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From: SCHOEMANS Maxime <maxime.schoemans@ulb.be>
To: Haibo Yan <tristan.yim@gmail.com>
CC: vignesh C <vignesh21@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>, Damir
 Belyalov <dam.bel07@gmail.com>, jian he <jian.universality@gmail.com>,
	PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>, SAKR Mahmoud
	<mahmoud.sakr@ulb.be>, Diogo Repas <diogo.repas@gmail.com>, Andrey Lepikhov
	<a.lepikhov@postgrespro.ru>
Subject: Re: Implement missing join selectivity estimation for range types
Thread-Topic: Implement missing join selectivity estimation for range types
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Date: Thu, 16 Apr 2026 15:12:56 +0000
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Hi Haibo,

Attached is v7 with the changes we discussed.

Patch 2 now has an inline comment on the && case explaining the
outer-bounds approximation and its consistency with existing restriction
selectivity. The commit message mentions it as well.

Patch 3 uses a separate backend-private header (rangetypes_selfuncs.h)
instead of selfuncs.h.

Regards,
Maxime

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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
<style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo=
ttom:0;} </style>
</head>
<body dir=3D"ltr">
<span style=3D"font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService,=
 Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Hi =
Haibo,</span>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
Attached is v7 with the changes we discussed.</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
Patch 2 now has an inline comment on the &amp;&amp; case explaining the</di=
v>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
outer-bounds approximation and its consistency with existing restriction</d=
iv>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
selectivity. The commit message mentions it as well.</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
Patch 3 uses a separate backend-private header (rangetypes_selfuncs.h)</div=
>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
instead of selfuncs.h.</div>
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Regards,</div>
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nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
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 v7-0003-Remove-duplicate-selectivity-functions-between-ra.patch
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