Optional JoinColumn in ManyToOne

[jusstinas]

doctrine-bulk/src/SixDreams/Bulk/MetadataLoader.php

Line 83 in 88c9681

$nullable = ($association['type'] === ClassMetadataInfo::ONE_TO_ONE || (bool) $column['nullable']);

In ManyToOne association JoinColumn annotation is optional and looks like then default value for nullable is true.
In this case array key nullable in $column doesn't exists.