the groupConcatMaxLen parameter is omitted inner 1738 (#3318)

fix
# Conflicts:
#	src/main/java/com/actiontech/dble/singleton/SystemParams.java

src/main/java/com/actiontech/dble/config/model/SystemConfig.java

@@ -1758,6 +1758,7 @@ public final class SystemConfig {
                 ", routePenetrationRules='" + routePenetrationRules + '\'' +
                 ", district='" + district +
                 ", dataCenter='" + dataCenter +
+                ", groupConcatMaxLen='" + groupConcatMaxLen +
                 "]";
     }
 

src/main/java/com/actiontech/dble/singleton/SystemParams.java

@@ -152,6 +152,7 @@ public final class SystemParams {
         readOnlyParams.add(new ParamInfo("gmsslBothPfx", SystemConfig.getInstance().getGmsslBothPfx() + "", "National secret dual certificate/private key file in PFX format"));
         readOnlyParams.add(new ParamInfo("gmsslRcaPem", SystemConfig.getInstance().getGmsslRcaPem() + "", "Root certificate of GMSSL"));
         readOnlyParams.add(new ParamInfo("gmsslOcaPem", SystemConfig.getInstance().getGmsslOcaPem() + "", "Secondary certificate of GMSSL"));
+        readOnlyParams.add(new ParamInfo("groupConcatMaxLen", sysConfig.getGroupConcatMaxLen() + "", "The maximum permitted result length in bytes for the GROUP_CONCAT() function. The default is 1024."));
 
     }
 

src/main/resources/bootstrap_template.cnf

@@ -203,6 +203,7 @@
 #For rwSplitUser, Implement stickiness for read and write instances, the default value is 1000ms
 #-DrwStickyTime=1000
 #-DjoinStrategyType=-1
+#-DgroupConcatMaxLen = 1024
 
 #-DserverCertificateKeyStoreUrl=
 #-DserverCertificateKeyStorePwd=