ShreelekhyaG opened a new pull request #4151:
URL: https://github.com/apache/carbondata/pull/4151
### Why is this PR needed?
When multiple inserts with single query is used, it fails from SparkPlan
with: `java.lang.ClassCastException: GenericInternalRow cannot be cast to
UnsafeRow`.
For every successful insert/load we return Segment ID as a row. For multiple
inserts also, we are returning a row containing Segment ID but while processing
in spark `ClassCastException` is thrown.
### What changes were proposed in this PR?
When multiple insert query is given, it uses `Union` node. Based on its
presence, made changes to use flag `isMultipleInserts` to identify and return
empty row.
### Does this PR introduce any user interface change?
- No
### Is any new testcase added?
- Yes
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