));
+
+        LogicalUnion union = union(unionChild1, unionChild2);
+
+        Plan rewritten = 
PlanChecker.from(MemoTestUtils.createConnectContext(), union)
+                .applyTopDown(new PullUpJoinFromUnionAll())
+                .getPlan();
+
+        Assertions.assertInstanceOf(LogicalUnion.class, rewritten);
+        LogicalUnion rewrittenUnion = (LogicalUnion) rewritten;
+        Assertions.assertEquals(2, rewrittenUnion.children().size());
+        Assertions.assertInstanceOf(LogicalProject.class, 
rewrittenUnion.child(0));
+        Assertions.assertInstanceOf(LogicalProject.class, 
rewrittenUnion.child(1));
+    }
+
+    @Test
+    void ruleSkipsJoinChildrenWithDifferentCommonSideTabletScopes() {
+        LogicalOlapScan commonLeft = newScan(40, 
"common_tablet").withSelectedTabletIds(ImmutableList.of(1L));
+        LogicalOlapScan commonRight = newScan(40, 
"common_tablet").withSelectedTabletIds(ImmutableList.of(2L));
+        LogicalOlapScan otherLeft = newScan(41, "other_left_tablet");
+        LogicalOlapScan otherRight = newScan(42, "other_right_tablet");
+
+        LogicalProject<Plan> unionChild1 = outputProject(
+                join(commonLeft, otherLeft),
+                "x", commonLeft.getOutput().get(0),
+                "y", otherLeft.getOutput().get(1));
+        LogicalProject<Plan> unionChild2 = outputProject(
+                join(commonRight, otherRight),
+                "x", commonRight.getOutput().get(0),
+                "y", otherRight.getOutput().get(1));
+
+        LogicalUnion union = union(unionChild1, unionChild2);
+
+        Plan rewritten = 
PlanChecker.from(MemoTestUtils.createConnectContext(), union)
+                .applyTopDown(new PullUpJoinFromUnionAll())
+                .getPlan();
+
+        Assertions.assertInstanceOf(LogicalUnion.class, rewritten);
+    }
+
+    private static LogicalOlapScan newScan(long tableId, String tableName) {
+        return PlanConstructor.newLogicalOlapScan(tableId, tableName, 0);
+    }
+
+    private static LogicalOlapScan newScanWithTableSample(long tableId, String 
tableName,
+            org.apache.doris.nereids.trees.TableSample tableSample) {
+        return new LogicalOlapScan(PlanConstructor.getNextRelationId(),
+                PlanConstructor.newOlapTable(tableId, tableName, 0), 
ImmutableList.of("db"),
+                ImmutableList.of(), ImmutableList.of(), 
Optional.of(tableSample), ImmutableList.of());
+    }
+
+    private static LogicalOlapScan newScanWithScanParams(long tableId, String 
tableName, TableScanParams scanParams) {
+        return new LogicalOlapScan(PlanConstructor.getNextRelationId(),
+                PlanConstructor.newOlapTable(tableId, tableName, 0), 
ImmutableList.of("db"),
+                ImmutableList.of(), ImmutableList.of(), Optional.empty(), 
ImmutableList.of(),
+                Optional.of(scanParams));
+    }
+
+    private static LogicalOlapTableStreamScan newStreamScan(long tableId, 
String tableName) {
+        OlapTableStreamWrapper table = 
Mockito.mock(OlapTableStreamWrapper.class);
+        Mockito.when(table.getId()).thenReturn(tableId);
+        Mockito.when(table.getDatabase()).thenReturn(null);
+        Mockito.when(table.getName()).thenReturn(tableName);
+        
Mockito.when(table.getBaseSchema(false)).thenReturn(ImmutableList.of(new 
Column("id", Type.INT, true)));
+        Mockito.when(table.getBaseSchema()).thenReturn(ImmutableList.of(new 
Column("id", Type.INT, true)));
+        return new 
LogicalOlapTableStreamScan(PlanConstructor.getNextRelationId(),
+                table, ImmutableList.of("db"),
+                ImmutableList.of(), ImmutableList.of(), Optional.empty(), 
ImmutableList.of());
+    }
+
+    private static LogicalOlapTableStreamScan newStreamScanWithOffsets(long 
tableId, String tableName,
+            long streamDbId, long streamId, KeysType keysType, 
ImmutableMap<Long, Pair<Long, Long>> offsets) {
+        OlapTable baseTable = Mockito.mock(OlapTable.class);
+        Mockito.when(baseTable.getId()).thenReturn(tableId);
+        Mockito.when(baseTable.getDatabase()).thenReturn(null);
+        Mockito.when(baseTable.getName()).thenReturn(tableName);
+
+        OlapTableStreamWrapper table = 
Mockito.mock(OlapTableStreamWrapper.class);
+        Mockito.when(table.getId()).thenReturn(tableId);
+        Mockito.when(table.getDatabase()).thenReturn(null);
+        Mockito.when(table.getName()).thenReturn(tableName);
+        Mockito.when(table.getBaseTable()).thenReturn(baseTable);
+        Mockito.when(table.getStreamDbId()).thenReturn(streamDbId);
+        Mockito.when(table.getStreamId()).thenReturn(streamId);
+        Mockito.when(table.getStreamKeysType()).thenReturn(keysType);
+        
Mockito.when(table.getBaseSchema(false)).thenReturn(ImmutableList.of(new 
Column("id", Type.INT, true)));

Review Comment:
   This still does not prove the comparator reaches the `readMode` branch. The 
reset side created by `withReadMode(StreamReadMode.RESET)` recomputes its 
output, and `LogicalOlapTableStreamScan.computeOutput()` calls 
`getBaseSchema(true)` for reset mode. This helper only stubs 
`getBaseSchema(false)` and the no-arg overload, so Mockito returns the default 
for `true` and the test can fail while building output, before 
`hasSameScanState()` compares `readMode`. Please stub the `true` overload as 
well, so the snapshot and reset scans have equal output shape and the assertion 
fails specifically on `readMode`.



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