From 45d959635cf17454501b2036017971a640d7be77 Mon Sep 17 00:00:00 2001
From: "Levy A." <levyddsa@gmail.com>
Date: Tue, 12 Aug 2025 17:59:38 -0300
Subject: [PATCH 1/2] fix: check if index exists with the same name

---
 core/translate/alter.rs  |  8 +++++++-
 testing/alter_table.test | 12 ++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/core/translate/alter.rs b/core/translate/alter.rs
index 1613aeae4..8df31d58a 100644
--- a/core/translate/alter.rs
+++ b/core/translate/alter.rs
@@ -323,7 +323,13 @@ pub fn translate_alter_table(
         ast::AlterTableBody::RenameTo(new_name) => {
             let new_name = new_name.as_str();
 
-            if schema.get_table(new_name).is_some() {
+            if schema.get_table(new_name).is_some()
+                || schema
+                    .indexes
+                    .values()
+                    .flatten()
+                    .any(|index| index.name == normalize_ident(new_name))
+            {
                 return Err(LimboError::ParseError(format!(
                     "there is already another table or index with this name: {new_name}"
                 )));
diff --git a/testing/alter_table.test b/testing/alter_table.test
index 24bf74fe8..6f44b9ad1 100755
--- a/testing/alter_table.test
+++ b/testing/alter_table.test
@@ -126,3 +126,15 @@ do_execsql_test_in_memory_any_error fail-alter-table-drop-primary-key-column-con
     CREATE TABLE t (a, b, PRIMARY KEY (a));
     ALTER TABLE t DROP a;
 }
+
+do_execsql_test_in_memory_any_error fail-alter-table-rename-to-existing-index {
+    CREATE TABLE x (a);
+    CREATE INDEX y ON x (a);
+    ALTER TABLE x RENAME TO y;
+}
+
+do_execsql_test_in_memory_any_error fail-alter-table-rename-to-existing-table {
+    CREATE TABLE x (a);
+    CREATE TABLE y (a);
+    ALTER TABLE x RENAME TO y;
+}

From 6a37916b4983c748d83e97c75209f62adf9f7784 Mon Sep 17 00:00:00 2001
From: "Levy A." <levyddsa@gmail.com>
Date: Tue, 12 Aug 2025 22:43:37 -0300
Subject: [PATCH 2/2] fix: rename indexed columns

---
 core/vdbe/execute.rs | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/core/vdbe/execute.rs b/core/vdbe/execute.rs
index fda2982a7..f5e9c254d 100644
--- a/core/vdbe/execute.rs
+++ b/core/vdbe/execute.rs
@@ -7267,7 +7267,7 @@ pub fn op_rename_column(
 ) -> Result<InsnFunctionStepResult> {
     load_insn!(
         RenameColumn {
-            table,
+            table: table_name,
             column_index,
             name
         },
@@ -7279,7 +7279,7 @@ pub fn op_rename_column(
     conn.with_schema_mut(|schema| {
         let table = schema
             .tables
-            .get_mut(table)
+            .get_mut(table_name)
             .expect("table being renamed should be in schema");
 
         let table = Arc::make_mut(table);
@@ -7294,6 +7294,20 @@ pub fn op_rename_column(
             .columns
             .get_mut(*column_index)
             .expect("renamed column should be in schema");
+
+        if let Some(indexes) = schema.indexes.get_mut(table_name) {
+            for index in indexes {
+                let index = Arc::make_mut(index);
+                for index_column in &mut index.columns {
+                    if index_column.name
+                        == *column.name.as_ref().expect("btree column should be named")
+                    {
+                        index_column.name = name.to_owned();
+                    }
+                }
+            }
+        }
+
         column.name = Some(name.to_owned());
     });