[SPARK-3933] Optimize decimal type in Spark SQL for those with small precision - ASF JIRA

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Details

Type: Sub-task
Status: Resolved
Priority: Major
Resolution: Fixed
Affects Version/s: None
Fix Version/s: None
Component/s: SQL
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Description

With fixed-precision decimals, many decimal values will fit in a Long, so we can use a Decimal class with a mutable Long field to represent the unscaled value, rather than allocating a BigDecimal. We can then do some operations directly on these Long fields.