add in a table test with multiple columns (#886)

src/tests/test_table_operations.rs

@@ -103,6 +103,15 @@ fn command_filter_reject_3() -> TestResult {
     )
 }
 
+#[test]
+#[rustfmt::skip]
+fn command_filter_reject_4() -> TestResult {
+    run_test(
+        "[[lang, gems, grade]; [nu, 100, a]] | reject gems | to json -r",
+        r#"[{"lang": "nu","grade": "a"}]"#,
+    )
+}
+
 #[test]
 fn command_drop_column_1() -> TestResult {
     run_test(