Oleg Utkin

Use btree to search fields in DFSchema

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## Which issue does this PR close? Part of #7698. ## Rationale for this change Current DFSchema implementation uses vector to operate with fields. It makes search of a column...

Add benchmark for DFSchema

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## Which issue does this PR close? Related to #7698. ## Rationale for this change To compare approaches of DFSchema optimization. ## What changes are included in this PR? Add...

Make space copyable

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I see no reasons for space to be non-copyable.