From 10c69b910ec3fbb74036b282b7b16bd3b68bc1b3 Mon Sep 17 00:00:00 2001
From: PThorpe92 <preston@turso.tech>
Date: Thu, 16 Oct 2025 16:39:10 -0400
Subject: [PATCH] Prevent ambiguous self-join table reference

---
 core/translate/select.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/core/translate/select.rs b/core/translate/select.rs
index 59b6ff6cb..376745f77 100644
--- a/core/translate/select.rs
+++ b/core/translate/select.rs
@@ -225,6 +225,16 @@ fn prepare_one_select_plan(
                 &mut table_references,
                 connection,
             )?;
+            // Validate that all table references have unique identifiers
+            let mut seen_identifiers = std::collections::HashSet::new();
+            for table in table_references.joined_tables().iter() {
+                if !seen_identifiers.insert(&table.identifier) {
+                    crate::bail_parse_error!(
+                "table name {} specified more than once - use aliases to distinguish multiple references",
+                table.identifier
+            );
+                }
+            }
 
             // Preallocate space for the result columns
             let result_columns = Vec::with_capacity(