table name

common/src/alias.rs

@@ -9,6 +9,13 @@ use unicode_properties::{GeneralCategoryGroup, UnicodeEmoji, UnicodeGeneralCateg
 /// labels in a few query paths, so the limit is measured in UTF-8 bytes.
 pub const MAX_ALIAS_BYTES: usize = 63;
 
+/// The case-insensitive key used to compare public table names. Table names
+/// have a deliberately small ASCII vocabulary, so PostgreSQL's `lower()` and
+/// this function produce the same stored key.
+pub fn canonical_table_name(table_name: &str) -> String {
+    table_name.to_ascii_lowercase()
+}
+
 /// Whether a display alias contains control, formatting, private-use, or
 /// unassigned characters that should never be persisted as visible naming.
 pub fn has_disallowed_alias_characters(alias: &str) -> bool {
@@ -68,6 +75,11 @@ pub fn canonical_alias(alias: &str) -> String {
 mod tests {
     use super::*;
 
+    #[test]
+    fn table_names_compare_without_ascii_case() {
+        assert_eq!(canonical_table_name("Sales-2026_Q4"), "sales-2026_q4");
+    }
+
     #[test]
     fn aliases_compare_by_compatibility_case_and_without_emoji() {
         assert_eq!(canonical_alias("Apple"), "apple");