SQL. Calcite: Return human-readable column names for expression results in select

CREATE TABLE t1 ( id INT NOT NULL, int_col INT, PRIMARY KEY (id));
SELECT COUNT(*) FROM t1;
+--------------------------------+
|             EXPR$0             |
+--------------------------------+
+--------------------------------+

 SELECT COUNT(*) FROM t1;
+--------------------------------+
|            COUNT(*)            |
+--------------------------------+
| 0                              |
+--------------------------------+