[jira] [Created] (TAJO-449) Implement extract() function

["Keuntae Park (JIRA)" <ji...@apache.org>]

Keuntae Park created TAJO-449:
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             Summary: Implement extract() function
                 Key: TAJO-449
                 URL: https://issues.apache.org/jira/browse/TAJO-449
             Project: Tajo
          Issue Type: New Feature
            Reporter: Keuntae Park
            Assignee: Keuntae Park
            Priority: Minor


EXTRACT (*field* FROM *source*)

*source* must be a value expression of type *timestamp*, *time*, or *interval*.
For *date* type, it should be cast to *timestamp* and used.

*field* can be:
- centry
- day: for *timestamp*, the day of the month (1 - 31); for *interval*, the number of days
- decade: the year divided by 10
- dow: the day of the week as Sunday(0) to Saturday(6)
- doy: the day of the year (1 - 365)
- epoch: for *timestamp*, the number of seconds since 1970-01-01 00:00:00 UTC (can be negative); for *interval* values, the total number of seconds in the interval
- hour
- isodow: the day of the week as Monday(1) to Sunday(7)
- isoyear: the ISO 8601 year, which begins with the Monday of the week containing the 4th of January, so in early January or late December the ISO year may be different from the Gregorian year.
- microseconds
- millennium
- minute
- month
- quarter: the quarter of the year (1 - 4)
- second:the seconds field, including fractional parts
- timezone: the time zone offset from UTC, measured in seconds
- timezone_hour: the hour component of the time zone offset
- timezone_minute: the minute component of the time zone offset
- week
- year

Detailed explanation can be found in http://www.postgresql.org/docs/9.1/static/functions-datetime.html




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