message: Update AST builder cast unit test
  Add `cast(expr("date"), "INTEGER")` test case
diff: @@ -660,7 +660,7 @@ mod tests {
  use crate::{
  ast::DateTimeField,
  ast_builder::{
  - abs, acos, asin, atan, ceil, col, concat, cos, date, degrees, divide, exp, expr,
  + abs, acos, asin, atan, cast, ceil, col, concat, cos, date, degrees, divide, exp, expr,
  extract, floor, format, gcd, generate_uuid, ifnull, lcm, left, ln, log, log10, log2,
  lower, lpad, ltrim, modulo, now, num, pi, position, power, radians, repeat, reverse,
  right, round, rpad, rtrim, sign, sin, sqrt, substr, tan, test_expr, text, time,
  @@ -1194,7 +1194,7 @@ mod tests {
  let expected = "CAST(date AS INTEGER)";
  test_expr(actual, expected);
  - let actual = col("date").cast("INTEGER");
  + let actual = cast(expr("date"), "INTEGER");
  let expected = "CAST(date AS INTEGER)";
  test_expr(actual, expected);
  }
  