abstract public Schema::getFieldTypeMap()
Returns a mapping of Drupal schema field names to DB-native field types.
Because different field types do not map 1:1 between databases, Drupal has its own normalized field type names. This function returns a driver-specific mapping table from Drupal names to the native names for each database.
array An array of Schema API field types to driver-specific field types.
abstract public function getFieldTypeMap();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Database!Schema.php/function/Schema::getFieldTypeMap/8.1.x