Sergey Nuyanzin created FLINK-41056:
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Summary: Keep non-compact decimals with unscaled value fitting in
a long as long to avoid BigDecimal on read, add, subtract, cast and deserialize
Key: FLINK-41056
URL: https://issues.apache.org/jira/browse/FLINK-41056
Project: Flink
Issue Type: Technical Debt
Components: Table SQL / Runtime
Reporter: Sergey Nuyanzin
Assignee: Sergey Nuyanzin
"Fits in a long" means that integer unscaled is within
{{Long.MIN_VALUE...Long.MAX_VALUE}}. The fraction is always exact, because the
scale comes from the type and is never rounded away.
Compact decimals (precision <= 18) already work this way through {{longVal}}.
The change lets a non-compact value use it too, whenever its unscaled value
happens to be small enough. {{BigDecimal}} does the same internally with
intCompact and scale.
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