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Help with an interesting Postgres question: Why isn't an Index Only Scan used on a partition accessed via the parent table?.
CREATE TABLE
INSERT 0 1000
CREATE TABLE
INSERT 0 100000
CREATE INDEX
CREATE TYPE
user_id log_date payload
991 2014-12-03 781
992 2015-01-05 406
993 2014-12-25 241
994 2014-12-29 240
995 2015-01-07 225
996 2014-12-27 171
997 2014-11-17 231
998 2015-01-05 822
999 2014-12-19 333
1000 2014-12-26 190
SELECT 10
user_id log_date payload
991 2014-12-03 781
992 2015-01-05 406
993 2014-12-25 241
994 2014-12-29 240
995 2015-01-07 225
996 2014-12-27 171
997 2014-11-17 231
998 2015-01-05 822
999 2014-12-19 333
1000 2014-12-26 190
SELECT 10
user_id log_date payload
991 2014-12-03 781
992 2015-01-05 406
993 2014-12-25 241
994 2014-12-29 240
995 2015-01-07 225
996 2014-12-27 171
997 2014-11-17 231
998 2015-01-05 822
999 2014-12-19 333
1000 2014-12-26 190
SELECT 10
user_id log_date payload
991 2014-12-03 781
992 2015-01-05 406
993 2014-12-25 241
994 2014-12-29 240
995 2015-01-07 225
996 2014-12-27 171
997 2014-11-17 231
998 2015-01-05 822
999 2014-12-19 333
1000 2014-12-26 190
SELECT 10