hequn8128 commented on a change in pull request #11724: 
[FLINK-16486][python][docs] Add documentation for vectorized Python UDF
URL: https://github.com/apache/flink/pull/11724#discussion_r408594055
 
 

 ##########
 File path: docs/dev/table/python/vectorized_python_udfs.md
 ##########
 @@ -0,0 +1,62 @@
+---
+title: "Vectorized User-defined Functions"
+nav-parent_id: python_tableapi
+nav-pos: 30
+---
+<!--
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+-->
+
+Vectorized user-defined functions are functions which are executed by 
transferring a batch of elements between JVM and Python VM in Arrow columnar 
format.
+It shares the similar way as the [non-vectorized user-defined functions]({{ 
site.baseurl }}/dev/table/python/python_udfs.html) on how to
+define vectorized user-defined functions. Users only need to add an extra 
parameter udf_type="pandas" in the decorator `udf` to mark it as a vectorized 
user-defined function.
 
 Review comment:
   change to \`udf_type="pandas"\`

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