From 5d1af7d884ae26660695de7363f6bbce053b66d8 Mon Sep 17 00:00:00 2001
From: xvrl <xavier@metamarkets.com>
Date: Sat, 2 Mar 2013 14:09:20 -0800
Subject: [PATCH] support aliasing

---
 .../main/antlr4/com/metamx/druid/sql/antlr4/DruidSQL.g4   | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/client/src/main/antlr4/com/metamx/druid/sql/antlr4/DruidSQL.g4 b/client/src/main/antlr4/com/metamx/druid/sql/antlr4/DruidSQL.g4
index 458c4c7b2c0..47096aebffb 100644
--- a/client/src/main/antlr4/com/metamx/druid/sql/antlr4/DruidSQL.g4
+++ b/client/src/main/antlr4/com/metamx/druid/sql/antlr4/DruidSQL.g4
@@ -148,7 +148,13 @@ datasource
     ;
 
 aliasedExpression returns [PostAggregator p]
-    : expression ( AS^ name=IDENT )? { $p = $expression.p; }
+    : expression ( AS^ name=IDENT )? {
+        if($name != null) {
+            postAggregators.add($expression.p);
+            $p = new FieldAccessPostAggregator($name.text, $expression.p.getName());
+        }
+        else $p = $expression.p;
+    }
     ;
 
 expression returns [PostAggregator p]