default void checkBuiltInScalarFunctionInputSize(FunctionExpression functionExpression)
      throws SemanticException {
    checkFunctionExpressionInputSize(
        functionExpression.getExpressionString(), functionExpression.getExpressions().size(), 1);
  }
Check if the input size is correct. For example, function DIFF only supports one column as
input. Throw {@link SemanticException} if the input size is not correct.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/expression/multi/builtin/BuiltInScalarFunctionHelper.java