title: want to understand the query execution plan for Apache Phoenix
body: <p>I want to understand the query execution plan for Phoenix. I am executing below command to get query execution plan.</p>
  
  <p><strong>Command: -</strong></p>
  
  <pre><code>explain select "col1","col2", count(*) as "Count" from "tab_name" group by "col1","col2";
  </code></pre>
  
  <p><strong>Explain Plan: -</strong></p>
  
  <pre><code>+----------------------------------------------------------------------------------------------------------+
  |                   PLAN                                                                                                     |
  +----------------------------------------------------------------------------------------------------------+
  |CLIENT 85-CHUNK PARALLEL 85-WAY FULL SCAN OVER tab_name                                                                                                                  |
  |     SERVER AGGREGATE INTO DISTINCT ROWS BY [d."col1", d."col2"]  |
  | CLIENT MERGE SORT                                                                                          |
  +----------------------------------------------------------------------------------------------------------+
  </code></pre>
  
  <p>Can any one help me to understand the Phoenix query execution plan.</p>
  
  <p>Thanks in adv.</p>