PERF-269: Optimization: DerivedColumn class so decrease allocation size of MappedColumn
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SergeiPavlov
changed the title
DerivedColumn class so decrease allocation size of MappedColumnDerivedColumn class so decrease allocation size of MappedColumn
botinko
reviewed
May 20, 2025
botinko
approved these changes
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