bug fixed sql parser aggregate distinct output

src/main/java/com/alibaba/druid/sql/dialect/postgresql/ast/PGAggregateExpr.java

@@ -20,7 +20,7 @@ public class PGAggregateExpr extends SQLAggregateExpr implements PGSQLObject {
 
 	private static final long serialVersionUID = 1L;
 
-	public PGAggregateExpr(String methodName, int option) {
+	public PGAggregateExpr(String methodName, Option option) {
 		super(methodName, option);
 	}
 

src/main/java/com/alibaba/druid/sql/dialect/postgresql/parser/PGExprParser.java

@@ -19,16 +19,18 @@ public class PGExprParser extends SQLExprParser{
         super(lexer);
     }
     
-    protected SQLAggregateExpr parseAggregateExpr(String method_name) throws ParserException {
+    protected SQLAggregateExpr parseAggregateExpr(String methodName) throws ParserException {
+        methodName = methodName.toUpperCase();
+        
         PGAggregateExpr aggregateExpr;
         if (lexer.token() == Token.ALL) {
-            aggregateExpr = new PGAggregateExpr(method_name, 1);
+            aggregateExpr = new PGAggregateExpr(methodName, SQLAggregateExpr.Option.ALL);
             lexer.nextToken();
         } else if (lexer.token() == Token.DISTINCT) {
-            aggregateExpr = new PGAggregateExpr(method_name, 0);
+            aggregateExpr = new PGAggregateExpr(methodName, SQLAggregateExpr.Option.DISTINCT);
             lexer.nextToken();
         } else {
-            aggregateExpr = new PGAggregateExpr(method_name, 1);
+            aggregateExpr = new PGAggregateExpr(methodName);
         }
 
         exprList(aggregateExpr.getArguments());

src/main/java/com/alibaba/druid/sql/dialect/postgresql/visitor/PGOutputVisitor.java

@@ -433,12 +433,21 @@ public class PGOutputVisitor extends SQLASTOutputVisitor implements PGASTVisitor
     @Override
     public boolean visit(PGAggregateExpr x) {
         print(x.getMethodName());
+        
         print("(");
+        
+        if (x.getOption() != null) {
+            print(x.getOption().toString());
+            print(' ');
+        }
+        
         printAndAccept(x.getArguments(), ", ");
         print(")");
+        
         if (x.getOver() != null) {
             x.getOver().accept(this);
         }
+        
         return false;
     }