A list of field names per table.
This corresponds to the return value of TableMappingInterface::getFieldNames() except that this variable is additionally keyed by table name.
Type: array[]
protected $fieldNames = array();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Sql!DefaultTableMapping.php/property/DefaultTableMapping::fieldNames/8.1.x