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Wed, 19 Aug 2026 01:25:22 +0000 Content-Type: multipart/mixed; boundary="===============0609356306510249408==" MIME-Version: 1.0 From: Richard Guo To: pgsql-committers@lists.postgresql.org Subject: pgsql: Reduce LEFT JOIN to ANTI JOIN using quals within the RHS subtree X-Auto-Response-Suppress: All Auto-Submitted: auto-generated Message-Id: Date: Wed, 19 Aug 2026 01:25:22 +0000 List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk --===============0609356306510249408== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 UmVkdWNlIExFRlQgSk9JTiB0byBBTlRJIEpPSU4gdXNpbmcgcXVhbHMgd2l0aGluIHRoZSBSSFMg c3VidHJlZQoKcmVkdWNlX291dGVyX2pvaW5zKCkgdHVybnMgYSBMRUZUIEpPSU4gaW50byBhbiBB TlRJIEpPSU4gd2hlbiBzb21lIFZhcgp0aGF0IGFuIHVwcGVyIHF1YWwgcmVxdWlyZXMgdG8gYmUg TlVMTCBpcyBhY3R1YWxseSBub24tbnVsbGFibGUgaW4gYW55Cm1hdGNoaW5nIHJvdy4gIFdoZW4g dGhhdCBob2xkcywgb25seSBudWxsLWV4dGVuZGVkICh1bm1hdGNoZWQpIHJvd3MKY2FuIHNhdGlz ZnkgdGhlIHVwcGVyIHF1YWwsIHdoaWNoIGlzIGV4YWN0bHkgYW50aS1qb2luIHNlbWFudGljcy4K VW50aWwgbm93IHdlIHJlY29nbml6ZWQgc3VjaCBhIFZhciBhcyBub24tbnVsbGFibGUgb25seSB3 aGVuIHRoZQpqb2luJ3Mgb3duIGNsYXVzZXMgd2VyZSBzdHJpY3QgZm9yIGl0LCBvciB3aGVuIGl0 IHdhcyBkZWZpbmVkIE5PVCBOVUxMCmJ5IHRhYmxlIGNvbnN0cmFpbnRzLgoKVGhpcyBwYXRjaCBh bGxvd3Mgc3RyaWN0IHF1YWxzIGFwcGxpZWQgd2l0aGluIHRoZSBSSFMgc3VidHJlZSB0byBzZXJ2 ZQphcyB0aGUgcHJvb2YgYXMgd2VsbC4gIEJlY2F1c2Ugc3VjaCBxdWFscyBob2xkIGZvciBldmVy eSByb3cgdGhlIFJIUwplbWl0cywgdGhleSBob2xkIGZvciBldmVyeSBtYXRjaGluZyByb3csIHNv IGEgVmFyIHRoZXkgZm9yY2Ugbm9uLW51bGwKY2FuIGJlY29tZSBOVUxMIGFib3ZlIHRoZSBqb2lu IG9ubHkgYnkgbnVsbC1leHRlbnNpb24uCgpUbyBhdm9pZCByZS13YWxraW5nIHRoZSBqb2ludHJl ZSBhdCBkZWNpc2lvbiB0aW1lLCB0aGUgZmlyc3QgcGFzcyBvZgp0aGUgcmVkdWNlLW91dGVyLWpv aW5zIHByb2Nlc3MgZ2F0aGVycyB0aGVzZSBwcm92aW5nIHF1YWxzIGludG8gaXRzCnBlci1zdWJ0 cmVlIHN0YXRlLCBhbG9uZ3NpZGUgbnVsbGFibGVfcmVscy4gIFRoZSBzZWNvbmQgcGFzcyB0aGVu CnByb3ZlcyBub24tbnVsbG5lc3MgZnJvbSB0aGUgUkhTIHN1YnRyZWUncyBjb2xsZWN0ZWQgcXVh bHMgdG9nZXRoZXIKd2l0aCB0aGUgam9pbidzIG93biBPTiBxdWFscy4gIEFzIGJlZm9yZSwgdGhl IHJlZHVjdGlvbiBmaXJlcyBvbmx5CndoZW4gdGhlIHByb3ZlbiwgZm9yY2VkLW51bGwgVmFyIGJl bG9uZ3MgdG8gdGhlIFJIUyBvZiB0aGUgam9pbi4KCkF1dGhvcjogUmljaGFyZCBHdW8gPGd1b2Zl bmdsaW51eEBnbWFpbC5jb20+ClJldmlld2VkLWJ5OiB3ZW5odWkgcWl1IDxxaXV3ZW5odWlmeEBn bWFpbC5jb20+CkRpc2N1c3Npb246IGh0dHBzOi8vcG9zdGdyLmVzL20vQ0FNYldzNDlIOWtoZisx R3d5ekQwVFlha3M2Y0UtT1UrMW1iVWlPbjNnWlNvQmlPN3pnQG1haWwuZ21haWwuY29tCgpCcmFu Y2gKLS0tLS0tCm1hc3RlcgoKRGV0YWlscwotLS0tLS0tCmh0dHBzOi8vZ2l0LnBvc3RncmVzcWwu b3JnL3BnL2NvbW1pdGRpZmYvYTgxMmNmNjQ3YTgyOGZjNjE1N2NhMWY4NjRmNzQwNjdmMDg4YjU4 MAoKTW9kaWZpZWQgRmlsZXMKLS0tLS0tLS0tLS0tLS0Kc3JjL2JhY2tlbmQvb3B0aW1pemVyL3By ZXAvcHJlcGpvaW50cmVlLmMgfCAgOTMgKysrKysrKysrKystLS0tCnNyYy90ZXN0L3JlZ3Jlc3Mv ZXhwZWN0ZWQvam9pbi5vdXQgICAgICAgIHwgMTg5ICsrKysrKysrKysrKysrKysrKysrKysrKysr KysrLQpzcmMvdGVzdC9yZWdyZXNzL3NxbC9qb2luLnNxbCAgICAgICAgICAgICB8ICA2MSArKysr KysrKystCjMgZmlsZXMgY2hhbmdlZCwgMzE5IGluc2VydGlvbnMoKyksIDI0IGRlbGV0aW9ucygt KQoK --===============0609356306510249408==--