[IMPALA-9570] Document about memory management for writing UDAFs

• Type: Documentation
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Docs
• Epic Color: ghx-label-3
• Assignee: shajini thayasingh
• Reporter: Quanlong Huang
• Created: 30/Mar/20 02:06
• Updated: 21/Dec/20 20:41

Description

In the current document, we have few words about memory management for writing UDAFs: https://impala.apache.org/docs/build/html/topics/impala_udf.html

The only related sentense is "A serialize function that ... frees any memory allocated during the init, update, and merge phases."

We can add more for clarifying it or add this link for further reading: https://github.com/apache/impala/blob/2f53783b14ddf215a4c96bc52a511d3a83896128/be/src/udf/udf.h#L358-L365

BTW, the links of uda-sample.h and uda-sample.cc are not shown:
http://impala.apache.org/docs/build/html/topics/impala_udf.html#uda_functions

They are normal in Cloudera's doc: 
https://docs.cloudera.com/documentation/enterprise/latest/topics/impala_udf.html#uda_functions