public static void checkFunctionExpressionInputSize(
      String expressionString, int actual, int... expected) {
    for (int expect : expected) {
      if (expect == actual) {
        return;
      }
    }
    throw new SemanticException(
        String.format(
            "Error size of input expressions. expression: %s, actual size: %s, expected size: %s.",
            expressionString, actual, Arrays.toString(expected)));
  }
function for parsing file path used by LOAD statement.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/parser/ASTVisitor.java