[fix](nereids) Use precison and scale of decimal type column (#15025)

fe/fe-core/src/main/java/org/apache/doris/nereids/types/DecimalV2Type.java

@@ -17,6 +17,7 @@
 
 package org.apache.doris.nereids.types;
 
+import org.apache.doris.catalog.ScalarType;
 import org.apache.doris.catalog.Type;
 import org.apache.doris.nereids.types.coercion.AbstractDataType;
 import org.apache.doris.nereids.types.coercion.FractionalType;
@@ -105,7 +106,7 @@ public class DecimalV2Type extends FractionalType {
 
     @Override
     public Type toCatalogDataType() {
-        return Type.MAX_DECIMALV2_TYPE;
+        return ScalarType.createDecimalType(precision, scale);
     }
 
     public int getPrecision() {

regression-test/suites/nereids_syntax_p0/test_dup_tab_decimal_nullable.groovy

@@ -0,0 +1,134 @@
+// 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("test_nereids_dup_tab_decimal_nullable") {
+
+    sql "SET enable_vectorized_engine=true"
+    sql "SET enable_nereids_planner=true"
+    sql "SET enable_fallback_to_original_planner=false"
+
+    def table1 = "test_dup_tab_decimal_nullable"
+
+    sql "drop table if exists ${table1}"
+
+    sql """
+        CREATE TABLE IF NOT EXISTS `${table1}` (
+          `siteid` decimal(10, 5) NULL COMMENT "",
+          `citycode` decimal(10, 5) NULL COMMENT "",
+          `userid` decimal(10, 5) NULL COMMENT "",
+          `pv` decimal(10, 5) NULL COMMENT ""
+        ) ENGINE=OLAP
+        DUPLICATE KEY(`siteid`)
+        COMMENT "OLAP"
+        DISTRIBUTED BY HASH(`siteid`) BUCKETS 1
+        PROPERTIES (
+        "replication_allocation" = "tag.location.default: 1",
+        "in_memory" = "false",
+        "storage_format" = "V2"
+        )
+    """
+
+    sql "set enable_vectorized_engine = false"
+
+    sql """insert into ${table1} values(1.1,1.2,1.3,1.4),
+        (1.1,2.2,2.3,3.4),
+        (2.1,2.2,2.3,2.4),
+        (3.1,3.2,3.3,3.4),
+        (4.1,4.2,4.3,4.4),
+        (null,2,null,4)
+    """
+
+    sql "set enable_vectorized_engine = true"
+
+    // query decimal
+    test {
+        sql "select siteid from ${table1} order by siteid"
+        result([[null],[1.10000],[1.10000],[2.10000],[3.10000],[4.10000]])
+    }
+    // FIXME(wb) this may failed because of regression framework
+//    test {
+//        sql "select siteid,citycode from ${table1} order by siteid,citycode"
+//        result([[null,2],[1.1,1.2],[1.1,2.2],[2.1,2.2],[3.1,3.2],[4.1,4.2]])
+//    }
+
+    // pred is decimal
+    test {
+        sql "select siteid from ${table1} where siteid=4.1"
+        result([[4.10000]])
+    }
+    test {
+        sql "select siteid from ${table1} where siteid=1.1"
+        result([[1.10000],[1.10000]])
+    }
+
+    // pred not key
+    test {
+        sql "select citycode from ${table1} where citycode=2.2"
+        result([[2.20000],[2.20000]])
+    }
+    test {
+        sql "select citycode from ${table1} where citycode=4.2"
+        result([[4.20000]])
+    }
+
+    // pred column not same with read column
+    test {
+        sql "select citycode from ${table1} where siteid=4.1"
+        result([[4.20000]])
+    }
+
+    test {
+        sql "select citycode from ${table1} where siteid=1.1 order by citycode"
+        result([[1.20000],[2.20000]])
+    }
+
+    // pred column not same with read column;pred is not key
+    test {
+        sql "select siteid from ${table1} where citycode=2.2 order by siteid"
+        result([[1.10000],[2.10000]])
+    }
+
+    test {
+        sql "select siteid from ${table1} where citycode=4.2 order by siteid"
+        result([[4.10000]])
+    }
+
+    // int pred
+    test {
+        sql "select userid from ${table1} where userid in(2.3)"
+        result([[2.30000],[2.30000]])
+    }
+
+    test {
+        sql "select userid from ${table1} where userid not in(2.3) order by userid"
+        result([[1.30000],[3.30000],[4.30000]])
+    }
+
+    // is null
+    test {
+        sql "select userid from  ${table1} where userid is null"
+        result([[null]])
+    }
+    // is not null
+    test {
+        sql "select userid from  ${table1} where userid is not null order by userid"
+        result([[1.30000],[2.30000],[2.30000],[3.30000],[4.30000]])
+    }
+
+    sql "drop table if exists ${table1}"
+
+}