From 96d64d9317ec641604b4a81c89d5146961bf8a5e Mon Sep 17 00:00:00 2001
From: David Goodwin <david@palepurple.co.uk>
Date: Fri, 7 Sep 2018 11:04:19 +0100
Subject: [PATCH] try and fix #30 - cope with timestamp and numeric field
 number comparison better for PostgreSQL.

---
 functions.inc.php | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/functions.inc.php b/functions.inc.php
index c9429456..cb33ce2a 100644
--- a/functions.inc.php
+++ b/functions.inc.php
@@ -1988,7 +1988,13 @@ function db_where_clause($condition, $struct, $additional_raw_where = '', $searc
         } elseif ($operator == "NOTNULL") {
             $querypart = $field . ' IS NOT NULL';
         } else {
+
             $querypart = $field . $operator . "'" . escape_string($value) . "'";
+
+            // might need other types adding here.
+            if (db_pgsql() && in_array($struct[$field]['type'], array('ts', 'num')) && $value === '') {
+                    $querypart = $field . $operator . " NULL";
+            }
         }
 
         if (!empty($struct[$field]['select'])) {