grant visitor optimize (#4214)

shardingsphere-sql-parser/shardingsphere-sql-parser-mysql/src/main/antlr4/imports/mysql/DCLStatement.g4

@@ -20,18 +20,18 @@ grammar DCLStatement;
 import Symbol, Keyword, MySQLKeyword, Literals, BaseRule;
 
 grant
-    : GRANT (proxyClause_ | privilegeClause_ | roleClause_)
+    : GRANT (proxyClause_ | privilegeClause | roleClause_)
     ;
 
 revoke
-    : REVOKE (proxyClause_ | privilegeClause_ | allClause_ | roleClause_)
+    : REVOKE (proxyClause_ | privilegeClause | allClause_ | roleClause_)
     ;
 
 proxyClause_
     : PROXY ON userOrRole TO userOrRoles_ withGrantOption_?
     ;
 
-privilegeClause_
+privilegeClause
     : privileges_ ON onObjectClause_ (TO | FROM) userOrRoles_ withGrantOption_? grantOption_?
     ;
 
@@ -94,14 +94,14 @@ privilegeType_
     ;
 
 onObjectClause_
-    : objectType_? privilegeLevel_
+    : objectType_? privilegeLevel
     ;
 
 objectType_
     : TABLE | FUNCTION | PROCEDURE
     ;
 
-privilegeLevel_
+privilegeLevel
     : ASTERISK_ | ASTERISK_ DOT_ASTERISK_ | identifier DOT_ASTERISK_ | tableName
     ;
 

shardingsphere-sql-parser/shardingsphere-sql-parser-mysql/src/main/java/org/apache/shardingsphere/sql/parser/visitor/MySQLDCLVisitor.java

@@ -24,8 +24,8 @@ import org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.CreateU
 import org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.DropRoleContext;
 import org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.DropUserContext;
 import org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.GrantContext;
-import org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.PrivilegeClause_Context;
-import org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.PrivilegeLevel_Context;
+import org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.PrivilegeClauseContext;
+import org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.PrivilegeLevelContext;
 import org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.RenameUserContext;
 import org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.SetDefaultRoleContext;
 import org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.SetPasswordContext;
@@ -93,9 +93,9 @@ public final class MySQLDCLVisitor extends MySQLVisitor {
     @Override
     public ASTNode visitGrant(final GrantContext ctx) {
         GrantStatement result = new GrantStatement();
-        PrivilegeClause_Context privilegeClause = ctx.privilegeClause_();
+        PrivilegeClauseContext privilegeClause = ctx.privilegeClause();
         if (null != privilegeClause && null != privilegeClause.onObjectClause_()) {
-            PrivilegeLevel_Context privilegeLevel = privilegeClause.onObjectClause_().privilegeLevel_();
+            PrivilegeLevelContext privilegeLevel = privilegeClause.onObjectClause_().privilegeLevel();
             TableNameContext tableNameContext = privilegeLevel.tableName();
             if (null != tableNameContext) {
                 TableSegment tableSegment = (TableSegment) visitTableName(tableNameContext);