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Sat, 20 Sep 2025 16:09:03 +0000 Content-Type: multipart/mixed; boundary="===============2123757853984899463==" MIME-Version: 1.0 Subject: BUG #19059: PostgreSQL fails to evaluate the cheaper expression first, leading to 45X performance degradation To: pgsql-bugs@lists.postgresql.org From: PG Bug reporting form Cc: jinhui.lai@qq.com Reply-To: jinhui.lai@qq.com, pgsql-bugs@lists.postgresql.org Date: Sat, 20 Sep 2025 16:08:11 +0000 Message-ID: <19059-c751eed385314309@postgresql.org> X-Auto-Response-Suppress: All Auto-Submitted: auto-generated List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk --===============2123757853984899463== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 VGhlIGZvbGxvd2luZyBidWcgaGFzIGJlZW4gbG9nZ2VkIG9uIHRoZSB3ZWJzaXRlOgoKQnVnIHJl ZmVyZW5jZTogICAgICAxOTA1OQpMb2dnZWQgYnk6ICAgICAgICAgIEppbmh1aSBMYWkKRW1haWwg YWRkcmVzczogICAgICBqaW5odWkubGFpQHFxLmNvbQpQb3N0Z3JlU1FMIHZlcnNpb246IDE3LjYK T3BlcmF0aW5nIHN5c3RlbTogICB1YnVudHUgMjIuMDQKRGVzY3JpcHRpb246ICAgICAgICAKCkRl YXIgUEcgZGV2ZWxvcGVycywKClRoYW5rcyBmb3IgcmVhZGluZyBteSByZXBvcnQuIFlvdSBjYW4g cmVwcm9kdWNlIGl0IGFzIGZvbGxvd3MsIHBsZWFzZS4KClBHIGhhcyBhcHBsaWVkIHNob3J0LWNp cmN1aXQgZXZhbHVhdGlvbiBmb3IgdGhlIGZvbGxvd2luZyBxdWVyaWVzLCB3aGljaApjb250YWlu IGFuIE9SIGV4cHJlc3Npb24gaW4gdGhlaXIgV0hFUkUgY2xhdXNlLiBXaGVuICJ0MC5jMCA+IDAi IGlzIHRydWUsIFBHCndpbGwgc2tpcCB0byBldmFsdWF0ZSAiRVhJU1RTIChTRUxFQ1QgMSBGUk9N IHQxIFdIRVJFIHQxLmMxID0gdDAuYzApIiwKc2luY2UgdHJ1ZSBhbmQgYW55IGJvb2xlYW4gZXhw cmVzc2lvbiBpcyB0cnVlLgoKSG93ZXZlciwgdGhlIG9wdGltaXplciBmYWlscyB0byByZW9yZGVy IHRoZSBleHByZXNzaW9ucyBpbiB0aGUgV0hFUkUgY2xhdXNlCmZvciB0aGUgc2Vjb25kIHF1ZXJ5 LiBZb3UgY2FuIG9ic2VydmUgdGhpcyBmcm9tIHRoZSBzZWNvbmQgcm93IGluIHRoZSBwbGFuOgoi RmlsdGVyOiAoRVhJU1RTKFN1YlBsYW4gMSkgT1IgKGMwID4gMCkpIgpBIG1vcmUgb3B0aW1hbCBz dHJhdGVneSB3b3VsZCBiZSBmb3IgUEcgdG8gdXNlIGl0cyBjb3N0IG1vZGVsIHRvIHJlb3JkZXIK ZXhwcmVzc2lvbnMsIHByaW9yaXRpemluZyB0aGUgZXZhbHVhdGlvbiBvZiBsZXNzIGV4cGVuc2l2 ZSBvcGVyYXRpb25zIGZpcnN0LgoKCkNSRUFURSBUQUJMRSB0MChjMCBJTlQ4KTsKSU5TRVJUIElO VE8gdDEgVkFMVUVTKDEpOwpDUkVBVEUgVEFCTEUgdDEoYzEgSU5UOCk7CklOU0VSVCBJTlRPIHQx IFNFTEVDVCAqIEZST00gZ2VuZXJhdGVfc2VyaWVzKDEsIDEwMDAwMDApOwoKU0VMRUNUIHQwLmMw IEZST00gdDAgV0hFUkUgIHQwLmMwID4gMCBPUiBFWElTVFMgKFNFTEVDVCAxIEZST00gdDEgV0hF UkUKdDEuYzEgPSB0MC5jMCk7ClRpbWU6IDEzOS40MTYgbXMKClNFTEVDVCB0MC5jMCBGUk9NIHQw IFdIRVJFIEVYSVNUUyAoU0VMRUNUIDEgRlJPTSB0MSBXSEVSRSB0MS5jMSA9IHQwLmMwKSBPUgp0 MC5jMCA+IDA7ClRpbWU6IDYyMjEuODg2IG1zICgwMDowNi4yMjIpCgpleHBsYWluIFNFTEVDVCB0 MC5jMCBGUk9NIHQwIFdIRVJFIEVYSVNUUyAoU0VMRUNUIDEgRlJPTSB0MSBXSEVSRSB0MS5jMSA9 CnQwLmMwKSBPUiB0MC5jMCA+IDA7CiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICBR VUVSWSBQTEFOCi0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0t LS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0KIFNlcSBTY2FuIG9uIHQwICAoY29zdD0w LjAwLi44OTMzMDYwMDEuMjUgcm93cz0xNzAwIHdpZHRoPTQpCiAgIEZpbHRlcjogKEVYSVNUUyhT dWJQbGFuIDEpIE9SIChjMCA+IDApKQogICBTdWJQbGFuIDEKICAgICAtPiAgU2VxIFNjYW4gb24g dDEgIChjb3N0PTAuMDAuLjM1MDMxNi4wNiByb3dzPTEgd2lkdGg9MCkKICAgICAgICAgICBGaWx0 ZXI6IChjMSA9IHQwLmMwKQogSklUOgogICBGdW5jdGlvbnM6IDcKICAgT3B0aW9uczogSW5saW5p bmcgdHJ1ZSwgT3B0aW1pemF0aW9uIHRydWUsIEV4cHJlc3Npb25zIHRydWUsIERlZm9ybWluZwp0 cnVlCgpUaGFua3MgeW91IG9uY2UgYWdhaW4uIEkgbG9vayBmb3J3YXJkIHRvIHlvdXIgcmVwbHku CkJlc3QgcmVnYXJkLApKaW5odWkKCg== --===============2123757853984899463==--