Refactored query engine utilizing iterators

internal/converters/document_to_rowtype.go

@@ -0,0 +1,20 @@
+package converters
+
+import (
+	"github.com/pikami/cosmium/internal/datastore"
+	memoryexecutor "github.com/pikami/cosmium/query_executors/memory_executor"
+)
+
+type DocumentToRowTypeIterator struct {
+	documents datastore.DocumentIterator
+}
+
+func NewDocumentToRowTypeIterator(documents datastore.DocumentIterator) *DocumentToRowTypeIterator {
+	return &DocumentToRowTypeIterator{
+		documents: documents,
+	}
+}
+
+func (di *DocumentToRowTypeIterator) Next() (memoryexecutor.RowType, datastore.DataStoreStatus) {
+	return di.documents.Next()
+}

internal/datastore/datastore.go

@@ -40,5 +40,4 @@ type DataStore interface {
 
 type DocumentIterator interface {
 	Next() (Document, DataStoreStatus)
-	HasMore() bool
 }

internal/datastore/map_datastore/array_document_iterator.go

@@ -15,7 +15,3 @@ func (i *ArrayDocumentIterator) Next() (datastore.Document, datastore.DataStoreS
 
 	return i.documents[i.index], datastore.StatusOk
 }
-
-func (i *ArrayDocumentIterator) HasMore() bool {
-	return i.index < len(i.documents)-1
-}

internal/datastore/models.go

@@ -15,6 +15,7 @@ const (
 	StatusNotFound = 2
 	Conflict       = 3
 	BadRequest     = 4
+	IterEOF        = 5
 )
 
 type TriggerOperation string