add support for unicode NOCASE comparisons with the built-in SQLite

see #155

Author: lovasoa

src/webserver/database/connect.rs

@@ -127,5 +127,7 @@ fn set_custom_connect_options(options: &mut AnyConnectOptions, config: &AppConfi
             log::info!("Loading SQLite extension: {}", extension_name);
             *sqlite_options = std::mem::take(sqlite_options).extension(extension_name.clone());
         }
+        *sqlite_options = std::mem::take(sqlite_options)
+            .collation("NOCASE", |a, b| a.to_lowercase().cmp(&b.to_lowercase()));
     }
 }

tests/sql_test_files/it_works_sqlite_unicode_nocase.sql

@@ -0,0 +1,6 @@
+-- Checks that the NOCASE collation is working correctly with unicode characters.
+select 'text' as component,
+    case
+        when 'é' = 'É' COLLATE NOCASE then 'It works !'
+        else 'It failed ! Expected "é" = "É" COLLATE NOCASE.'
+    end as contents;