From 5226a0149d1d49aef506535c8d27b00981dcd115 Mon Sep 17 00:00:00 2001
From: Christian Schneider
Date: Wed, 29 Apr 2020 16:37:27 +0200
Subject: Check fields used with NI for NULL first to take advantage of indices

---
 it_dbi.class | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/it_dbi.class b/it_dbi.class
index 3620018..39f50a7 100644
--- a/it_dbi.class
+++ b/it_dbi.class
@@ -401,7 +401,7 @@ function _where($params)
 							foreach ((array)$value as $val)
 								$parts[] = "CONCAT(',',$field,',') LIKE " . $this->escape_string("%,$val,%");
 
-							$query .= $sep . "(" . join(" OR ", $parts) . ")";
+							$query .= $sep . "$field IS NOT NULL AND (" . join(" OR ", $parts) . ")";	# Check for IS NOT NULL to take advantage of index
 						}
 						else
 							$query .= $sep . "1";
-- 
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