presto-base-jdbc/src/main/java/io/prestosql/plugin/jdbc/BaseJdbcClient.java/BaseJdbcClient/getSchemaNames
class BaseJdbcClient:    @Override
    public final Set<String> getSchemaNames(JdbcIdentity identity)
    {
        try (Connection connection = connectionFactory.openConnection(identity)) {
            return listSchemas(connection).stream()
                    .map(schemaName -> schemaName.toLowerCase(ENGLISH))
                    .collect(toImmutableSet());
        }
        catch (SQLException e) {
            throw new PrestoException(JDBC_ERROR, e);
        }
    }