protected SqlContentEntityStorageSchema::addSharedTableFieldIndex(FieldStorageDefinitionInterface $storage_definition, &$schema, $not_null = FALSE, $size = NULL)
Adds an index for the specified field to the given schema definition.
\Drupal\Core\Field\FieldStorageDefinitionInterface $storage_definition: The storage definition of the field for which an index should be added.
array $schema: A reference to the schema array to be updated.
bool $not_null: (optional) Whether to also add a 'not null' constraint to the column being indexed. Doing so improves index performance. Defaults to FALSE, in case the field needs to support NULL values.
int $size: (optional) The index size. Defaults to no limit.
protected function addSharedTableFieldIndex(FieldStorageDefinitionInterface $storage_definition, &$schema, $not_null = FALSE, $size = NULL) { $name = $storage_definition->getName(); $real_key = $this->getFieldSchemaIdentifierName($storage_definition->getTargetEntityTypeId(), $name); $schema['indexes'][$real_key] = array($size ? array($name, $size) : $name); if ($not_null) { $schema['fields'][$name]['not null'] = TRUE; } }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Sql!SqlContentEntityStorageSchema.php/function/SqlContentEntityStorageSchema::addSharedTableFieldIndex/8.1.x