used same constant

Author: chernser

client-v2/src/main/java/com/clickhouse/client/api/ClientSettings.java

@@ -35,4 +35,6 @@ public static List<String> valuesFromCommaSeparated(String value) {
     }
 
     public static final String SESSION_DB_ROLES = "session_db_roles";
+
+    public static final String SETTING_LOG_COMMENT = SERVER_SETTING_PREFIX + "log_comment";
 }

client-v2/src/main/java/com/clickhouse/client/api/insert/InsertSettings.java

@@ -233,7 +233,7 @@ public Collection<String> getDBRoles() {
     public InsertSettings logComment(String logComment) {
         this.logComment = logComment;
         if (logComment != null && !logComment.isEmpty()) {
-            rawSettings.put(ClientSettings.SERVER_SETTING_PREFIX + "log_comment", logComment);
+            rawSettings.put(ClientSettings.SETTING_LOG_COMMENT, logComment);
         }
         return this;
     }

client-v2/src/main/java/com/clickhouse/client/api/query/QuerySettings.java

@@ -249,7 +249,7 @@ public Collection<String> getDBRoles() {
     public QuerySettings logComment(String logComment) {
         this.logComment = logComment;
         if (logComment != null && !logComment.isEmpty()) {
-            rawSettings.put(ClientSettings.SERVER_SETTING_PREFIX + "log_comment", logComment);
+            rawSettings.put(ClientSettings.SETTING_LOG_COMMENT, logComment);
         }
         return this;
     }