Add distance negative checking

sue445 · sue445 · commit 4dba2d487a9c · 2019-12-03T21:45:46.000+09:00
diff --git a/db/schema_explorer.go b/db/schema_explorer.go
@@ -25,6 +25,10 @@ func NewSchemaExplorer(schema *Schema) *SchemaExplorer {
 
 // Explore returns surrounding tables from table
 func (e *SchemaExplorer) Explore(tableName string, distance int) []string {
+	if distance < 0 {
+		distance = 0
+	}
+
 	foundTableNames := mapset.NewSet()
 
 	e.explore(tableName, distance, foundTableNames, 0)
