public FieldStorageDefinitionInterface::getColumns()
Returns the field columns, as defined in the field schema.
array[] The array of field columns, keyed by column name, in the same format returned by getSchema().
\Drupal\Core\Field\FieldStorageDefinitionInterface::getSchema()
public function getColumns();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Field!FieldStorageDefinitionInterface.php/function/FieldStorageDefinitionInterface::getColumns/8.1.x