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Which issue does this PR close?
Closes #3147.
Rationale for this change
In DataFusion, it would be nice to know how much data is allocated so we can bail out early instead of OOMing (a slight over-allocation is OK, so this can be measured after the fact). For that purpose, it would be nice to know how much memory a specific instance of
Field
/DataType
requires.What changes are included in this PR?
DataType::size
andSchema::size
.Are there any user-facing changes?
New methods, not breaking.