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https://issues.apache.org/jira/browse/IGNITE-20133?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Evgeny Stanilovsky updated IGNITE-20133:
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Fix Version/s: 3.2
(was: 3.1)
> 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
> Priority: Minor
> Labels: ignite-3
> Fix For: 3.2
>
>
> 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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