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pg_attribute_encoding

The pg_attribute_encoding system catalog table contains column storage information.

Table 1. pg_catalog.pg_attribute_encoding
column	type	modifers	storage	description
`attrelid`	oid	not null	plain	Foreign key to `pg_attribute.attrelid`
`attnum`	smallint	not null	plain	Foreign key to `pg_attribute.attnum`
`attoptions`	text [ ]		extended	The options