Switch to a new state after the antlr4 tokens

Question

i has the following grammar

root
    : sql_statements EOF | EOF
   ;

sql_statements
    :( sql_statement )+
   ;

sql_statement
    : ddl_statement semicolon
   ;

ddl_statement
    : alter_statement
   ;

This is the first shot of my grammar I have the following test case

aleter table user;alter table group_user;

the first statement has an error, so I get an error for both statements in accordance with the sql_statements rule

Failed to parse at line 1:1 due to mismatched input 'aleter' expecting ALTER

Now I want to use the Defaulterrorhandler function to skip the first statement to the semicolon. Then it should start with the second statement, starting with the sql_statements rule.

Question :
How to tell which rule to start after consuming error tokens ?
Thanks in advance.