presto-phoenix/src/main/java/io/prestosql/plugin/phoenix/PhoenixSplitManager.java/PhoenixSplitManager/getSplits
class PhoenixSplitManager:    private List<InputSplit> getSplits(PhoenixPreparedStatement inputQuery)
            throws IOException
    {
        QueryPlan queryPlan = phoenixClient.getQueryPlan(inputQuery);
        return generateSplits(queryPlan, queryPlan.getSplits());
    }