In lvalue context,
$var->{$key}
is equivalent to
( $var //= {} )->{$key}
so
defined( $cg->{mainsnak}{datavalue}{value}{notexist} )
is equivalent to
defined( ( ( ( ( $cg //= {} )->{mainsnak} //= {} )->{datavalue} //= {}
+ )->{value} //= {} )->{notexist} )
That could potentially create a lot of new hashes.
Solution 1:
if ( $cg
&& $cg->{mainsnak}
&& $cg->{mainsnak}{datavalue}
&& $cg->{mainsnak}{datavalue}{value}
&& defined( $cg->{mainsnak}{datavalue}{value}{notexist} )
) {
...
}
Solution 2:
no autovivification;
if (defined( $cg->{mainsnak}{datavalue}{value}{notexist} )) {
...
}
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