map { '!=' : null } in queries to IS NOT NULL via knex's whereNotNull() call

Author: Mike Eldridge

src/index.js

@@ -338,7 +338,11 @@ class DSSqlAdapter {
           if (op === '==' || op === '===') {
             query = query.where(field, v)
           } else if (op === '!=' || op === '!==') {
-            query = query.where(field, '!=', v)
+            if (v === null) {
+              query = query.whereNotNull(field)
+            } else {
+              query = query.where(field, '!=', v)
+            }
           } else if (op === '>') {
             query = query.where(field, '>', v)
           } else if (op === '>=') {