Github user lionelcao commented on the issue:
https://github.com/apache/carbondata/pull/1192
# Feature Description
This feature is to support ADD & SPLIT partition function on CarbonData.
# Scope
Support range partition and list partition table
# Syntax Example
Suppose one carbon table is list partitioned on COUNTRY column.
Current partition definition is ('China', 'US', 'UK', 'India', 'Canada,
Japan, South Korea, North Korea')
### add a partition
ALTER TABLE t1 ADD PARTITION('Russia')
### split a partition
ALTER TABLE t1 SPLIT PARTITION(5) INTO ('Canada', 'Japan', '(South Korea,
North Korea)')
# Modification
### parser
added new parser to support alter table add/split partition statement
### validate new RangeInfo and ListInfo
ensure new rangeInfo after adding/splitting is in correct order
ensure new added listInfo is not existed before
ensure the target split listInfo could be split
### read target partition data
add function to read data in one segment and one partition
### use ALTER_PARTITION as key of temp directions
add isAltPartitionFlow in getTempStoreLocationKey function
### repartition and write data
decode the partition column and repartition
write to new data blocks
### refresh cache
drop old cache
### multi threads operation in different segments
support make the changing of multiple segments in parallel.
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