feat(exporter): unified Arrow exporter with GUC + end-to-end TAP test#116

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unified_arrow_exporter

Commits on Jun 18, 2026

feat(exporter): add OTelArrowExporter implementing StatsExporter end-to-end

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claude
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feat(exporter): add use_unified_arrow_exporter GUC + dispatcher wiring

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claude
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test: end-to-end round-trip of the unified Arrow exporter into events_raw

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fix(exporter): address Cursor + Copilot review nits

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claude
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fix(guc): make use_unified_arrow_exporter PGC_POSTMASTER

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feat(exporter): mid-batch flush at row boundary against psch_otel_max_block_bytes

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claude
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