Add exact reverse scan support to PushdownSort with limit-after-reverse fix#52

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zhuqi-lucas wants to merge 10 commits intobranch-52from

exact-reverse-scan

Commits on Apr 15, 2026

Add exact reverse scan with per-RG buffering and tests
zhuqi-lucas
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Add session config, limit-after-reverse fix, SLT tests, and plan display for exact reverse scan
zhuqi-lucas
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Fix proto deserialization: add enable_exact_reverse_scan default
zhuqi-lucas
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Commits on Apr 16, 2026

Fix row_selection bug in exact reverse scan + add comprehensive tests
zhuqi-lucas
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Commits on Apr 17, 2026