[GitHub] [drill] cgivre opened a new pull request #1680: Drill-7077: Add Function to Facilitate Time Series Analysis

[GitBox <gi...@apache.org>]

cgivre opened a new pull request #1680: Drill-7077: Add Function to Facilitate Time Series Analysis
URL: https://github.com/apache/drill/pull/1680
 
 
   When analyzing time based data, you will often have to aggregate by time grains. While some time grains will be easy to calculate, others, such as quarter, can be quite difficult. These functions enable a user to quickly and easily aggregate data by various units of time. Usage is as follows:
   ```SELECT <fields>
   FROM <data>
   GROUP BY nearestDate(<timestamp_column>, <time increment>
   ```
   So let's say that a user wanted to count the number of hits on a web server per 15 minute, the query might look like this:
   
   ```
   SELECT nearestDate(`eventDate`, '15MINUTE' ) AS eventDate,
   COUNT(*) AS hitCount
   FROM dfs.`log.httpd`
   GROUP BY nearestDate(`eventDate`, '15MINUTE')
   ```
   Currently supports the following time units:
    * YEAR
    * QUARTER
    * MONTH
    * WEEK_SUNDAY
    * WEEK_MONDAY
    * DAY
    * HOUR
    * HALF_HOUR / 30MIN
    * QUARTER_HOUR / 15MIN
    * MINUTE
    * 30SECOND
    * 15SECOND
    * SECOND
   
   There are two versions of the function, one which accepts a date and interval, and the other accepts a string, format string and interval.

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