PERF-269: Optimization: DerivedColumn class so decrease allocation size of MappedColumn - #382
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SergeiPavlov
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DerivedColumn class so decrease allocation size of MappedColumnDerivedColumn class so decrease allocation size of MappedColumn
botinko
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May 20, 2025
botinko
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May 20, 2025
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A typical process has ~4M instances of
MappedColumn.Most of them have
Originpointing tothis.With this PR we introduce
DerivedMappedColumnfor whichOrigin != this(rare case).The typical
MappedColumnobject will allocate 8 bytes less.This will save ~ 35 MB of RAM