[fix](planner) Keep type of null literal expr when register conjuncts (#15878)

For now, type information of child expr which is NullLiteral would get lost in the CastExpr#getResultValue, this will produce a NullLiteral with Null  type which cause BE core when doing cast

fe/fe-core/src/main/java/org/apache/doris/analysis/CastExpr.java

@@ -417,7 +417,7 @@ public class CastExpr extends Expr {
 
     private Expr castTo(LiteralExpr value) throws AnalysisException {
         if (value instanceof NullLiteral) {
-            return value;
+            return NullLiteral.create(targetTypeDef.getType());
         } else if (type.isIntegerType()) {
             return new IntLiteral(value.getLongValue(), type);
         } else if (type.isLargeIntType()) {

fe/fe-core/src/main/java/org/apache/doris/analysis/FunctionParams.java

@@ -75,7 +75,7 @@ public class FunctionParams implements Writable {
     }
 
     public TAggregateExpr createTAggregateExpr(boolean isMergeAggFn) {
-        List<TTypeDesc> paramTypes = new ArrayList<TTypeDesc>();
+        List<TTypeDesc> paramTypes = new ArrayList<>();
         if (exprs != null) {
             for (Expr expr : exprs) {
                 TTypeDesc desc = expr.getType().toThrift();

regression-test/data/bitmap_functions/test_bitmap_max.out

@@ -0,0 +1,6 @@
+-- This file is automatically generated. You should know what you did if you want to edit this
+-- !select --
+1
+2
+3
+

regression-test/suites/bitmap_functions/test_bitmap_max.groovy

@@ -0,0 +1,48 @@
+// 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_bitmap_max") {
+    sql """DROP TABLE IF EXISTS  t1;"""
+
+    sql """
+            CREATE TABLE `t1`
+            (
+                `col1` INT,
+                `col2` bitmap BITMAP_UNION NOT NULL COMMENT ""
+            ) ENGINE = OLAP AGGREGATE KEY(`col1`)
+                DISTRIBUTED BY HASH(`col1`) BUCKETS 4
+                PROPERTIES (
+                        "replication_allocation" = "tag.location.default: 1"
+            );
+    """
+
+    sql """
+            INSERT INTO t1 VALUES(1, to_bitmap(1)),
+                (2, to_bitmap(2)),
+                (3, to_bitmap(3));
+    """
+
+    order_qt_select """
+            SELECT /*+ SET_VAR(query_timeout = 600) */
+                Coalesce(Bitmap_max(Cast(
+                Bitmap_empty() AS BITMAP)), a.`col1`)
+                AS c4
+            FROM   t1 AS a
+            WHERE  Bitmap_max(Cast(NULL AS BITMAP)) IS NULL;
+    """
+
+}