Fix ALTER TYPE to update column types (#973)

* fixed alter type to update column types

* tests for alter type with update table columns

* make for loop more readable

internal/endtoend/testdata/ddl_alter_type_rename_and_update_columns/postgresql/query.sql

@@ -0,0 +1,11 @@
+CREATE TYPE event AS enum ('START', 'STOP');
+
+CREATE TABLE log_lines (
+  id     BIGSERIAL    PRIMARY KEY,
+  status "event"  NOT NULL
+);
+
+ALTER TYPE event RENAME TO "new_event";
+
+-- name: ListAuthors :many
+SELECT * FROM log_lines;

internal/endtoend/testdata/ddl_alter_type_rename_and_update_columns/postgresql/sqlc.json

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

internal/sql/catalog/types.go

@@ -207,5 +207,16 @@ func (c *Catalog) renameType(stmt *ast.RenameTypeStmt) error {
 
 	}
 
+	// Update all the table columns with the new type
+	for _, schema := range c.Schemas {
+		for _, table := range schema.Tables {
+			for _, column := range table.Columns {
+				if column.Type == *stmt.Type {
+					column.Type.Name = newName
+				}
+			}
+		}
+	}
+
 	return nil
 }