kunal642 opened a new pull request #3822:
URL: https://github.com/apache/carbondata/pull/3822
### Why is this PR needed?
Load data is failing with "Unsupported dataType: String" exception when
null data is loaded into a string column in global_sort table as there is No
handling for null data for string column
### What changes were proposed in this PR?
Added a check for null data and handle for the same in global sort flow.
### 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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