Joe McDonnell has posted comments on this change. ( 
http://gerrit.cloudera.org:8080/19083 )

Change subject: IMPALA-11623: Put *-ir.cc files into their own libraries to 
avoid extra recompilation
......................................................................


Patch Set 3:

(1 comment)

This is looking good. Just a minor comment about gen_ir_descriptions.

http://gerrit.cloudera.org:8080/#/c/19083/3/be/src/exprs/CMakeLists.txt
File be/src/exprs/CMakeLists.txt:

http://gerrit.cloudera.org:8080/#/c/19083/3/be/src/exprs/CMakeLists.txt@85
PS3, Line 85: # TODO: Should we depend on gen_ir_descriptions?
To answer this, you can look at what files are being generated by 
gen_ir_descriptions. I see that here:
https://github.com/apache/impala/blob/master/be/src/codegen/gen_ir_descriptions.py#L37-L41
It looks like it generates impala-ir-functions.h and impala-ir-names.h. You can 
use git grep to see what files include that. I see that impala-ir-functions.h 
is included by scalar-expr.h, expr.h, min-max-filter.h, in-list-filter.h. You 
can grep for references to those header files.

My read on this is that Exec, Exprs, Runtime, Service, and Util should have 
gen_ir_descriptions as a dependency (along with some of the *Ir libraries). A 
couple of those might be missing today.

My guess is that there is some way for CMake to handle this automatically, but 
that can be future work.



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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: comment
Gerrit-Change-Id: I63b9285bac6494a19f614d0ebc694a91bdf7a8a0
Gerrit-Change-Number: 19083
Gerrit-PatchSet: 3
Gerrit-Owner: Daniel Becker <[email protected]>
Gerrit-Reviewer: Daniel Becker <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins <[email protected]>
Gerrit-Reviewer: Joe McDonnell <[email protected]>
Gerrit-Comment-Date: Wed, 05 Oct 2022 17:12:32 +0000
Gerrit-HasComments: Yes

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