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Posted to issues@flink.apache.org by "Timo Walther (JIRA)" <ji...@apache.org> on 2017/07/18 09:57:00 UTC
[jira] [Resolved] (FLINK-6891) Add LOG(X) supported in SQL
[ https://issues.apache.org/jira/browse/FLINK-6891?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Timo Walther resolved FLINK-6891.
---------------------------------
Resolution: Fixed
Fix Version/s: 1.4.0
Fixed in 1.4.0: 61d87d7b642080a1b64f5c42cff46d142641bf20
> Add LOG(X) supported in SQL
> ---------------------------
>
> Key: FLINK-6891
> URL: https://issues.apache.org/jira/browse/FLINK-6891
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Affects Versions: 1.4.0
> Reporter: sunjincheng
> Assignee: sunjincheng
> Fix For: 1.4.0
>
>
> LOG(X), LOG(B,X)
> If called with one parameter, this function returns the natural logarithm of X. If X is less than or equal to 0.0E0, the function returns NULL and (as of MySQL 5.7.4) a warning “Invalid argument for logarithm” is reported.
> The inverse of this function (when called with a single argument) is the EXP() function.
> If called with two parameters, this function returns the logarithm of X to the base B. If X is less than or equal to 0, or if B is less than or equal to 1, then NULL is returned.
> * Example:
> LOG(2) -> 0.69314718055995
> LOG(-2) -> NULL
> LOG(2,65536) -> 16
> LOG(10,100) -> 2
> LOG(1,100) -> NULL
> * See more:
> ** [MySQL| https://dev.mysql.com/doc/refman/5.7/en/mathematical-functions.html#function_log]
> --NOTE-- In this JIRA. NULL case will throw IllegalArgumentException.
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