From 75f8b11fb2a4ad2d0d9ecbb2b3bfd98039eb838b Mon Sep 17 00:00:00 2001
From: Leon Zhang <martianzhang@hotmail.com>
Date: Mon, 22 Apr 2019 18:58:25 +0800
Subject: [PATCH] add list range check

---
 advisor/heuristic.go | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/advisor/heuristic.go b/advisor/heuristic.go
index 243fa05..d8377aa 100644
--- a/advisor/heuristic.go
+++ b/advisor/heuristic.go
@@ -2149,14 +2149,16 @@ func (q *Query4Audit) RuleSpaceWithQuote() Rule {
 	var rule = q.RuleOK()
 	for _, tk := range ast.Tokenize(q.Query) {
 		if tk.Type == ast.TokenTypeQuote {
-			// 序列化的Val是带引号，所以要取第2个最倒数第二个，这样也就不用担心len<2了。
-			switch tk.Val[1] {
-			case ' ':
-				rule = HeuristicRules["ARG.009"]
-			}
-			switch tk.Val[len(tk.Val)-2] {
-			case ' ':
-				rule = HeuristicRules["ARG.009"]
+			if len(tk.Val) >= 2 {
+				// 序列化的Val是带引号，所以要取第2个和倒数第二个，这样也就不用担心len<2了。
+				switch tk.Val[1] {
+				case ' ':
+					rule = HeuristicRules["ARG.009"]
+				}
+				switch tk.Val[len(tk.Val)-2] {
+				case ' ':
+					rule = HeuristicRules["ARG.009"]
+				}
 			}
 		}
 	}
-- 
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