Error on clause that should not be evaluated

SELECT * FROM (
 SELECT * FROM (
  SELECT '1d28' a ) 
 WHERE regexp_matches(a,'^[0-9]*$')) /* Keep only row on INT format */
WHERE CAST(a AS INT) < 2000;         /* This CAST should't failed due */ 
                                     /* to filtering in the inner queries */
=>
Error: SYSTEM ERROR: NumberFormatException: 1d28

/* Just adding another row and it's work ! */
SELECT * FROM (
 SELECT * FROM (
  SELECT '1d28' a UNION SELECT '2a2')
 WHERE regexp_matches(a,'^[0-9]*$'))
WHERE CAST(a AS INT) < 2000;
=>
+---+
| a |
+---+
+---+

// MyFile.csvh
a,b
1,2
a1a,3
// !MyFile.csvh 

SELECT * FROM (
 SELECT * FROM ....`MyFile.csvh ` WHERE regexp_matches(a,'^[0-9]*$')) AS x WHERE CAST(a AS INT) < 200;
=>
+---+---+
| a | b |
+---+---+
| 1 | 2 |
+---+---+