improved sql parser.

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

@@ -28,8 +28,7 @@ import com.alibaba.druid.util.JdbcConstants;
 public class PGDeleteStatement extends SQLDeleteStatement implements PGSQLStatement {
 
     private boolean       returning;
-    private String        alias;
-    
+
     public PGDeleteStatement() {
         super (JdbcConstants.POSTGRESQL);
     }
@@ -43,15 +42,16 @@ public class PGDeleteStatement extends SQLDeleteStatement implements PGSQLStatem
     }
 
     public String getAlias() {
-        return alias;
+        if (tableSource == null) {
+            return null;
+        }
+        return tableSource.getAlias();
     }
 
     public void setAlias(String alias) {
-        this.alias = alias;
+        this.tableSource.setAlias(alias);
     }
 
-
-
     protected void accept0(SQLASTVisitor visitor) {
         accept0((PGASTVisitor) visitor);
     }
@@ -73,7 +73,6 @@ public class PGDeleteStatement extends SQLDeleteStatement implements PGSQLStatem
         cloneTo(x);
 
         x.returning = returning;
-        x.alias = alias;
 
         return x;
     }

src/main/java/com/alibaba/druid/sql/visitor/SQLASTOutputVisitor.java

@@ -163,6 +163,14 @@ public class SQLASTOutputVisitor extends SQLASTVisitorAdapter implements Paramet
         this.inputParameters = parameters;
     }
 
+    /**
+     *
+     * @since 1.1.5
+     */
+    public void setOutputParameters(List<Object> parameters) {
+        this.parameters = parameters;
+    }
+
     public int getIndentCount() {
         return indentCount;
     }
@@ -2286,10 +2294,16 @@ public class SQLASTOutputVisitor extends SQLASTVisitorAdapter implements Paramet
 
     public boolean visit(SQLDeleteStatement x) {
         SQLTableSource from = x.getFrom();
+        String alias = x.getAlias();
 
         if (from == null) {
             print0(ucase ? "DELETE FROM " : "delete from ");
             printTableSourceExpr(x.getTableName());
+
+            if (alias != null) {
+                print(' ');
+                print0(alias);
+            }
         } else {
             print0(ucase ? "DELETE " : "delete ");
             printTableSourceExpr(x.getTableName());