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colexec: integrate flat, compact decimal datums #12712

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@cockroach-teamcity

Exalate commented:

cockroachdb/cockroach#74590 --- Release note (performance improvement): The memory representation of DECIMAL datums has been optimized to save space, avoid heap allocations, and eliminate indirection. This increases the speed of DECIMAL arithmetic and aggregation by up to 20%25 on large data sets.

Jira Issue: DOC-2288

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