</small>
    <div class="hidden name"><code>ex_data_table_parallel.Rd</code></div>
    </div>

    <div class="ref-description">
    <p>Execute an <code>rquery</code> pipeline with <code>data.table</code> in parallel, partitioned by a given column.
Note: usually the overhead of partitioning and distributing the work will by far overwhelm any parallel speedup.
Also <code>data.table</code> itself already seems to exploit some thread-level parallelism (one often sees user time &gt; elapsed time).
Requires the 