QiangCai opened a new pull request #3868:
URL: https://github.com/apache/carbondata/pull/3868
### Why is this PR needed?
1. Redundant 'if' statement
2. Array access many times in for loop
3. Repeated switch branch
4. Use StringBuffer
### What changes were proposed in this PR?
1. Change redundant 'if' statement
2. Use enhanced for loop
3. Merge switch branch
4. Use StringBuilder instead of StringBuffer
### Does this PR introduce any user interface change?
- No
- Yes. (please explain the change and update document)
### Is any new testcase added?
- No
- Yes
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