Rft: remove defaultRegistry

Users should make the decision that if use "global regitry". If they want, they should define their own global registry.

.CHANGELOG.md

@@ -5,6 +5,7 @@
 - [Updater Definition](https://github.com/gotomicro/eql/pull/8)
 - [Metadata API](https://github.com/gotomicro/eql/pull/16)
 - [tagMetaRegistry: default implementation of MetaRegistry](https://github.com/gotomicro/eql/pull/25)
+- [Rft: remove defaultRegistry](https://github.com/gotomicro/eql/pull/46)
 - [Use `bytebufferpool` for builder](https://github.com/gotomicro/eql/pull/39)
 - [Refactor: move Insert function into db.file](https://github.com/gotomicro/eql/pull/28)
 - [Selector implementation, excluding WHERE and HAVING clauses](https://github.com/gotomicro/eql/pull/32)

db.go

@@ -33,7 +33,7 @@ type DB struct {
 // New returns DB. It's the entry of EQL
 func New(opts ...DBOption) *DB {
 	db := &DB{
-		metaRegistry:   defaultMetaRegistry,
+		metaRegistry:   &tagMetaRegistry{},
 		dialect:        mysql,
 		nullAssertFunc: NilAsNullFunc,
 	}

internal/common_fun.go

@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+
 package internal
 
 import (

model.go

@@ -40,14 +40,12 @@ type ColumnMeta struct {
 
 type tableMetaOption func(meta *TableMeta)
 
-// MetadaRegistry stores table metadata
+// MetaRegistry stores table metadata
 type MetaRegistry interface {
 	Get(table interface{}) (*TableMeta, error)
 	Register(table interface{}, opts ...tableMetaOption) (*TableMeta, error)
 }
 
-var defaultMetaRegistry = &tagMetaRegistry{}
-
 // tagMetaRegistry is the default implementation based on tag eql
 type tagMetaRegistry struct {
 	metas sync.Map

model_test.go

@@ -23,7 +23,8 @@ import (
 
 func TestTagMetaRegistry(t *testing.T) {
 	tm := &TestModel{}
-	meta, err := defaultMetaRegistry.Register(tm)
+	registry := &tagMetaRegistry{}
+	meta, err := registry.Register(tm)
 	if err != nil {
 		t.Fatal(err)
 	}