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[109.173.39.29]) by smtp.gmail.com with ESMTPSA id g5sm11425276ljn.101.2019.11.30.01.28.18 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 30 Nov 2019 01:28:18 -0800 (PST) From: Petr Fedorov Autocrypt: addr=petr.fedorov@phystech.edu; keydata= mQENBFemOXIBCADb1esaXYbV2DrN02akc5wgmGKtZVUdCbEma4OOAjCXz0uyk9mLpUUJwLtw Ad5Ur0V3HCxxUzeSSBJZdQzYMlhd8rWYgyCuEXTzMmnUelNd3TobEGlB6oLsBxccBw8zSgVd 0AfTUTGT8n5zfVOChmt5zLFUzGNjBHMocITXK7Wr4kSEA8D9Yp9C7+iPwT3Ni5eHzhmzXfEH R1zT9kagsLQO5wFt3EOzFJNOPKH8W7SqA5zWndgxH0QlZTmr6flEhsLc0WxfHEB8dluWSBQc w5WDXaM+l778IqYshLVDUcRxcPE6pzj27+2ugovidKfc7TbQhnQKG9by2czU6OV+jiYnABEB AAG0KFBldHIgRmVkb3JvdiA8cGV0ci5mZWRvcm92QHBoeXN0ZWNoLmVkdT6JATgEEwECACIF AlemOXICGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJECPVmdiEygE+5asIAISOfBgf oRgUVSRf2l1ZUoxJCamSBxtt6vTGdxJjotJlwF+Iyircpcx55rDAs1H6aq7zfU/TRBTLTVod PdStghINkkWtomZ1i8XnXnvIwdYvP4l3rfwnJ7fWJG9H0qbKMAWzDYaEF1r6Wcl6QeH4hXrk T/CXQPY98JTl8kdYnsKWoGkrIbwu14HlaOO7CWuI1iJVkeDYt3H9txT0oqnGukH/dyD8cIC0 zNdGIsmCWOKb4CduVRXKNwaZZ0061O4BVuz+Tf+McaYFI6KuIdi05JEVEk07zkpMZSKL2bTW B/CcdPpszesJ7tlsBHcrbGg4B4U/OZh7/0mLR5ySFuv1vpC5AQ0EV6Y5cgEIAKkkmIILFsu0 Qg14VvYhhq85pXKRE4byXdTgfUAheduZRB1RNTgo55/xQXapEHvFsqyCZJVS7sY3p0EKLSk1 tStuySxgumEEdXeXv99W6p34zpyh7sys76zW7RATjwZnlHYlQ0qSomZ4wj3DSv4e1x+9FitG NlqAvSN6XyHMLczVTHyaPfeedLh9Ghuvy9OeTrCeZ0mmDSiESaW8VojaIgpbGKQuBYsY61NH Fkgmb6jU+hDm0vV4l7Bn/0l756nt9nnt8VV7NNgvV63BVfyIHrJvm0yGQhXF86yWB7+XZx/F 0KLlZSoGpzFJfk6qSgLSnqFfI2OpXY7Vo49SsSyx7+UAEQEAAYkBHwQYAQIACQUCV6Y5cgIb DAAKCRAj1ZnYhMoBPueACAC9EHwB3a9UBHI8haKw3kGZbqOBthz1SLHCgFsw/jxGbWKC2cCa 9PL6ArCBvQelVOgkxfxN4gmQTFcwTD8AiTU3IffJxz8nFv/NRJptvUsPPhehmYGd2zp6D4O8 Gc/2JUgGcm0eNhhxqZAlSlzTAtHM23I4/yTiHgyiyawq7yQknLedgVkwsH+HTsHWYR0X4kg4 eErbPNj/B3+ZUAg9A6tRQOg9+B903gKsgtQacaTRSVA74kzaLNa4yevq97O0fBSSePCvX+Ti z7xx67iuIxa+yuZrzW2+itA6E5wLgfacBFkP8vZn4YrvA1MX0BP3iRCXxlNMr/D/rXgMKAya 6D03 To: pgsql-bugs@postgresql.org Subject: Since '2001-09-09 01:46:40'::timestamp microseconds are lost when extracting epoch Message-ID: <42b73d2d-da12-ba9f-570a-420e0cce19d9@phystech.edu> Date: Sat, 30 Nov 2019 12:28:18 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-Language: en-US List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Precedence: bulk Hello, Steps to reproduce: select extract(epoch from '2001-09-09 01:46:39.999999'::timestamp) returns 999999999.999999 as expected while select extract(epoch from '2001-09-09 01:46:40.000021'::timestamp) returns 1000000000.00002 - 1 microsecond is truncated. Obviously, it is due to the fact that extract epoch returns double precision which in turn has 15 decimal digits precision. While there is a pretty simple workaround in C, that returns microseconds since Unix epoch: Datum to_microseconds(PG_FUNCTION_ARGS) { =C2=A0Timestamp arg =3D PG_GETARG_TIMESTAMP(0)+946684800000000; =C2=A0 PG_RETURN_INT64(arg); } I was not able to find the other way of doing that (i.e. without C function).