Fix bucket-merge scheduling and ReadFromCluster filter staleness - #2302

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VighneshPath:fix/antalya-26.6/query-plan-aggregation-perf

Commits on Sep 2, 2026

Merge two-level aggregation buckets largest-first to cut merge tail latency

VighneshPath
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claude
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4fa22fd
Defer ReadFromCluster's task/file list to initializePipeline

VighneshPath
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claude
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79f6ee1
Fix gtest_read_from_cluster_predicate_pushdown compile errors

VighneshPath
and
claude
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5671621