diff --git a/quesma/clickhouse/clickhouse.go b/quesma/clickhouse/clickhouse.go
index b57d2c9ff..308bcdfae 100644
--- a/quesma/clickhouse/clickhouse.go
+++ b/quesma/clickhouse/clickhouse.go
@@ -35,6 +35,15 @@ const (
 	maxColumns = 100
 )
 
+type (
+	IngestFieldBucketKey struct {
+		indexName    string
+		field        string
+		insertBucket int
+	}
+	IngestFieldStatistics map[IngestFieldBucketKey]int
+)
+
 type (
 	// LogManager should be renamed to Connector  -> TODO !!!
 	LogManager struct {