- for Long values, the conversion from long to double can lead to loss of precision. Eg.

```
SELECT  CAST(ROUND(922337203685477580) AS LONG) as a
```

returns

```
922337203685477632
```

- for floating point values, when the two numbers passed to ROUND() funciton are too big, the values are truncated to Long.MAX_VALUE and hence wrongly rounded. Eg.

```
SELECT  ROUND(100000000000.0, 8) as a
```

returns

```
9.223372036854776E10
```
x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/function/scalar/math/BinaryOptionalMathProcessor.java
/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0; you may not use this file except in compliance with the Elastic License
 * 2.0.
 */
package org.elasticsearch.xpack.sql.expression.function.scalar.math;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.xpack.ql.expression.gen.processor.Processor;
import org.elasticsearch.xpack.sql.SqlIllegalArgumentException;
import java.io.IOException;
import java.util.Objects;
import java.util.function.BiFunction;
/**
 * Processor for binary mathematical operations that have a second optional parameter.
 */
public class BinaryOptionalMathProcessor implements Processor {