Fixed bug CORE-2165 : Unnecessary 1 index read may occur when using s…

…trict inequality condition
FirebirdSQL · Dec 25, 2013 · 2e7ca28 · 2e7ca28
1 parent 7ef7eb3
commit 2e7ca28
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/src/jrd/btr.cpp b/src/jrd/btr.cpp
@@ -555,8 +555,12 @@ static void checkForLowerKeySkip(bool& skipLowerKey,
 	else
 	{
 		// Check if we have a duplicate node (for the same page)
-		if (node.prefix < lower.key_length) {
-			skipLowerKey = false;
+		if (node.prefix < lower.key_length) 
+		{
+			if (node.prefix + node.length == lower.key_length)
+				skipLowerKey = (memcmp(node.data, lower.key_data + node.prefix, node.length) == 0);
+			else
+				skipLowerKey = false;
 		}
 		else if ((node.prefix == lower.key_length) && node.length)
 		{