From e7ccb0b70707067961cf43cf7219ee586ec95db8 Mon Sep 17 00:00:00 2001
From: "Levy A." <levyddsa@gmail.com>
Date: Thu, 5 Jun 2025 17:39:13 -0300
Subject: [PATCH] fix: prevent duplicate columns

---
 core/translate/alter.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/core/translate/alter.rs b/core/translate/alter.rs
index 84173d394..e07ca6470 100644
--- a/core/translate/alter.rs
+++ b/core/translate/alter.rs
@@ -220,6 +220,12 @@ pub fn translate_alter_table(
                 )));
             };
 
+            if btree.get_column(&rename_to).is_some() {
+                return Err(LimboError::ParseError(format!(
+                    "duplicate column name: \"{rename_from}\""
+                )));
+            };
+
             let sqlite_schema = schema
                 .get_btree_table(SQLITE_TABLEID)
                 .expect("sqlite_schema should be on schema");