you will see the output is series of SELECT pg_restore_relation_stats(...) and SELECT pg_restore_attribute_stats(...) calls. Exactly as we explained above.
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，这一点在新收录的资料中也有详细论述
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all the boolean operations on character sets become bitwise operations: intersection is AND, union is OR, complement is NOT. checking if a byte belongs to a set is a single bit test. checking if two sets are disjoint is AND followed by comparing to zero. these are all constant-time operations, and on AVX2 each one is a single instruction over the full 256 bits.