Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1vwl2Y-00B6ye-01 for pgsql-committers@arkaria.postgresql.org; Sun, 01 Mar 2026 17:57:14 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.96) (envelope-from ) id 1vwl2V-00DzYM-0h for pgsql-committers@arkaria.postgresql.org; Sun, 01 Mar 2026 17:57:11 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1vwl2U-00DzYD-3D for pgsql-committers@lists.postgresql.org; Sun, 01 Mar 2026 17:57:10 +0000 Received: from mahout.postgresql.org ([2001:4800:3e1:1::227]) by magus.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1vwl2P-00000001u5u-3omR for pgsql-committers@lists.postgresql.org; Sun, 01 Mar 2026 17:57:10 +0000 Received: from gemulon.postgresql.org ([2001:4800:3e1:1::198]) by mahout.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1vwl2N-005QuE-2I for pgsql-committers@lists.postgresql.org; Sun, 01 Mar 2026 17:57:03 +0000 Received: from localhost ([127.0.0.1] helo=gemulon.postgresql.org) by gemulon.postgresql.org with esmtp (Exim 4.96) (envelope-from ) id 1vwl2L-001nu0-2u for pgsql-committers@lists.postgresql.org; Sun, 01 Mar 2026 17:57:01 +0000 Content-Type: multipart/mixed; boundary="===============8764803611781698876==" MIME-Version: 1.0 From: Tom Lane To: pgsql-committers@lists.postgresql.org Subject: pgsql: Correctly calculate "MCV frequency" for a unique column. X-Auto-Response-Suppress: All Auto-Submitted: auto-generated Message-Id: Date: Sun, 01 Mar 2026 17:57:01 +0000 List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk --===============8764803611781698876== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Q29ycmVjdGx5IGNhbGN1bGF0ZSAiTUNWIGZyZXF1ZW5jeSIgZm9yIGEgdW5pcXVlIGNvbHVtbi4K CkluIGNvbW1pdCBiZDNlM2U5ZTUsIEkgb3Zlci1oYXN0aWx5IHVzZWQgMSAvIHJlbC0+cm93cyBh cyB0aGUgYXNzdW1lZApmcmVxdWVuY3kgb2YgZW50cmllcyBpbiBhIGNvbHVtbiB0aGF0IEFOQUxZ WkUgaGFzIGZvdW5kIHRvIGJlIHVuaXF1ZS4KSG93ZXZlciwgcmVsLT5yb3dzIGlzIHRoZSBudW1i ZXIgb2YgdGFibGUgcm93cyB0aGF0IGFyZSBlc3RpbWF0ZWQgdG8KcGFzcyB0aGUgcXVlcnkncyBy ZXN0cmljdGlvbiBjb25kaXRpb25zLCBzbyB0aGF0IHdlIGdvdCBhIHRvby1sYXJnZQpyZXN1bHQg aWYgdGhlIHF1ZXJ5IGhhcyBzZWxlY3RpdmUgcmVzdHJpY3Rpb25zLiAgV2hhdCBJIHNob3VsZCBo YXZlCnVzZWQgaXMgMSAvIHJlbC0+dHVwbGVzLCBzaW5jZSB0aGF0IGlzIHRoZSBlc3RpbWF0ZWQg dG90YWwgbnVtYmVyIG9mCnRhYmxlIHJvd3MuICBUaGUgcHJlLWV4aXN0aW5nIGNvZGUgcGF0aCB0 aGF0IGRpZ3MgYSBmcmVxdWVuY3kgb3V0IG9mCnRoZSBoaXN0b2dyYW0gcHJvZHVjZXMgYSBmcmVx dWVuY3kgcmVsYXRpdmUgdG8gdGhlIHdob2xlIHRhYmxlLCBzbwpzdXJlbHkgdGhpcyBuZXcgYWx0 ZXJuYXRpdmUgY29kZSBwYXRoIG11c3QgZG8gc28gYXMgd2VsbC4gIEFueQpjb3JyZWN0aW9uIG5l ZWRlZCBvbiB0aGUgYmFzaXMgb2Ygc2VsZWN0aXZpdHkgbXVzdCBiZSBkb25lIGJ5IHRoZQp1c2Vy IG9mIHRoZSBtY3ZfZnJlcSB2YWx1ZS4KCkZpeGluZyB0aGlzIGNhdXNlcyBhbGwgdGhlIHJlZ3Jl c3Npb24gdGVzdCBwbGFucyBjaGFuZ2VkIGJ5IGJkM2UzZTllNQp0byByZXZlcnQgdG8gd2hhdCB0 aGV5IGhhZCBiZWVuLCBleGNlcHQgZm9yIHRoZSBmaXJzdCBjaGFuZ2UgaW4Kam9pbi5vdXQuICBB cyBJIGNvcnJlY3RseSBhcmd1ZWQgaW4gYmQzZTNlOWU1LCBpbiB0aGF0IHRlc3QgY2FzZSB3ZQpo YXZlIG5vIHN0YXRzIGFuZCBzaG91bGQgbm90IHJpc2sgYSBoYXNoIGpvaW4uICBFdmlkZW50bHkg SSB3YXMgbGVzcwpjb3JyZWN0IHRvIGFyZ3VlIHRoYXQgdGhlIG90aGVyIGNoYW5nZXMgd2VyZSBp bXByb3ZlbWVudHMuCgpSZXBvcnRlZC1ieTogSm9lbCBKYWNvYnNvbiA8am9lbEBjb21waWxlci5v cmc+CkRpYWdub3NlZC1ieTogVGVuZGVyIFdhbmcgPHRuZHJ3YW5nQGdtYWlsLmNvbT4KQXV0aG9y OiBUb20gTGFuZSA8dGdsQHNzcy5wZ2gucGEudXM+CkRpc2N1c3Npb246IGh0dHBzOi8vcG9zdGdy LmVzL20vMzQxYjcyM2MtZGE0NS00MDU4LTk0NDYtMTUxNGRlZGIxN2MxQGFwcC5mYXN0bWFpbC5j b20KCkJyYW5jaAotLS0tLS0KbWFzdGVyCgpEZXRhaWxzCi0tLS0tLS0KaHR0cHM6Ly9naXQucG9z dGdyZXNxbC5vcmcvcGcvY29tbWl0ZGlmZi9kODBiMDIyNTAxMGZkNDA3Yzc4NGJiZWNkZTExNmEy ODE5OGI2ZWFiCgpNb2RpZmllZCBGaWxlcwotLS0tLS0tLS0tLS0tLQpzcmMvYmFja2VuZC91dGls cy9hZHQvc2VsZnVuY3MuYyAgICAgICAgICAgICB8ICAgOSArLQpzcmMvdGVzdC9yZWdyZXNzL2V4 cGVjdGVkL2pvaW4ub3V0ICAgICAgICAgICB8ICAxNiArLQpzcmMvdGVzdC9yZWdyZXNzL2V4cGVj dGVkL3BhcnRpdGlvbl9qb2luLm91dCB8IDQzMiArKysrKysrKysrKysrKy0tLS0tLS0tLS0tLS0K MyBmaWxlcyBjaGFuZ2VkLCAyMzEgaW5zZXJ0aW9ucygrKSwgMjI2IGRlbGV0aW9ucygtKQoK --===============8764803611781698876==--