sunjincheng created FLINK-6813:
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Summary: Add DATEDIFF as build-in scalar function
Key: FLINK-6813
URL: https://issues.apache.org/jira/browse/FLINK-6813
Project: Flink
Issue Type: Sub-task
Components: Table API & SQL
Affects Versions: 1.4.0
Reporter: sunjincheng
Assignee: sunjincheng
* Syntax
DATEDIFF ( datepart , startdate , enddate )
-datepart
Is the part of startdate and enddate that specifies the type of boundary
crossed.
-startdate
Is an expression that can be resolved to a time, date.
-enddate
Same with startdate.
* Example
SELECT DATEDIFF(year, '2015-12-31 23:59:59.9999999', '2017-01-01
00:00:00.0000000') from tab; --> 2
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