Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kb29w-0001aK-DY for pgsql-hackers@arkaria.postgresql.org; Fri, 06 Nov 2020 13:52:08 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.92) (envelope-from ) id 1kb29v-0007Sa-By for pgsql-hackers@arkaria.postgresql.org; Fri, 06 Nov 2020 13:52:07 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kb29v-0007ST-5P for pgsql-hackers@lists.postgresql.org; Fri, 06 Nov 2020 13:52:07 +0000 Received: from mahout.postgresql.org ([2001:4800:3e1:1::227]) by magus.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kb29t-0001Qo-BM for pgsql-hackers@lists.postgresql.org; Fri, 06 Nov 2020 13:52:06 +0000 Received: from coridan.postgresql.org ([2001:4800:3e1:1::213]) by mahout.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kb29r-0003lQ-Me for pgsql-hackers@lists.postgresql.org; Fri, 06 Nov 2020 13:52:03 +0000 Received: from localhost ([127.0.0.1] helo=coridan.postgresql.org) by coridan.postgresql.org with esmtp (Exim 4.92) (envelope-from ) id 1kb29q-00072C-J6 for pgsql-hackers@lists.postgresql.org; Fri, 06 Nov 2020 13:52:02 +0000 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Subject: Re: bitmaps and correlation To: pgsql-hackers@lists.postgresql.org From: Anastasia Lubennikova Cc: Justin Pryzby Date: Fri, 06 Nov 2020 13:51:26 +0000 User-Agent: pgcommitfest X-cfsender: lubennikovaav In-Reply-To: <20200313140916.GP29065@telsasoft.com> References: <20190101225615.GF25379@telsasoft.com> <20200313140916.GP29065@telsasoft.com> Message-ID: <160467068611.7362.8226463259534237605.pgcf@coridan.postgresql.org> List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Precedence: bulk U3RhdHVzIHVwZGF0ZSBmb3IgYSBjb21taXRmZXN0IGVudHJ5DQoNCkFjY29yZGluZyB0byBjZmJv dCwgdGhlIHBhdGNoIGZhaWxzIHRvIGFwcGx5LiAgQ291bGQgeW91IHBsZWFzZSBzZW5kIGEgcmVi YXNlZCB2ZXJzaW9uPw0KDQpJIHdvbmRlciB3aHkgdGhpcyBwYXRjaCBoYW5ncyBzbyBsb25nIHdp dGhvdXQgYSByZXZpZXcuIE1heWJlIGl0IHdpbGwgaGVscCB0byBtb3ZlIGRpc2N1c3Npb24gZm9y d2FyZCwgaWYgeW91IHByb3ZpZGUgbW9yZSBleGFtcGxlcyBvZiBxdWVyaWVzIHRoYXQgY2FuIGJl bmVmaXQgZnJvbSB0aGlzIGltcG9yb3ZlbWVudD8NCg0KVGhlIGZpcnN0IHBhdGNoIGlzIHNpbXBs eSBhIHJlZmFjdG9yaW5nIGFuZCBkb24ndCBzZWUgYW55IHBvc3NpYmxlIG9iamVjdGlvbnMgYWdh aW5zdCBpdC4NClRoZSBzZWNvbmQgcGF0Y2ggYWxzbyBsb29rcyBmaW5lIHRvIG1lLiBUaGUgbG9n aWMgaXMgdW5kZXJzdGFuZGFibGUgYW5kIHRoZSBjb2RlIGlzIG5lYXQuDQoNCkl0IHdvdWxkbid0 IGh1cnQgdG8gYWRkIGEgY29tbWVudCBmb3IgdGhpcyBjb21wdXRhdGlvbiwgdGhvdWdoLg0KKwlw YWdlc19mZXRjaGVkID0gcGFnZXNfZmV0Y2hlZE1BWCArIGluZGV4Q29ycmVsYXRpb24qaW5kZXhD b3JyZWxhdGlvbioocGFnZXNfZmV0Y2hlZE1JTiAtIHBhZ2VzX2ZldGNoZWRNQVgpOwoKVGhlIG5l dyBzdGF0dXMgb2YgdGhpcyBwYXRjaCBpczogV2FpdGluZyBvbiBBdXRob3IK