Roman Puchkovskiy created IGNITE-20133:
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Summary: Compute hashes for integral/decimal columns in a stable
way
Key: IGNITE-20133
URL: https://issues.apache.org/jira/browse/IGNITE-20133
Project: Ignite
Issue Type: Improvement
Reporter: Roman Puchkovskiy
Fix For: 3.0.0-beta2
The idea is to make hash computation for integral and decimal types satisfy the
following property: if a column type is changed from an integral to a decimal
type, the hashes for values that are already stored remain the same.
This will allow us to permit chaning type (integral -> decimal and decimal ->
longer decimal) of a column that is included in a HASH index.
A hash that has this property is the following function:
hash(val.toString(TRIM_TRAILING_ZEROS)). For instance, for 1 it will be
hash("1"), for 1.000 it will also be hash("1"), but for 1.23 it will give
hash("1.23").
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