@Test
  public void testVisitCallExpressionIsNull() {
    String isNullExpr = "id is NULL";
    List<ResolvedExpression> resolved = resolveSQLFilterToExpression(isNullExpr, schema);
    assertEquals(1, resolved.size());
    RowDataPredicate rowDataPredicate = resolved.get(0).accept(visitor).get();
    assertTrue(rowDataPredicate.test(GenericRowData.of(null, StringData.fromString("1"), 6)));
  }
This class contains unit tests for the {@link RowDataPredicateExpressionVisitor} class.
amoro-format-mixed/amoro-mixed-flink/amoro-mixed-flink-common/src/test/java/org/apache/amoro/flink/lookup/filter/TestRowDataPredicateExpressionVisitor.java