diff --git a/src/analyzer/indexer.rs b/src/analyzer/indexer.rs
index ac3e4fc..ed7ddd6 100644
--- a/src/analyzer/indexer.rs
+++ b/src/analyzer/indexer.rs
@@ -110,10 +110,10 @@ impl Indexer {
         schema,
         name,
         ..
-      } = r#enum.ident.clone();
+      } = &r#enum.ident;
 
       let schema = schema
-        .clone()
+        .as_ref()
         .map(|s| s.to_string.clone())
         .unwrap_or_else(|| DEFAULT_SCHEMA.into());
 
@@ -222,7 +222,7 @@ impl Indexer {
     enum_name: &String,
     values: &Vec<String>,
   ) -> (bool, (bool, Vec<bool>)) {
-    let schema = schema.clone().unwrap_or_else(|| DEFAULT_SCHEMA.into());
+    let schema = schema.clone().unwrap_or_else(|| DEFAULT_SCHEMA.to_string());
 
     match self.schema_map.get(&schema) {
       Some(block) => {
@@ -357,7 +357,7 @@ impl IndexedRef {
       tables
         .iter()
         .find(|table| {
-          table.ident.schema.clone().map(|s| s.to_string) == ref_ident.schema.clone().map(|s| s.to_string)
+          table.ident.schema.as_ref().map(|s| &s.to_string) == ref_ident.schema.as_ref().map(|s| &s.to_string)
             && table.ident.name.to_string == ref_ident.table.to_string
         })
         .map(Ok)
diff --git a/src/analyzer/mod.rs b/src/analyzer/mod.rs
index a0514a8..6c33ac5 100644
--- a/src/analyzer/mod.rs
+++ b/src/analyzer/mod.rs
@@ -420,7 +420,7 @@ pub fn analyze(schema_block: &SchemaBlock) -> AnalyzerResult<AnalyzedIndexer> {
     .collect::<AnalyzerResult<_>>()?;
 
   // validate ref
-  for indexed_ref in indexed_refs.clone() {
+  for indexed_ref in &indexed_refs {
     indexed_ref.validate_ref_type(&tables, &indexer, input)?;
 
     let count = indexed_refs
diff --git a/src/ast/table.rs b/src/ast/table.rs
index 29f5283..dbac33d 100644
--- a/src/ast/table.rs
+++ b/src/ast/table.rs
@@ -184,7 +184,7 @@ pub struct ColumnSettings {
   /// A default value for the column.
   pub default: Option<Value>,
   /// A vector of inline references associated with the column.
-  pub refs: Vec<refs::RefInline>,
+  pub refs: Vec<RefInline>,
 }
 
 /// A struct representing a table identifier.