feat(datastore): Additional comments

datastore/query.go

@@ -634,6 +634,8 @@
 
 // ExplainOptions is explain options for the query.
 type ExplainOptions struct {
+	// When false (the default), the query will be planned, returning only
+	// metrics from the planning stages.
 	// When true, the query will be planned and executed, returning the full
 	// query results along with both planning and execution stage metrics.
 	Analyze bool
@@ -669,7 +671,7 @@
 	return s, nil
 }
 
 // Planning phase information for the query.
 type Plan struct {
 	// The indexes selected for the query. For example:
 	//
@@ -680,7 +682,7 @@
 	IndexesUsed []*map[string]interface{}
 }
 
 // Execution statistics for the query.
 type ExecutionStats struct {
 	// Total number of results returned, including documents, projections,
 	// aggregation results, keys.