From 1102be7cf8448ef62f999640b76676ffe574ea8e Mon Sep 17 00:00:00 2001
From: Wing-Kam Wong <wingkwong.code@gmail.com>
Date: Fri, 9 Dec 2022 18:52:15 +0800
Subject: [PATCH] fix(nocodb): empty result when identifier is null

---
 .../lib/sql/formulav2/formulaQueryBuilderv2.ts     | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/packages/nocodb/src/lib/db/sql-data-mapper/lib/sql/formulav2/formulaQueryBuilderv2.ts b/packages/nocodb/src/lib/db/sql-data-mapper/lib/sql/formulav2/formulaQueryBuilderv2.ts
index 0c382ea3b4..5ce2ade250 100644
--- a/packages/nocodb/src/lib/db/sql-data-mapper/lib/sql/formulav2/formulaQueryBuilderv2.ts
+++ b/packages/nocodb/src/lib/db/sql-data-mapper/lib/sql/formulav2/formulaQueryBuilderv2.ts
@@ -664,6 +664,20 @@ export default async function formulaQueryBuilderv2(
         sql = `COALESCE(${left}, '') ${pt.operator} COALESCE(${right},'')${colAlias}`;
       }
 
+      if (knex.clientType() === 'mysql2') {
+        sql = `IFNULL(${left} ${pt.operator} ${right}, ${
+          pt.operator === '='
+            ? pt.left.type === 'Literal'
+              ? pt.left.value === ''
+              : pt.right.value === ''
+            : pt.operator === '!='
+            ? pt.left.type !== 'Literal'
+              ? pt.left.value === ''
+              : pt.right.value === ''
+            : 0
+        }) ${colAlias}`;
+      }
+
       const query = knex.raw(sql);
       if (prevBinaryOp && pt.operator !== prevBinaryOp) {
         query.wrap('(', ')');