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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 1
series_name obs_value time_period
FG384104005.Q 3.825831484374212 2017-12-31
FG384104005.Q 6.685299171442962 2018-03-31
FG384104005.Q 3.922904576231467 2018-06-30
FG384104005.Q 4.130042303121223 2018-09-30
FG384104005.Q 3.377391222747768 2018-12-31
FG384104005.Q 5.905098159371182 2019-03-31
FG384104005.Q 3.142025368753797 2019-06-30
FG154104005.Q 5.084259576315951 2017-12-31
FG154104005.Q 2.994283100284392 2018-03-31
FG154104005.Q 3.357940781533728 2018-06-30
FG154104005.Q 3.382807703277534 2018-09-30
FG154104005.Q 2.915212086558261 2018-12-31
FG154104005.Q 2.072911152729307 2019-03-31
FG154104005.Q 4.265474038700484 2019-06-30
FG153165105.Q 3.190052017480996 2017-12-31
FG153165105.Q 2.590072043418194 2018-03-31
FG153165105.Q 3.343399749580076 2018-06-30
FG153165105.Q 3.108870948819421 2018-09-30
FG153165105.Q 2.368108520717171 2018-12-31
FG153165105.Q 2.190939916139975 2019-03-31
FG153165105.Q 3.183395534476023 2019-06-30
FG153166000.Q 6.158260115598504 2017-12-31
FG153166000.Q 3.554759020656510 2018-03-31
FG153166000.Q 4.231760626750670 2018-06-30
FG153166000.Q 5.462344733253373 2018-09-30
FG153166000.Q 5.432498874027520 2018-12-31
FG153166000.Q 4.268915782478897 2019-03-31
FG153166000.Q 4.640293079973249 2019-06-30
FG144104005.Q 4.856960795039409 2017-12-31
FG144104005.Q 3.937026292209636 2018-03-31
FG144104005.Q 3.368250237127337 2018-06-30
FG144104005.Q 3.939649024335195 2018-09-30
FG144104005.Q 4.527273794666953 2018-12-31
FG144104005.Q 6.679776228429807 2019-03-31
FG144104005.Q 4.364320285758023 2019-06-30
FG104104005.Q 3.503452371709450 2017-12-31
FG104104005.Q 3.670254159879930 2018-03-31
FG104104005.Q 1.309016868338993 2018-06-30
FG104104005.Q 4.191176501703054 2018-09-30
FG104104005.Q 2.041634403281393 2018-12-31
FG104104005.Q 7.590014224313086 2019-03-31
FG104104005.Q 4.279407898561263 2019-06-30
FG314104005.Q 1.785825656428645 2017-12-31
FG314104005.Q 14.288117205171471 2018-03-31
FG314104005.Q 5.663750800146286 2018-06-30
FG314104005.Q 5.947833760197000 2018-09-30
FG314104005.Q 3.659446647972927 2018-12-31
FG314104005.Q 9.799654480658001 2019-03-31
FG314104005.Q 2.084444919189768 2019-06-30
FG214104005.Q 3.928584786168869 2017-12-31
FG214104005.Q -3.198453580216953 2018-03-31
FG214104005.Q -0.364751393518411 2018-06-30
FG214104005.Q -1.493354542386708 2018-09-30
FG214104005.Q -1.575085049703778 2018-12-31
FG214104005.Q -1.163191483206581 2019-03-31
FG214104005.Q -2.510471166127347 2019-06-30
FG794104005.Q 0.159348908897592 2017-12-31
FG794104005.Q 1.678531748037725 2018-03-31
FG794104005.Q 2.226028889034942 2018-06-30
FG794104005.Q 1.844495517503089 2018-09-30
FG794104005.Q 2.848153667727601 2018-12-31
FG794104005.Q 2.027952718415100 2019-03-31
FG794104005.Q 2.490888053624153 2019-06-30
FG264104005.Q 16.232882216382549 2017-12-31
FG264104005.Q 9.322037677591291 2018-03-31
FG264104005.Q 4.467988888014356 2018-06-30
FG264104005.Q 5.907598117735855 2018-09-30
FG264104005.Q -1.598513733891009 2018-12-31
FG264104005.Q -1.617225073562540 2019-03-31
FG264104005.Q 9.883975645208007 2019-06-30
SELECT 70