Completando

WITH list(file) AS (SELECT * FROM pg_ls_dir('pg_multixact/offsets'))
SELECT EXISTS (SELECT * FROM list WHERE file = '0000') AND
       NOT EXISTS (SELECT * FROM list WHERE file = '0001') AND
       NOT EXISTS (SELECT * FROM list WHERE file = 'FFFF') AND
       EXISTS (SELECT * FROM list WHERE file != '0000')
       AS file_0000_removal_required;

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