Daoyuan Wang 6d94bf6ac1 [SPARK-8174] [SPARK-8175] [SQL] function unix_timestamp, from_unixtime ... unix_timestamp(): long Gets current Unix timestamp in seconds. unix_timestamp(string|date): long Converts time string in format yyyy-MM-dd HH:mm:ss to Unix timestamp (in seconds), using the default timezone and the default locale, return null if fail: unix_timestamp('2009-03-20 11:30:01') = 1237573801 unix_timestamp(string date, string pattern): long Convert time string with given pattern (see [http://docs.oracle.com/javase/tutorial/i18n/format/simpleDateFormat.html]) to Unix time stamp (in seconds), return null if fail: unix_timestamp('2009-03-20', 'yyyy-MM-dd') = 1237532400. from_unixtime(bigint unixtime[, string format]): string Converts the number of seconds from unix epoch (1970-01-01 00:00:00 UTC) to a string representing the timestamp of that moment in the current system time zone in the format of "1970-01-01 00:00:00". Jira: https://issues.apache.org/jira/browse/SPARK-8174 https://issues.apache.org/jira/browse/SPARK-8175 Author: Daoyuan Wang <daoyuan.wang@intel.com> Closes #7644 from adrian-wang/udfunixtime and squashes the following commits: 2fe20c4 [Daoyuan Wang] util.Date ea2ec16 [Daoyuan Wang] use util.Date for better performance a2cf929 [Daoyuan Wang] doc return null instead of 0 f6f070a [Daoyuan Wang] address comments from davies 6a4cbb3 [Daoyuan Wang] temp 56ded53 [Daoyuan Wang] rebase and address comments 14a8b37 [Daoyuan Wang] function unix_timestamp, from_unixtime		2015-07-30 11:14:09 -07:00
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src	[SPARK-8174] [SPARK-8175] [SQL] function unix_timestamp, from_unixtime	2015-07-30 11:14:09 -07:00
pom.xml	[SPARK-7956] [SQL] Use Janino to compile SQL expressions into bytecode	2015-06-04 10:28:59 -07:00