Improve UNION's output rowcount estimate

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ID 6919
Title Improve UNION's output rowcount estimate
CI (CFBot) Summary
Stats (from CFBot) Patch version: v2, Patch count: 1, First patch: +53−38, All patches: +53−38
Tags Performance
Created 2026-06-22 06:41:29
Last modified 2026-06-22 06:41:29 (1 hour ago)
Latest email 2026-06-22 04:38:39 (3 hours ago)
Status
PG20-1 (2026-07-01 – 2026-07-31): Needs review
Target version 20
Authors Richard Guo (richardguo)
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Improve UNION's output rowcount estimate
First at 2026-06-20 02:21:10 by Richard Guo <guofenglinux at gmail.com>
Latest at 2026-06-22 04:38:39 by David Rowley <dgrowleyml at gmail.com>
Latest attachment (v2-0001-Improve-UNION-s-output-row-count-estimate.patch) at 2026-06-22 02:59:30 from Richard Guo <guofenglinux at gmail.com>
    Attachment (v2-0001-Improve-UNION-s-output-row-count-estimate.patch) at 2026-06-22 02:59:30 from Richard Guo <guofenglinux at gmail.com> (Patch: Yes)
    Attachment (v1-0001-Improve-UNION-s-output-row-count-estimate.patch) at 2026-06-20 02:21:10 from Richard Guo <guofenglinux at gmail.com> (Patch: Yes)
History
When Who What
2026-06-22 06:41:29 Richard Guo (richardguo) Attached mail thread CAMbWs48Fu1nhGXPa60oc+adj7ge4dn0nHhqngqKvOVVQP61duA@mail.gmail.com
2026-06-22 06:41:29 Richard Guo (richardguo) Created patch record
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