VenuReddy2103 opened a new pull request #3725:
URL: https://github.com/apache/carbondata/pull/3725
### Why is this PR needed?
Alter table drop column on main table when droping columns match to a
secondary index table columns is actually not dropping secondary index table.
### What changes were proposed in this PR?
1. Have corrected the `dropApplicableSITables` to check if the drop columns
are matching the index table columns. If all columns of a index table match to
drop columns, then drop the index table itself.
2. Index table refresh was missed in `CarbonCreateSecondaryIndexCommand`. It
was missed in secondary index feature PR.
### Does this PR introduce any user interface change?
- No
### Is any new testcase added?
- Yes
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