From ea68b54d2db8c61941746c61e4e74ee1b56c560c Mon Sep 17 00:00:00 2001
From: Wing-Kam Wong <wingkwong.code@gmail.com>
Date: Sat, 7 Jan 2023 13:48:51 +0800
Subject: [PATCH] fix(nocodb): SUBSTR for postgres

---
 .../db/sql-data-mapper/lib/sql/functionMappings/pg.ts  | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/packages/nocodb/src/lib/db/sql-data-mapper/lib/sql/functionMappings/pg.ts b/packages/nocodb/src/lib/db/sql-data-mapper/lib/sql/functionMappings/pg.ts
index 1157d853cf..93f3296ff5 100644
--- a/packages/nocodb/src/lib/db/sql-data-mapper/lib/sql/functionMappings/pg.ts
+++ b/packages/nocodb/src/lib/db/sql-data-mapper/lib/sql/functionMappings/pg.ts
@@ -138,6 +138,16 @@ const pg = {
         .toQuery()} THEN 1 ELSE 0 END ${args.colAlias}`
     );
   },
+  SUBSTR: ({ fn, knex, pt, colAlias }: MapFnArgs) => {
+    const str = fn(pt.arguments[0]);
+    const positionFrom = fn(pt.arguments[1] ?? 1);
+    const numberOfCharacters = fn(pt.arguments[2] ?? '');
+    return knex.raw(
+      `SUBSTR(${str}::TEXT, ${positionFrom}${
+        numberOfCharacters ? ', ' + numberOfCharacters : ''
+      })${colAlias}`
+    );
+  },
 };
 
 export default pg;