Manish Gupta created CARBONDATA-797:
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Summary: Data loss for BigInt datatype if data contains long max
and min values
Key: CARBONDATA-797
URL: https://issues.apache.org/jira/browse/CARBONDATA-797
Project: CarbonData
Issue Type: Bug
Reporter: Manish Gupta
Assignee: Manish Gupta
Fix For: 1.1.0-incubating
When data contains long max and min values for a measure column with bigInt
datatype, the delta compression selected is DATA_BYTE which is incorrect. For
selecting the delta compression min value is decremented from max value and
here the min value is negative, so it performs addition operation and goes out
of long range. When a long value goes out of range it starts again from the
long max negative value which results in wrong compression selection.
This leads to data loss and incorrect query results.
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