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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?.
version
PostgreSQL 11.17 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-10), 64-bit
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CREATE TABLE
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id created_at updated_at academy_year_id assessment form_id section_id subject_id term_id
632b53ee-1a4d-49bb-93d3-8a1d74bbc916 2019-09-12 22:13:33.984 2019-09-12 22:13:33.984 3 [{"exam": 60.0, "grade": "A", "total": 50.0, "position": "First", "student_id": "f3df0bc2-7b4c-49b9-86c9-6e6b01628623", "assessment_2": 17.0, "assessment_3": 5.0, "student_name": "Anana Aristotle", ",assessment_1": 9.0, "result_computed": false, "subject_teacher_done": false}, {"exam": 50.0, "grade": "B", "total": 49.0, "position": "Third", "student_id": "3a2e5f48-a945-4594-b56e-367d4af52dc0", "assessment_1": 9.0, "assessment_2": 17.0, "assessment_3": 5.0, "student_name": "Anana Elvis", "result_computed": false, "subject_teacher_done": false}] 2 4 3 1
72dd61d7-24ef-4708-b78a-b5e824d8f959 2019-09-12 22:13:49.758 2019-09-12 22:13:49.758 3 [{"exam": 29.5, "grade": "n", "total": 50.0, "position": "First", "student_id": "f3df0bc2-7b4c-49b9-86c9-6e6b01628623", "assessment_1": 9.0, "assessment_2": 17.0, "assessment_3": 5.0, "student_name": "Anana Aristotle", "result_computed": false, "subject_teacher_done": false}, {"exam": 50.0, "grade": "B", "total": 69.0, "position": "Third", "student_id": "3a2e5f48-a945-4594-b56e-367d4af52dc0", "assessment_1": 9.0, "assessment_2": 17.0, "assessment_3": 5.0, "student_name": "Anana Elvis", "result_computed": false, "subject_teacher_done": false}] 2 4 2 1
e41cbacf-c16f-49eb-a95d-4d86e8b894d6 2019-09-21 01:13:28.406 2019-09-21 01:13:28.406 3 [{"exam": 40, "grade": "A", "total": 50, "position": "First", "student_id": "f3df0bc2-7b4c-49b9-86c9-6e6b01628623", "assessment_1": 9, "assessment_2": 17, "assessment_3": 5, "student_name": "Anana Aristotle", "result_computed": 0, "subject_teacher_done": 0}, {"exam": 50, "grade": "B", "total": 69, "position": "Third", "student_id": "3a2e5f48-a945-4594-b56e-367d4af52dc0", "assessment_1": 9, "assessment_2": 17, "assessment_3": 5, "student_name": "Anana Elvis", "result_computed": 0, "subject_teacher_done": 0}] 2 4 5 1
7c03c648-556d-447e-8eca-8cf79d993513 2019-09-12 22:13:03.421 2019-09-12 22:13:03.421 3 [{"exam": 42.5, "grade": "B", "total": 73.5, "position": "First", "student_id": "f3df0bc2-7b4c-49b9-86c9-6e6b01628623", "assessment_1": 9.0, "assessment_2": 17.0, "assessment_3": 5.0, "student_name": "Anana Aristotle", "result_computed": false, "subject_teacher_done": false}, {"exam": 40.5, "grade": "n", "total": 71.5, "position": "Third", "student_id": "3a2e5f48-a945-4594-b56e-367d4af52dc0", "assessment_1": 9.0, "assessment_2": 17.0, "assessment_3": 5.0, "student_name": "Anana Elvis", "result_computed": false, "subject_teacher_done": false}] 2 4 4 1
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