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Gather each source column once per window and reuse it across aggregations, avoiding repeated Arrow takes and index allocations. Preserve aggregation semantics and output order without caching gathered windows. Signed-off-by: QuakeWang <wangfuzheng0814@foxmail.com>
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Purpose
Window joins already deduplicate row IDs before fetching payloads, but each aggregation rebuilds Arrow indices and gathers the same source column again.
Gather each source column once per window and reuse it across aggregations. Release gathered values after processing that window and column, preserving output order, empty/null behavior, output types, and mean precision and overflow handling.
Tests