diff --git a/src/dto/mod.rs b/src/dto/mod.rs
index 1e6a204..131a66b 100644
--- a/src/dto/mod.rs
+++ b/src/dto/mod.rs
@@ -1,3 +1,4 @@
 pub mod namespace_data;
 pub mod operator_statistics;
 pub mod table_data;
+pub mod column_data;
\ No newline at end of file
diff --git a/src/dto/table_data.rs b/src/dto/table_data.rs
index 07d83a9..1707108 100644
--- a/src/dto/table_data.rs
+++ b/src/dto/table_data.rs
@@ -1,6 +1,6 @@
 use serde::{Deserialize, Serialize};
 use serde_json::Value;
-use ColumnData;
+use crate::dto::column_data::ColumnData;
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct TableData {