diff --git a/core/ephemeral.rs b/core/ephemeral.rs
index 503bf347c..c52049230 100644
--- a/core/ephemeral.rs
+++ b/core/ephemeral.rs
@@ -1,5 +1,5 @@
 use std::{
-    cell::{Ref, RefCell},
+    cell::RefCell,
     rc::Rc,
 };
 
@@ -632,7 +632,7 @@ mod tests {
             ))
         );
         assert_eq!(cursor.rowid, Some(2));
-        assert_eq!(cursor.null_flag, false);
+        assert!(!cursor.null_flag);
     }
 
     #[test]
@@ -669,7 +669,7 @@ mod tests {
             ))
         );
         assert_eq!(cursor.rowid, Some(3));
-        assert_eq!(cursor.null_flag, false);
+        assert!(!cursor.null_flag);
     }
 
     #[test]
@@ -698,6 +698,6 @@ mod tests {
         let result = cursor.do_seek(SeekKey::IndexKey(&key), SeekOp::EQ).unwrap();
         assert_eq!(result, CursorResult::Ok((None, None)));
         assert_eq!(cursor.rowid, None);
-        assert_eq!(cursor.null_flag, true);
+        assert!(cursor.null_flag);
     }
 }
diff --git a/core/schema.rs b/core/schema.rs
index 2b0cd8056..b8751958e 100644
--- a/core/schema.rs
+++ b/core/schema.rs
@@ -813,6 +813,12 @@ pub struct EphemeralTable {
     pub columns: Vec<Column>,                 // columns
 }
 
+impl Default for EphemeralTable {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl EphemeralTable {
     pub fn new() -> Self {
         Self {
diff --git a/core/vdbe/explain.rs b/core/vdbe/explain.rs
index 84a2bf33f..483bc2d4f 100644
--- a/core/vdbe/explain.rs
+++ b/core/vdbe/explain.rs
@@ -1,4 +1,4 @@
-use crate::{ephemeral, vdbe::builder::CursorType};
+use crate::vdbe::builder::CursorType;
 
 use super::{Insn, InsnReference, OwnedValue, Program};
 use std::rc::Rc;