Anonymous Coward (339) has posted comments on this change. ( 
http://gerrit.cloudera.org:8080/18430 )

Change subject: IMPALA-11233: Unset all query option
......................................................................


Patch Set 6:

(1 comment)

http://gerrit.cloudera.org:8080/#/c/18430/6/fe/src/main/java/org/apache/impala/analysis/SetStmt.java
File fe/src/main/java/org/apache/impala/analysis/SetStmt.java:

http://gerrit.cloudera.org:8080/#/c/18430/6/fe/src/main/java/org/apache/impala/analysis/SetStmt.java@30
PS6, Line 30: private final boolean isSetAll_;
            :   private boolean isUnsetAll_;
Seems like the `SetStmt` can only be one of the following modes:
- set one (key, value)
- set all
- unset all

How about using an enum to indicate the modes, so that we can use `switch ... 
case ...` to replace the `if` statements in the `toSql()` and `toThrift()` 
functions. It can also help to improve the code readability and maintainability.

The enum can be designed to have three options:
- SetOne
- SetAll
- UnSetAll



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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: comment
Gerrit-Change-Id: Iabf23622daab733ddab20dd3ca73af6c9bd5c250
Gerrit-Change-Number: 18430
Gerrit-PatchSet: 6
Gerrit-Owner: Xiaoqing Gao <[email protected]>
Gerrit-Reviewer: Anonymous Coward (339)
Gerrit-Reviewer: Gabor Kaszab <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins <[email protected]>
Gerrit-Reviewer: Quanlong Huang <[email protected]>
Gerrit-Reviewer: Xiaoqing Gao <[email protected]>
Gerrit-Comment-Date: Fri, 27 May 2022 12:40:22 +0000
Gerrit-HasComments: Yes

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