[fix](Nereids) should push project through limit after eliminate unio…

…n node (#39640) (#39755)

pick from master #39640

otherwise:

push limit through union could generate plan:

limit
+-- union
    |-- limit
    |   +-- empty relation
    +-- limit
        +-- project

and then eliminate union will generate plan:

+-- limit
    +-  project
        +-- limit
            +-- project

it could not be processed by tranlator correctly

fe/fe-core/src/main/java/org/apache/doris/nereids/jobs/executor/Rewriter.java

@@ -114,6 +114,7 @@
 import org.apache.doris.nereids.rules.rewrite.PushDownLimit;
 import org.apache.doris.nereids.rules.rewrite.PushDownLimitDistinctThroughJoin;
 import org.apache.doris.nereids.rules.rewrite.PushDownLimitDistinctThroughUnion;
+import org.apache.doris.nereids.rules.rewrite.PushDownProjectThroughLimit;
 import org.apache.doris.nereids.rules.rewrite.PushDownTopNDistinctThroughJoin;
 import org.apache.doris.nereids.rules.rewrite.PushDownTopNDistinctThroughUnion;
 import org.apache.doris.nereids.rules.rewrite.PushDownTopNThroughJoin;
@@ -416,7 +417,17 @@ public class Rewriter extends AbstractBatchJobExecutor {
                 topic("eliminate",
                         // SORT_PRUNING should be applied after mergeLimit
                         custom(RuleType.ELIMINATE_SORT, EliminateSort::new),
-                        bottomUp(new EliminateEmptyRelation())
+                        bottomUp(
+                                new EliminateEmptyRelation(),
+                                // after eliminate empty relation under union, we could get
+                                // limit
+                                // +-- project
+                                //     +-- limit
+                                //         + project
+                                // so, we need push project through limit to satisfy translator's assumptions
+                                new PushDownFilterThroughProject(),
+                                new PushDownProjectThroughLimit(),
+                                new MergeProjects())
                 ),
                 topic("agg rewrite",
                     // these rules should be put after mv optimization to avoid mv matching fail

regression-test/suites/nereids_p0/union/push_limit_with_eliminate_union.groovy

@@ -0,0 +1,21 @@
+// 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("push_limit_with_eliminate_union") {
+    // this should not failed for [INTERNAL_ERROR]VSlotRef  have invalid slot id
+    sql """(select 1 limit 0 union all select count() + 1) limit 1;"""
+}