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Posted to issues@flink.apache.org by "sunjincheng (JIRA)" <ji...@apache.org> on 2017/06/12 08:42:00 UTC
[jira] [Created] (FLINK-6891) Add LOG supported in SQL
sunjincheng created FLINK-6891:
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Summary: Add LOG 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
LONG (N) A single parameter version of the function returns the natural logarithm of N, and if two arguments are called, it returns any radix of the logarithm of N.
* Syntax:
LOG ( float_expression [, base ] )
* Arguments
**float_expression: Is an expression of type float or of a type that can be implicitly converted to float.
**base: Optional integer argument that sets the base for the logarithm.
* Return Types
float
* Example:
LOG(10) -> 2.30
*See more:
**[MSQL|https://docs.microsoft.com/en-us/sql/t-sql/functions/log-transact-sql]
**[MySQL| https://dev.mysql.com/doc/refman/5.7/en/mathematical-functions.html#function_log]
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