Manish Gupta created CARBONDATA-1429:
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Summary: Add a value based compression for decimal data type when
decimal is stored as Int or Long
Key: CARBONDATA-1429
URL: https://issues.apache.org/jira/browse/CARBONDATA-1429
Project: CarbonData
Issue Type: Improvement
Reporter: Manish Gupta
Assignee: Manish Gupta
Priority: Minor
Added a value based compression for decimal data type when decimal is stored as
Int or Long
When decimal precision is <= 9, decimal values are stored in 4 bytes but they
are not compressed further based on min and max values as compared with other
primitive data type compression. Therefore now based on min and max value
decimal data falling in Integer range will be further compressed as byte or
short.
When decimal precision is <= 18, decimal values are stored in 8 bytes but they
are not compressed further based on min and max values as compared with other
primitive data type compression. Therefore now based on min and max value
decimal data falling in Long range will be further compressed as byte, short or
int.
Advantage: This will reduce the storage space thereby decreasing the IO time
while reading and decompressing the data.
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