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Share table metadata across rows in each chunk - #272
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Each routed row held its own references to shared table metadata and looked up its encoder by table key. This repeated reference counting and hashing for every row. Store metadata in each chunk and let rows refer to it by index. Look up encoders once per chunk entry. Reuse table lookups during bootstrap and WAL replay, and share deferred replay's memory permit across chunks.
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Each routed row held its own references to shared table metadata and
looked up its encoder by table key. This repeated reference counting
and hashing for every row.
Store metadata in each chunk and let rows refer to it by index. Look
up encoders once per chunk entry. Reuse table lookups during bootstrap
and WAL replay, and share deferred replay's memory permit across chunks.