Zoltan Borok-Nagy has posted comments on this change. ( 
http://gerrit.cloudera.org:8080/18704 )

Change subject: IMPALA-11350: Add virtual column FILE__POSITION for Parquet 
tables
......................................................................


Patch Set 2:

(1 comment)

http://gerrit.cloudera.org:8080/#/c/18704/2/be/src/exec/hdfs-scan-node-base.cc
File be/src/exec/hdfs-scan-node-base.cc:

http://gerrit.cloudera.org:8080/#/c/18704/2/be/src/exec/hdfs-scan-node-base.cc@999
PS2, Line 999: else if (sd->virtual_column_type() == 
TVirtualColumnType::FILE_POSITION) {
             :       return false;
> Should this return true?
No, in the template tuple of a scanner we only set slots that are constant for 
the file being scanned. E.g. partition slots, INPUT__FILE__NAME, etc.

FILE_POSITION is different for each row, so we cannot set it in the template 
tuple.



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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: comment
Gerrit-Change-Id: I4ef72c683d0d5ae2898bca36fa87e74b663671f7
Gerrit-Change-Number: 18704
Gerrit-PatchSet: 2
Gerrit-Owner: Zoltan Borok-Nagy <borokna...@cloudera.com>
Gerrit-Reviewer: Anonymous Coward <lipeng...@sensorsdata.cn>
Gerrit-Reviewer: Gabor Kaszab <gaborkas...@cloudera.com>
Gerrit-Reviewer: Gergely Fürnstáhl <gfurnst...@cloudera.com>
Gerrit-Reviewer: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
Gerrit-Reviewer: Tamas Mate <tma...@apache.org>
Gerrit-Reviewer: Zoltan Borok-Nagy <borokna...@cloudera.com>
Gerrit-Comment-Date: Wed, 06 Jul 2022 11:38:16 +0000
Gerrit-HasComments: Yes

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