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From "godfrey he (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (FLINK-5571) add open and close methods for UserDefinedFunction in TableAPI & SQL
Date Thu, 19 Jan 2017 03:22:26 GMT

     [ https://issues.apache.org/jira/browse/FLINK-5571?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

godfrey he updated FLINK-5571:
------------------------------
    Summary: add open and close methods for UserDefinedFunction in TableAPI & SQL  (was:
add open/close methods for UserDefinedFunction in TableAPI & SQL)

> add open and close methods for UserDefinedFunction in TableAPI & SQL
> --------------------------------------------------------------------
>
>                 Key: FLINK-5571
>                 URL: https://issues.apache.org/jira/browse/FLINK-5571
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API & SQL
>            Reporter: godfrey he
>            Assignee: godfrey he
>
> Currently, a User Defined Function (UDF) in table API & SQL works on zero, one, or
multiple values in custom evaluation method. Many UDFs need more complex features, e.g. report
metrics, get parameters from job configuration, or get extra data from distribute cache file,
etc. Adding open and close methods in UserDefinedFunction class can solve this problem. The
code cloud look like:
> {code}
> trait UserDefinedFunction {
>   def open(context: UDFContext): Unit = {}
>   def close(): Unit = {}
> }
> {code}
> UDFContext contains the information about metric reporters, job parameters, distribute
cache, etc. The code cloud look like:
> {code}
> class UDFContext(val context: RuntimeContext) {
>   def getMetricGroup: MetricGroup = ???
>   def getDistributedCacheFile(name: String): File = ???
>   def getJobParameter(key: String, default: String): String = ???
> }
> {code}



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