Error pq: column d.adsrc does not exist

[gigaplus]

As of PostgreSQL V12
"Remove obsolete pg_attrdef.adsrc column (Peter Eisentraut)

This column has been deprecated for a long time, because it did not update in response to other catalog changes (such as column renamings). The recommended way to get a text version of a default-value expression from pg_attrdef is pg_get_expr(adbin, adrelid)."
https://www.postgresql.org/docs/12/release-12.html

Solution looks to be replace d.adsrc with pg_get_expr(d.adbin, d.adrelid) in /structs.go