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https://issues.apache.org/jira/browse/FLINK-6810?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xingcan Cui updated FLINK-6810:
-------------------------------
Description:
In this JIRA, we will create some sub-tasks for adding specific scalar
functions such as mathematical-function {{LOG}}, date-functions
{{DATEADD}}, string-functions {{LPAD}}, etc.
*How to contribute a build-in scalar function*
Thank you very much for contributing a build-in function. In order to make sure
your contributions are in a good direction, it is recommended to read the
following instructions.
# Research the behavior of the function that you are going to contribute in
major DBMSs. This is very important since we have to understand the exact
semantics of the function.
# It is recommended to add function for both sql and table-api (Java and
Scala).
# For every scalar function, add corresponding docs which should include a
SQL, a Java and a Scala version in {{./docs/dev/table/functions.md}}. Make sure
your description of the function is accurate. Please do not copy documentation
from other projects. Especially if other projects are not Apache licensed.
# Take overflow, NullPointerException and other exceptions into consideration.
# Add unit tests for every new function and its supported APIs. Have a look at
{{ScalarFunctionsTest}} for how to implement function tests.
Welcome anybody to add the sub-task about standard database scalar function.
was:
In this JIRA, will create some sub-task for add specific scalar function, such
as mathematical-function {{LOG}}, date-functions
{{DATEADD}},string-functions {{LPAD}}, etc.
*How To Contribute a build-in scalar function*
Thank you very much for contributing a build-in function. In order to make sure
your contributions are in a good direction, it is recommended to read the
following instructions.
# Research the behavior of the function which you are going to contribute in
major DBMSs. This is very important since we have to understand the exact
semantics of the function.
# It is recommended to add function both for sql and table-api.
# Every scalar function should add TableAPI docs in
{{./docs/dev/table/tableApi.md#built-in-functions}}. Add SQL docs in
{{./docs/dev/table/sql.md#built-in-functions}}. When adding docs for table-api,
you should add both scala docs and java docs. Make sure your description of the
function is accurate. Please do not copy documentation from other projects.
Especially if other projects are not Apache licensed.
# Take overflow, NullPointerException and other exceptions into consideration.
# Add unit tests for every new function and its supported APIs. Have a look at
{{ScalarFunctionsTest}} for how to implement function tests.
Welcome anybody to add the sub-task about standard database scalar function.
> Add Some built-in Scalar Function supported
> -------------------------------------------
>
> Key: FLINK-6810
> URL: https://issues.apache.org/jira/browse/FLINK-6810
> Project: Flink
> Issue Type: New Feature
> Components: Table API & SQL
> Affects Versions: 1.4.0
> Reporter: sunjincheng
> Assignee: sunjincheng
> Priority: Major
> Labels: starter
>
> In this JIRA, we will create some sub-tasks for adding specific scalar
> functions such as mathematical-function {{LOG}}, date-functions
> {{DATEADD}}, string-functions {{LPAD}}, etc.
> *How to contribute a build-in scalar function*
> Thank you very much for contributing a build-in function. In order to make
> sure your contributions are in a good direction, it is recommended to read
> the following instructions.
> # Research the behavior of the function that you are going to contribute in
> major DBMSs. This is very important since we have to understand the exact
> semantics of the function.
> # It is recommended to add function for both sql and table-api (Java and
> Scala).
> # For every scalar function, add corresponding docs which should include a
> SQL, a Java and a Scala version in {{./docs/dev/table/functions.md}}. Make
> sure your description of the function is accurate. Please do not copy
> documentation from other projects. Especially if other projects are not
> Apache licensed.
> # Take overflow, NullPointerException and other exceptions into
> consideration.
> # Add unit tests for every new function and its supported APIs. Have a look
> at {{ScalarFunctionsTest}} for how to implement function tests.
> Welcome anybody to add the sub-task about standard database scalar function.
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