Support SET for PostgreSQL (#4293)

shardingsphere-sql-parser/shardingsphere-sql-parser-engine/src/main/java/org/apache/shardingsphere/sql/parser/core/extractor/util/RuleName.java

@@ -241,6 +241,8 @@ public enum RuleName {
     
     SET_VARIABLE("SetVariable"),
     
+    SET("Set"),
+    
     CALL("Call");
     
     private final String name;

shardingsphere-sql-parser/shardingsphere-sql-parser-engine/src/main/java/org/apache/shardingsphere/sql/parser/core/visitor/ParseTreeVisitorFactory.java

@@ -55,7 +55,7 @@ public final class ParseTreeVisitorFactory {
                 RuleName.DROP_ROLE.getName(), RuleName.SET_DEFAULT_ROLE.getName(), RuleName.SET_ROLE.getName(), RuleName.SET_PASSWORD.getName()));
         SQL_VISITOR_RULES.put("DALVisitor", Lists.newArrayList(RuleName.USE.getName(), RuleName.DESC.getName(), RuleName.SHOW_DATABASES.getName(),
                 RuleName.SHOW_TABLES.getName(), RuleName.SHOW_TABLE_STATUS.getName(), RuleName.SHOW_COLUMNS.getName(), RuleName.SHOW_INDEX.getName(),
-                RuleName.SHOW_CREATE_TABLE.getName(), RuleName.SHOW_OTHER.getName(), RuleName.SET_VARIABLE.getName(), RuleName.CALL.getName()));
+                RuleName.SHOW_CREATE_TABLE.getName(), RuleName.SHOW_OTHER.getName(), RuleName.SET_VARIABLE.getName(), RuleName.SET.getName(), RuleName.CALL.getName()));
     }
     
     /** 

shardingsphere-sql-parser/shardingsphere-sql-parser-postgresql/src/main/java/org/apache/shardingsphere/sql/parser/visitor/impl/PostgreSQLDALVisitor.java

@@ -17,6 +17,9 @@
 
 package org.apache.shardingsphere.sql.parser.visitor.impl;
 
+import org.apache.shardingsphere.sql.parser.autogen.PostgreSQLStatementParser.SetContext;
+import org.apache.shardingsphere.sql.parser.sql.ASTNode;
+import org.apache.shardingsphere.sql.parser.sql.statement.dal.dialect.mysql.SetStatement;
 import org.apache.shardingsphere.sql.parser.visitor.PostgreSQLVisitor;
 
 /**
@@ -25,4 +28,9 @@ import org.apache.shardingsphere.sql.parser.visitor.PostgreSQLVisitor;
  * @author zhangliang
  */
 public final class PostgreSQLDALVisitor extends PostgreSQLVisitor {
+    
+    @Override
+    public ASTNode visitSet(final SetContext ctx) {
+        return new SetStatement();
+    }
 }