Pickupolddriver opened a new pull request #4032:
URL: https://github.com/apache/carbondata/pull/4032
### Why is this PR needed?
In order to support MERGE INTO SQL Command in Carbondata
The previous Scala Parser having trouble to parse the complicated Merge Into
SQL Command
### What changes were proposed in this PR?
Add an ANTLR parser, and support parse MERGE INTO SQL Command to DataSet
Command
### Does this PR introduce any user interface change?
- Yes.
The PR introduces the MERGE INTO SQL Command.
### Is any new testcase added?
- Yes
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