Add FieldConfig.consumingOverride for richer in-memory shape on realtime consuming segments#18406

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xiangfu0:worktree-realtime-segment-column-override

Commits on May 3, 2026

Add FieldConfig.consumingOverride for realtime mutable consuming segments

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Commits on May 4, 2026

Add ConsumingOverrideRealtimeTest end-to-end integration test

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Narrow consumingOverride allowlist to encodingType + indexTypes only

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Switch consumingOverride allowlist from indexTypes to indexes

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Address review findings: observability + stronger assertions + docs

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Address round-2 review: layering + observability + test strengthening

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Address round-3 review: NullNode normalization + state preservation + nits

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Address round-4 review: drop test-only setter calls + richer fallback log

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Commits on May 8, 2026

Fix ConsumingOverrideRealtimeTest in suite mode: use shared server starters

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