From 5cc59979a6d302db08accdc31232d6f7d9ca3d25 Mon Sep 17 00:00:00 2001
From: morrySnow <101034200+morrySnow@users.noreply.github.com>
Date: Tue, 13 Aug 2024 19:29:13 +0800
Subject: [PATCH] [opt](set operation) INTERSECT should evaluated before others
 (#39095)

pick from master #39095

this is a behaviour change PR.

set operation INTERSECT should evaluated before others. In Doris
history, all set operators have same priority.

This PR change Nereids, let it be same with MySQL.
---
 .../src/main/antlr4/org/apache/doris/nereids/DorisParser.g4    | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fe/fe-core/src/main/antlr4/org/apache/doris/nereids/DorisParser.g4 b/fe/fe-core/src/main/antlr4/org/apache/doris/nereids/DorisParser.g4
index 7b56e1479c4089..5ea1ce2c2e587b 100644
--- a/fe/fe-core/src/main/antlr4/org/apache/doris/nereids/DorisParser.g4
+++ b/fe/fe-core/src/main/antlr4/org/apache/doris/nereids/DorisParser.g4
@@ -347,7 +347,8 @@ query
 
 queryTerm
     : queryPrimary                                                         #queryTermDefault
-    | left=queryTerm operator=(UNION | EXCEPT | MINUS | INTERSECT)
+    | left=queryTerm operator=INTERSECT setQuantifier? right=queryTerm     #setOperation
+    | left=queryTerm operator=(UNION | EXCEPT | MINUS)
       setQuantifier? right=queryTerm                                       #setOperation
     ;