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Posted to dev@flink.apache.org by "dalongliu (Jira)" <ji...@apache.org> on 2022/03/31 07:16:00 UTC

[jira] [Created] (FLINK-26945) Add DATE_SUB supported in SQL & Table API

dalongliu created FLINK-26945:
---------------------------------

             Summary: Add DATE_SUB supported in SQL & Table API
                 Key: FLINK-26945
                 URL: https://issues.apache.org/jira/browse/FLINK-26945
             Project: Flink
          Issue Type: Sub-task
          Components: Table SQL / API
            Reporter: dalongliu
             Fix For: 1.16.0


Returns the date {{numDays}} before {{{}startDate{}}}.

Syntax:
{code:java}
date_sub(startDate, numDays) {code}
Arguments:
 * {{{}startDate{}}}: A DATE expression.

 * {{{}numDays{}}}: An INTEGER expression.

Returns:

A DATE.

If {{numDays}} is negative abs(num_days) are added to {{{}startDate{}}}.

If the result date overflows the date range the function raises an error.

Examples:
{code:java}
> SELECT date_sub('2016-07-30', 1);
 2016-07-29 {code}
See more:
 * [Spark|https://spark.apache.org/docs/latest/sql-ref-functions-builtin.html#date-and-timestamp-functions]
 * [Hive|https://cwiki.apache.org/confluence/display/hive/languagemanual+udf]



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