A list of all database columns per table.
This corresponds to the return value of TableMappingInterface::getAllColumns() except that this variable is additionally keyed by table name.
This data is derived from static::$storageDefinitions, static::$fieldNames, and static::$extraColumns, but is stored separately to avoid repeated processing.
Type: array[]
protected $allColumns = array();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Sql!DefaultTableMapping.php/property/DefaultTableMapping::allColumns/8.1.x