[Impala-ASF-CR] IMPALA-5210: Count rows and collection items in parquet scanner separately

["Alex Behm (Code Review)" <ge...@cloudera.org>]

Alex Behm has posted comments on this change.

Change subject: IMPALA-5210: Count rows and collection items in parquet scanner separately
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Patch Set 8:

(4 comments)

lgtm after minor comment fixes

http://gerrit.cloudera.org:8080/#/c/7776/8/be/src/exec/hdfs-parquet-scanner.h
File be/src/exec/hdfs-parquet-scanner.h:

Line 478:   /// used to reduce the frequency updating HdfsScanNode counter. It is updated by the
... the frequency of updating the corresponding HdfsScanNode counter.


Line 479:   /// callees of AssembleRows() and is merged into HdfsScanNode counter at the end of
into the HdfsScanNode counter


Line 554:   /// allocated from 'coll_value_builder'. Increases 'this->coll_items_read_counter_' by
this-> is not necessary because our "_" suffix already indicates this is a member


http://gerrit.cloudera.org:8080/#/c/7776/8/be/src/exec/scan-node.h
File be/src/exec/scan-node.h:

Line 153:   /// # nested collection items read from the scanner. For example, for schema
# items the scanner read into CollectionValues. For example, ...

(The new sentence is more accurate because a query  like "select oid from mydb.customers.orders" does scan a nested collection, but the values are materialized into top-level tuples)


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Gerrit-MessageType: comment
Gerrit-Change-Id: I7f6efddaea18507482940f5bdab7326b6482b067
Gerrit-PatchSet: 8
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Tianyi Wang <tw...@cloudera.com>
Gerrit-Reviewer: Alex Behm <al...@cloudera.com>
Gerrit-Reviewer: Dan Hecht <dh...@cloudera.com>
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Tianyi Wang <tw...@cloudera.com>
Gerrit-HasComments: Yes