github-actions[bot] commented on code in PR #67154:
URL: https://github.com/apache/doris/pull/67154#discussion_r3870593911


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regression-test/suites/nereids_function_p0/agg_function/nereids_agg_fn_map_decimal_precision.groovy:
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@@ -0,0 +1,59 @@
+// 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.
+
+// map_agg/map_agg_v2 expose their MAP key/value as independent top-level 
Any(0)/Any(1)
+// arguments. The default decimal v3 precision promotion must keep those 
logical groups
+// independent: merging them into one wider type would widen the DECIMAL(38,0) 
key to a
+// scale that cannot hold a 38-digit integral key (so the entry disappears as 
a NULL key)
+// and truncate twelve fractional digits from the DECIMAL(38,18) value before 
aggregation.
+suite("nereids_agg_fn_map_decimal_precision") {
+    sql "set enable_nereids_planner=true"
+    sql "set enable_fallback_to_original_planner=false"
+
+    sql "drop table if exists map_agg_dec_precision"
+    sql """
+        create table map_agg_dec_precision (
+            g int,
+            k decimal(38, 0),
+            v decimal(38, 18)
+        )
+        duplicate key(g)
+        distributed by hash(g) buckets 1
+        properties("replication_num" = "1")
+    """
+    sql """
+        insert into map_agg_dec_precision values
+            (1, 99999999999999999999999999999999999999, 0.125000000000000000),
+            (2, 12345678901234567890123456789012345678, 2.000000000000000001),
+            (2, 12345678901234567890123456789012345678, 3.000000000000000000)
+    """
+
+    // the 38-digit integral key must be preserved, and the value must keep 
all 18
+    // fractional digits
+    order_qt_map_agg_decimal_precision """
+        select map_agg(k, v) from map_agg_dec_precision where g = 1;

Review Comment:
   [P2] Exercise MapAggV1 instead of aliasing V2 twice
   
   `BuiltinAggregateFunctions` registers `map_agg` as an alias of `MapAggV2`; 
the V1 class is reachable only as `map_agg_v1`. Consequently this query and the 
following `map_agg_v2` query exercise the same implementation, while the 
generic precision change also affects the distinct V1 typed-column path. Please 
make this query call `map_agg_v1(k, v)` so both aggregate implementations are 
covered.



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