feat: impl scanning data from storage engine for table (#47)

* feat: impl scanning data from storage for MitoTable

* adds test mod to setup table engine test

* fix: comment error

* fix: boyan -> dennis in todo comments

* fix: remove necessary send in BatchIteratorPtr

src/datanode/src/error.rs

@@ -5,7 +5,7 @@ use datatypes::prelude::ConcreteDataType;
 use table::error::Error as TableError;
 use table_engine::error::Error as TableEngineError;
 
-// TODO(boyan): use ErrorExt instead.
+// TODO(dennis): use ErrorExt instead.
 pub type BoxedError = Box<dyn std::error::Error + Send + Sync>;
 
 /// Business error of datanode.

src/datanode/src/instance.rs

@@ -79,7 +79,7 @@ impl Instance {
     }
 
     pub async fn start(&self) -> Result<()> {
-        // FIXME(boyan): create a demo table for test
+        // FIXME(dennis): create a demo table for test
         let column_schemas = vec![
             ColumnSchema::new("host", ConcreteDataType::string_datatype(), false),
             ColumnSchema::new("cpu", ConcreteDataType::float64_datatype(), true),