55.8. pg_attrmask

55.8. `pg_attrmask`
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55.8. `pg_attrmask`

The catalog pg_attrmask stores column masking expressions. The main information about columns is stored in pg_attribute. Only columns for which a masking expression has been explicitly set will have an entry here.

Table 55.8. pg_attrmask Columns

Column Type Description
`oid` `oid` Row identifier
`amrelid` `oid` (references `pg_class`.`oid`) The table this expression belongs to
`amnum` `int2` (references `pg_attribute`.`attnum`) The number of the column
`ambin` `pg_node_tree` The column masking expression value, in `nodeToString()` representation. Use `pg_get_expr(ambin, amrelid)` to convert it to an SQL expression.

Column Type

Description

oid oid

Row identifier

amrelid oid (references pg_class.oid)

The table this expression belongs to

amnum int2 (references pg_attribute.attnum)

The number of the column

ambin pg_node_tree

The column masking expression value, in nodeToString() representation. Use pg_get_expr(ambin, amrelid) to convert it to an SQL expression.

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