Kathy Sun has posted comments on this change.

Change subject: IMPALA-4024: Add "system" database and expose Impala metrics as 
a table
......................................................................


Patch Set 19:

(4 comments)

1.Refactor code in system-table-scan-node
remove functions and variables that could be avoid.
2. revise Authz-test

http://gerrit.cloudera.org:8080/#/c/3863/18/be/src/exec/system-table-scan-node.cc
File be/src/exec/system-table-scan-node.cc:

PS18, Line 94: 
> probably not.
Done


http://gerrit.cloudera.org:8080/#/c/3863/18/be/src/exec/system-table-scanner.h
File be/src/exec/system-table-scanner.h:

Line 38: 
> I think I did batched GetNext()  (1024 rows per batch)
Done


Line 40:   virtual Status Open() = 0;
> But I do need size() to serve 1024 batch feature. to decide the size of nex
Done


http://gerrit.cloudera.org:8080/#/c/3863/18/fe/src/main/java/com/cloudera/impala/catalog/Db.java
File fe/src/main/java/com/cloudera/impala/catalog/Db.java:

Line 496:   @Override
> I don't think we need hashCode() and equals() do we?
Done


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Gerrit-MessageType: comment
Gerrit-Change-Id: I7adbeb45220c468e43b424d70c30b952f6cec2cd
Gerrit-PatchSet: 19
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Kathy Sun <kathy....@cloudera.com>
Gerrit-Reviewer: Kathy Sun <kathy....@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <tarmstr...@cloudera.com>
Gerrit-HasComments: Yes

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