Flink table modules

[Flavio Pompermaier]

Hi to all,

I've seen that table API provides modules. What are they exactly?

Are they basically a way to group together a set of UDF functions?

Or they can add other stuff to the table API?

Best,

Flavi

[Jark Wu-3]

Hi Flavio,

Here is the documentation about "Module": https://ci.apache.org/projects/flink/flink-docs-master/dev/table/modules.html

It is a plugin mechanism for users to register a set of UDF functions, e.g. ML function, Geo functions. 

Best,

Jark

On Thu, 23 Apr 2020 at 23:12, Flavio Pompermaier <[hidden email]> wrote:

Hi to all,

I've seen that table API provides modules. What are they exactly?

Are they basically a way to group together a set of UDF functions?

Or they can add other stuff to the table API?

Best,

Flavi

[Danny Chan]

> Are they basically a way to group together a set of UDF functions

You are right, each module would have a set of functions which behaves like a Flink builtin function, the functions don’t have any namespaces. When there are two objects of the same name residing in two modules, Flink always resolves the object reference to the one in the 1st loaded module. Here is the doc why we evolves this feature [1]

[1] https://cwiki.apache.org/confluence/display/FLINK/FLIP-68%3A+Extend+Core+Table+System+with+Pluggable+Modules

Best,

Danny Chan

在 2020年4月23日 +0800 PM11:12，Flavio Pompermaier <[hidden email]>，写道：

Are they basically a way to group together a set of UDF functions

[Flavio Pompermaier]

Thank you all for the clarification and pointers! 

Il Dom 26 Apr 2020, 10:52 Danny Chan <[hidden email]> ha scritto:

> Are they basically a way to group together a set of UDF functions

You are right, each module would have a set of functions which behaves like a Flink builtin function, the functions don’t have any namespaces. When there are two objects of the same name residing in two modules, Flink always resolves the object reference to the one in the 1st loaded module. Here is the doc why we evolves this feature [1]

[1] https://cwiki.apache.org/confluence/display/FLINK/FLIP-68%3A+Extend+Core+Table+System+with+Pluggable+Modules

Best,

Danny Chan

在 2020年4月23日 +0800 PM11:12，Flavio Pompermaier <[hidden email]>，写道：

Are they basically a way to group together a set of UDF functions