bool attisdropped;
/*
- * Has a local definition (hence, do not drop when attinhcount is 0)
- * This is set and remains set if the column was _ever_
- * local/not-inherited, e.g. this can be set by ALTER TABLE NO INHERIT.
+ * This flag specifies whether this column has ever had a local
+ * definition. It is set for normal non-inherited columns, but also
+ * for columns that are inherited from parents if also explicitly listed
+ * in CREATE TABLE INHERITS. It is also set when inheritance is removed
+ * from a table with ALTER TABLE NO INHERIT. If the flag is set, the
+ * column is not dropped by a parent's DROP COLUMN even if this causes
+ * the column's attinhcount to become zero.
*/
bool attislocal;