message: Fixing cse test that happened to use substring
diff: @@ -38,11 +38,11 @@ TEST_CASE("Test queries involving Common SubExpressions and Strings and NULL val
  REQUIRE_NO_FAIL(con.Query("insert into test values ('hello'), ('world'), (NULL);"));
  // single CSE in projection
  - result = con.Query("SELECT substring(a, 0, 3)=substring(a, 0, 3) FROM test ORDER BY 1");
  + result = con.Query("SELECT substring(a, 1, 3)=substring(a, 1, 3) FROM test ORDER BY 1");
  REQUIRE(CHECK_COLUMN(result, 0, {Value(), true, true}));
  // now with GROUP BY clause
  - result = con.Query("SELECT substring(a, 0, 3)=substring(a, 0, 3) AS b FROM test GROUP BY b ORDER BY b");
  + result = con.Query("SELECT substring(a, 1, 3)=substring(a, 1, 3) AS b FROM test GROUP BY b ORDER BY b");
  // result->Print();
  REQUIRE(CHECK_COLUMN(result, 0, {Value(), true}));
  }
  