Port catalog tests (#672)

* Regenerate testdata via go instead of bash

* postgresql: Port catalog tests to end-to-end tests

* endtoend: Fix whitespace issues with new queries

Author: kyleconroy

Makefile

@@ -11,4 +11,4 @@ sqlc-pg-gen:
 	go build -o ~/bin/sqlc-pg-gen ./internal/tools/sqlc-pg-gen
 
 regen: sqlc-dev
-	./scripts/regenerate.sh
+	go run ./scripts/regenerate/

internal/endtoend/testdata/ddl_alter_table_column_drop_not_null/postgresql/go/db.go

@@ -0,0 +1,2 @@
+-- name: Placeholder :exec
+SELECT 1;

internal/endtoend/testdata/ddl_alter_table_column_drop_not_null/postgresql/go/models.go

@@ -0,0 +1,2 @@
+CREATE TABLE foo (bar text NOT NULL);
+ALTER TABLE foo ALTER COLUMN bar DROP NOT NULL;

internal/endtoend/testdata/ddl_alter_table_column_drop_not_null/postgresql/go/query.sql.go

@@ -0,0 +1,12 @@
+{
+  "version": "1",
+  "packages": [
+    {
+      "path": "go",
+      "engine": "postgresql",
+      "name": "querytest",
+      "schema": "schema.sql",
+      "queries": "query.sql"
+    }
+  ]
+}