PostgreSQL implementation of

public Schema::getComment($table, $column = NULL)

protected Schema::alterTable($table, $old_schema, $new_schema, array

protected Schema::createFieldSql($name, $spec)

Specifies installation tasks for SQLite databases. Hierarchy class \Drupal\Core\Database\Install\

public Schema::dropIndex($table, $name) Drop

protected Tasks::connect() Check

protected Tasks::checkEngineVersion()

public Schema::indexExists($table, $name)

protected Schema::getNormalizedIndexes(array $spec)