presto-base-jdbc/src/main/java/io/prestosql/plugin/jdbc/JdbcSplitManager.java/JdbcSplitManager/getSplits
class JdbcSplitManager:    @Override
    public ConnectorSplitSource getSplits(ConnectorTransactionHandle transaction, ConnectorSession session, ConnectorTableHandle table, SplitSchedulingStrategy splitSchedulingStrategy)
    {
        return jdbcClient.getSplits(JdbcIdentity.from(session), (JdbcTableHandle) table);
    }