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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 12.8 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 8.4.1 20200928 (Red Hat 8.4.1-1), 64-bit 
1 rows affected

1 rows affected
len_bytes b_start id bytes
12 0 1 \x000200780003007800040078
12 4 1 \x000200780003007800040078
12 8 1 \x000200780003007800040078
8 0 2 \x000604c4000704c4
8 4 2 \x000604c4000704c4
byte_1 byte_2 byte_3 byte_4 b_start as_string id bytes
0 2 0 78 0 000200780003007800040078 1 \x000200780003007800040078
0 3 0 78 4 000200780003007800040078 1 \x000200780003007800040078
0 4 0 78 8 000200780003007800040078 1 \x000200780003007800040078
0 6 4 c4 0 000604c4000704c4 2 \x000604c4000704c4
0 7 4 c4 4 000604c4000704c4 2 \x000604c4000704c4