private Expression parseRealLiteral(String value) {
    // 3.33 is float by default
    return new ConstantOperand(
        CONFIG.getFloatingStringInferType().equals(TSDataType.DOUBLE)
            ? TSDataType.DOUBLE
            : TSDataType.FLOAT,
        value);
  }
function for parsing file path used by LOAD statement.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/parser/ASTVisitor.java