CREATE TABLE AS SELECT produces warnings, not errors

create table t10 (a int);

insert into t10 values (1),(2);

MariaDB [test]> create table tmp1 as SELECT * FROM t10 where "x"=0;

ERROR 1292 (22007): Truncated incorrect DECIMAL value: 'x'

MariaDB [test]> create table tmp2 as SELECT * FROM t10 where (a<10 and "x"=0);

Query OK, 2 rows affected, 1 warning (0.009 sec)

Records: 2  Duplicates: 0  Warnings: 1

MariaDB [test]> show warnings;

+---------+------+----------------------------------------+

| Level   | Code | Message                                |

+---------+------+----------------------------------------+

| Warning | 1292 | Truncated incorrect DECIMAL value: 'x' |

+---------+------+----------------------------------------+

1 row in set (0.000 sec)

(gdb) wher 

  #0  THD::really_abort_on_warning 

  #1  0x0000555555f3e15e in THD::raise_condition 

  ...

  #20 0x0000555555e3f3ce in Item::val_bool 

  #21 0x00005555560952ab in Item::eval_const_cond 

  #22 0x000055555643f096 in Item_cond::eval_not_null_tables 

  #23 0x000055555643edb2 in Item_cond::fix_fields 

  #24 0x0000555555e9e590 in Item::fix_fields_if_needed 

  #25 0x0000555555e9e5bd in Item::fix_fields_if_needed_for_scalar 

  #26 0x0000555555f26fdb in Item::fix_fields_if_needed_for_bool 

  #27 0x0000555555f23463 in setup_conds 

  #28 0x0000555556032971 in setup_without_group 

  #29 0x0000555556035b7c in JOIN::prepare 

  Thread 14 "one_connection" hit Hardware watchpoint 3: -location thd->abort_on_warning

  Old value = false

  New value = true

  select_create::prepare (...)  at sql_insert.cc:5011

(gdb) wher 20

  #0  select_create::prepare 

  #1  0x0000555556036dd6 in JOIN::prepare 

  if (!procedure && result && result->prepare(fields_list, unit_arg))

    goto err;					/* purecov: inspected */