Обсуждение: relation between records in "main" and "toast" tables

Hello,
Let's say TableA has "toastable" column, the contents of this column is
stored in let's say pg_toast_1234.
Is there a query to find which records (chunk_id, chunk_seq) in
pg_toast_1234 store data for specific record in TableA (i.e. with PK
column value eq. '567')?
Igor Neyman