Fixes to table inheritance

internal/endtoend/testdata/ddl_alter_table_inherits/postgresql/pgx/v4/query.sql

@@ -0,0 +1,15 @@
+-- name: GetAllParties :many
+SELECT * FROM party;
+
+-- name: GetAllPeople :many
+SELECT * FROM person;
+
+-- name: GetAllOrganisations :many
+SELECT * FROM organisation;
+
+-- name: GetOrganizationsByRegion :many
+SELECT *
+FROM organisation
+WHERE
+	region = 'us' AND
+	rank = 'ensign';

internal/endtoend/testdata/ddl_alter_table_inherits/postgresql/pgx/v4/schema.sql

@@ -0,0 +1,33 @@
+CREATE TYPE party_rank AS ENUM('ensign', 'lieutenant', 'commander');
+
+CREATE TABLE party (
+    party_id uuid PRIMARY KEY,
+    name text NOT NULL,
+    joined_on timestamptz NOT NULL,
+    ronk party_rank,
+    unnecessary_column text
+);
+
+CREATE TABLE person (
+    first_name text NOT NULL,
+    last_name text NOT NULL
+) INHERITS (party);
+
+CREATE TABLE organisation (
+    legal_name text
+) INHERITS (party);
+
+CREATE TABLE llc (
+   incorporation_date timestamp,
+   legal_name text NOT NULL
+) INHERITS (organisation);
+
+
+ALTER TABLE party ALTER COLUMN ronk SET NOT NULL; 
+ALTER TABLE party RENAME COLUMN ronk TO rank;
+ALTER TABLE party ALTER COLUMN joined_on DROP NOT NULL;
+ALTER TABLE party DROP COLUMN unnecessary_column;
+ALTER TABLE party ADD COLUMN region text;
+
+ALTER TYPE party_rank ADD VALUE 'captain';
+ALTER TYPE party_rank ADD VALUE 'admiral';

internal/endtoend/testdata/ddl_alter_table_inherits/postgresql/pgx/v4/sqlc.json

@@ -0,0 +1,13 @@
+{
+  "version": "1",
+  "packages": [
+    {
+      "path": "go",
+      "engine": "postgresql",
+      "sql_package": "pgx/v4",
+      "name": "querytest",
+      "schema": "schema.sql",
+      "queries": "query.sql"
+    }
+  ]
+}