feat: add end-to-end tests for emitting pointers for nullable types in MySQL code generation

Author: yoRyuuuuu

internal/endtoend/testdata/emit_pointers_for_null_types/mysql/go/db.go

@@ -0,0 +1,2 @@
+-- name: Test :one
+SELECT 1;

internal/endtoend/testdata/emit_pointers_for_null_types/mysql/go/models.go

@@ -0,0 +1,17 @@
+CREATE TABLE dt_integer (
+    a tinyint,
+    b smallint,
+    c int,
+    d integer,
+    e mediumint,
+    f bigint
+);
+
+CREATE TABLE dt_unsigned_integer (
+    a tinyint unsigned,
+    b smallint unsigned,
+    c int unsigned,
+    d integer unsigned,
+    e mediumint unsigned,
+    f bigint unsigned
+);

internal/endtoend/testdata/emit_pointers_for_null_types/mysql/go/query.sql.go

@@ -0,0 +1,13 @@
+{
+  "version": "1",
+  "packages": [
+    {
+      "path": "go",
+      "engine": "mysql",
+      "name": "datatype",
+      "schema": "sql/",
+      "queries": "sql/",
+      "emit_pointers_for_null_types": true
+    }
+  ]
+}