feat: WEEKDAY logic for mssql

packages/nocodb/src/lib/db/sql-data-mapper/lib/sql/functionMappings/mssql.ts

@@ -108,6 +108,24 @@ const mssql = {
       END${colAlias}`
     );
   },
+  WEEKDAY: ({ fn, knex, pt, colAlias }: MapFnArgs) => {
+    // DATEPART(WEEKDAY, DATE): sunday = 1, monday = 2, ..., saturday = 7
+    // WEEKDAY() returns an index from 0 to 6 for Monday to Sunday
+    const m = {
+      monday: 0,
+      tuesday: 1,
+      wednesday: 2,
+      thursday: 3,
+      friday: 4,
+      saturday: 5,
+      sunday: 6,
+    };
+    return knex.raw(
+      `(DATEPART(WEEKDAY, ${fn(pt.arguments[0])}) - 2 - ${
+        m[pt?.arguments[1]?.value.toLowerCase()] || 0
+      } % 7 + 7) % 7 ${colAlias}`
+    );
+  },
 };
 
 export default mssql;