fix(sundb): stop quoting simple identifiers in generated SQL

crates/dbx-sql-data/src/data_grid_sql.rs

@@ -4504,6 +4504,29 @@ mod tests {
         }
     }
 
+    fn sundb_people_save_options() -> DataGridSaveStatementOptions {
+        let mut options = mysql_people_save_options(1);
+        options.database_type = Some(DatabaseType::Sundb);
+        // SUNDB resolves unquoted names case-insensitively (folding to uppercase), so the
+        // grid must not quote them: a quoted `"rs_salest_budget"` preserved the case and
+        // matched nothing (#11986).
+        options.table_meta.table_name = "rs_salest_budget".to_string();
+        options.table_meta.schema = None;
+        options.dirty_rows = vec![(0, vec![(1, json!("blocked"))])];
+        options
+    }
+
+    #[test]
+    fn sundb_grid_save_leaves_simple_identifiers_unquoted() {
+        let statements =
+            build_data_grid_save_statements(&sundb_people_save_options(), None, &mut Vec::new(), &mut Vec::new());
+
+        assert_eq!(statements.len(), 1);
+        assert!(statements[0].starts_with("UPDATE rs_salest_budget SET "), "{}", statements[0]);
+        assert!(statements[0].contains("WHERE id = 1"), "{}", statements[0]);
+        assert!(!statements[0].contains("\"rs_salest_budget\""), "{}", statements[0]);
+    }
+
     fn mysql_people_save_options(row_count: usize) -> DataGridSaveStatementOptions {
         DataGridSaveStatementOptions {
             database_type: Some(DatabaseType::Mysql),

crates/dbx-sql-dialect/src/sql_dialect/identifiers.rs

@@ -169,6 +169,13 @@ pub fn quote_table_identifier(database_type: Option<DatabaseType>, name: &str) -
             format!("`{}`", name.replace('`', "``"))
         }
         Some(DatabaseType::Informix) if is_simple_informix_identifier(name) => name.to_string(),
+        // SUNDB folds unquoted identifiers to uppercase (its JDBC driver reports
+        // storesUpperCaseIdentifiers=true / supportsMixedCaseIdentifiers=false), so
+        // `select * from rs_salest_budget` resolves to RS_SALEST_BUDGET. Quoting the
+        // name preserves its case instead, and the generated UPDATE then finds no such
+        // table (#11986). Emit simple names unquoted, as Informix does; a name that
+        // needs quoting keeps the generic double-quote form.
+        Some(DatabaseType::Sundb) if is_simple_informix_identifier(name) => name.to_string(),
         Some(DatabaseType::Neo4j) => format!("`{}`", name.replace('`', "``")),
         Some(DatabaseType::Nebula) => format!("`{}`", name.replace('\\', "\\\\").replace('`', "\\`")),
         Some(DatabaseType::SqlServer) => format!("[{}]", name.replace(']', "]]")),

crates/dbx-sql-dialect/src/sql_dialect/tests.rs

@@ -33,6 +33,12 @@ fn quotes_identifiers_by_database_type() {
     assert_eq!(quote_table_identifier(Some(DatabaseType::Gaussdb), "\"MixedCase\""), "\"MixedCase\"");
     assert_eq!(quote_table_identifier(Some(DatabaseType::OpenGauss), "\"MixedCase\""), "\"MixedCase\"");
     assert_eq!(quote_table_identifier(Some(DatabaseType::Informix), "users_1"), "users_1");
+    // SUNDB folds unquoted names to uppercase, so a simple lowercase name must stay
+    // unquoted; quoting it preserved the case and the statement found no such table (#11986).
+    assert_eq!(quote_table_identifier(Some(DatabaseType::Sundb), "rs_salest_budget"), "rs_salest_budget");
+    assert_eq!(quote_table_identifier(Some(DatabaseType::Sundb), "YEAR"), "YEAR");
+    assert_eq!(quote_table_identifier(Some(DatabaseType::Sundb), "user name"), "\"user name\"");
+    assert_eq!(quote_table_identifier(Some(DatabaseType::Sundb), "user\"name"), "\"user\"\"name\"");
     assert_eq!(quote_table_identifier(Some(DatabaseType::Jdbc), "users_1"), "users_1");
     assert_eq!(quote_table_identifier(Some(DatabaseType::Jdbc), "user name"), "user name");
     assert_eq!(quote_table_identifier(Some(DatabaseType::Iotdb), "root.test.device2"), "root.test.device2");