erigontech / erigontech/erigon
commitment: fold — encode whole row at once, avoid merge with previous branchData
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tech debt reduction
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Description
Subtask of #20475.
Encode complete `BranchData` (full `afterMap`) in `foldBranch()` instead of partial data requiring a merge step on the read path. Eliminates `BranchMerger` from the fold→encode→write hot path.
Implemented in #20548.
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