[refactor](planner)Cancel the return value default 65535 limit

docs/en/docs/advanced/variables.md

@@ -176,6 +176,10 @@ Note that the comment must start with /*+ and can only follow the SELECT.
 
     Used for compatibility with MySQL clients. No practical effect.
 
+* `default_order_by_limit`
+
+  Used to control the default number of items returned after OrderBy. The default value is -1, and the maximum number of records after the query is returned by default, and the upper limit is the MAX_VALUE of the long data type.
+
 * `delete_without_partition`
 
     When set to true. When using the delete command to delete partition table data, no partition is required. The delete operation will be automatically applied to all partitions.
@@ -548,4 +552,4 @@ Translated with www.DeepL.com/Translator (free version)
 
 * `validate_password_policy`
 
-	Password strength verification policy. Defaults to `NONE` or `0`, i.e. no verification. Can be set to `STRONG` or `2`. When set to `STRONG` or `2`, when setting a password via the `ALTER USER` or `SET PASSWORD` commands, the password must contain any of "uppercase letters", "lowercase letters", "numbers" and "special characters". 3 items, and the length must be greater than or equal to 8. Special characters include: `~!@#$%^&*()_+|<>,.?/:;'[]{}"`.
+	Password strength verification policy. Defaults to `NONE` or `0`, i.e. no verification. Can be set to `STRONG` or `2`. When set to `STRONG` or `2`, when setting a password via the `ALTER USER` or `SET PASSWORD` commands, the password must contain any of "uppercase letters", "lowercase letters", "numbers" and "special characters". 3 items, and the length must be greater than or equal to 8. Special characters include: `~!@#$%^&*()_+|<>,.?/:;'[]{}"`.

docs/zh-CN/docs/advanced/variables.md

@@ -174,6 +174,10 @@ SELECT /*+ SET_VAR(query_timeout = 1, enable_partition_cache=true) */ sleep(3);
 
   用于兼容 MySQL 客户端。无实际作用。
 
+- `default_order_by_limit`
+
+  用于控制 OrderBy 以后返回的默认条数。默认值为 -1，默认返回查询后的最大条数，上限为 long 数据类型的 MAX_VALUE 值。
+
 - `delete_without_partition`
 
   设置为 true 时。当使用 delete 命令删除分区表数据时，可以不指定分区。delete 操作将会自动应用到所有分区。

fe/fe-core/src/main/java/org/apache/doris/planner/SingleNodePlanner.java

@@ -236,8 +236,13 @@ private void unmarkCollectionSlots(QueryStmt stmt) {
     private PlanNode createQueryPlan(QueryStmt stmt, Analyzer analyzer, long defaultOrderByLimit)
             throws UserException {
         long newDefaultOrderByLimit = defaultOrderByLimit;
+        long defaultLimit = analyzer.getContext().getSessionVariable().defaultOrderByLimit;
         if (newDefaultOrderByLimit == -1) {
-            newDefaultOrderByLimit = 65535;
+            if (defaultLimit <= -1) {
+                newDefaultOrderByLimit = Long.MAX_VALUE;
+            } else {
+                newDefaultOrderByLimit = defaultLimit;
+            }
         }
         PlanNode root;
         if (stmt instanceof SelectStmt) {

fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java

@@ -203,6 +203,8 @@ public class SessionVariable implements Serializable, Writable {
 
     static final String SESSION_CONTEXT = "session_context";
 
+    public static final String DEFAULT_ORDER_BY_LIMIT = "default_order_by_limit";
+
     public static final String ENABLE_SINGLE_REPLICA_INSERT = "enable_single_replica_insert";
 
     public static final String ENABLE_FUNCTION_PUSHDOWN = "enable_function_pushdown";
@@ -244,6 +246,11 @@ public class SessionVariable implements Serializable, Writable {
     @VariableMgr.VarAttr(name = ENABLE_EXCHANGE_NODE_PARALLEL_MERGE)
     public boolean enableExchangeNodeParallelMerge = false;
 
+    // By default, the number of Limit items after OrderBy is changed from 65535 items
+    // before v1.2.0 (not included), to return all items by default
+    @VariableMgr.VarAttr(name = DEFAULT_ORDER_BY_LIMIT)
+    public long defaultOrderByLimit = -1;
+
     // query timeout in second.
     @VariableMgr.VarAttr(name = QUERY_TIMEOUT)
     public int queryTimeoutS = 300;