Update 03-set-var.md

Author: soyeric128

docs/en/sql-reference/10-sql-commands/50-administration-cmds/03-set-var.md

@@ -4,6 +4,10 @@ title: SET_VAR
 
 SET_VAR is used to specify optimizer hints within a single SQL statement, allowing for finer control over the execution plan of that specific statement. This includes:
 
+:::note
+SET_VAR will be deprecated in an upcoming release. Consider using the [SETTINGS Clause](../20-query-syntax/settings.md) instead.
+:::
+
 - Configure settings temporarily, affecting only the duration of the SQL statement execution. It's important to note that the settings specified with SET_VAR will solely impact the result of the current statement being executed and will not have any lasting effects on the overall database configuration. For a list of available settings that can be configured using SET_VAR, see [SHOW SETTINGS](03-show-settings.md). To understand how it works, see these examples:
 
     - [Example 1. Temporarily Set Timezone](#example-1-temporarily-set-timezone)