Merge 'Fix INSERT INTO t DEFAULT VALUES' from Jussi Saurio

Closes #3279

Closes #3291

core/translate/insert.rs

@@ -348,10 +348,24 @@ pub fn translate_insert(
                 (result.num_result_cols, cursor_id)
             }
         }
-        InsertBody::DefaultValues => (
-            0,
-            program.alloc_cursor_id(CursorType::BTreeTable(btree_table.clone())),
-        ),
+        InsertBody::DefaultValues => {
+            let num_values = table.columns().len();
+            values = Some(
+                table
+                    .columns()
+                    .iter()
+                    .map(|c| {
+                        c.default
+                            .clone()
+                            .unwrap_or(Box::new(ast::Expr::Literal(ast::Literal::Null)))
+                    })
+                    .collect(),
+            );
+            (
+                num_values,
+                program.alloc_cursor_id(CursorType::BTreeTable(btree_table.clone())),
+            )
+        }
     };
     let has_upsert = upsert_opt.is_some();
 

testing/insert.test

@@ -633,3 +633,11 @@ do_execsql_test_on_specific_db {:memory:} boolean-literal-edgecase-false {
     CREATE TABLE false (id INTEGER, true TEXT);
     INSERT INTO false (id, true) VALUES (1, false) RETURNING id, false;
 } {1|0}
+
+do_execsql_test_on_specific_db {:memory:} default-values-population {
+    CREATE TABLE t (x INTEGER PRIMARY KEY, y DEFAULT 666, z);
+    INSERT INTO t DEFAULT VALUES;
+    INSERT INTO t DEFAULT VALUES;
+    SELECT * FROM t;
+} {1|666|
+2|666|}