NumberUtil (Apache Calcite core API)

```
public class NumberUtil
extends Object
```
Utility functions for working with numbers.

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static Double`	`add(Double a, Double b)`
`static DecimalFormat`	`decimalFormat(String pattern)` Creates a format.
`static Double`	`divide(Double a, Double b)`
`static NumberFormat`	`getApproxFormatter(boolean isFloat)`
`static BigInteger`	`getMaxUnscaled(int precision)`
`static BigInteger`	`getMinUnscaled(int precision)`
`static boolean`	`isValidDecimal(BigDecimal bd)` Returns whether a `BigDecimal` is a valid Farrago decimal.
`static Double`	`min(Double a, Double b)` Like `Math.min(int, int)` but null safe.
`static Double`	`multiply(Double a, Double b)`
`static BigInteger`	`powTen(int exponent)`
`static BigDecimal`	`rescaleBigDecimal(BigDecimal bd, int scale)`
`static long`	`round(double d)`
`static Double`	`subtract(Double a, Double b)`
`static BigDecimal`	`toBigDecimal(Number number)`
`static BigDecimal`	`toBigDecimal(Number number, int scale)`

public static DecimalFormat decimalFormat(String pattern)

Creates a format. Locale-independent.

public static BigInteger powTen(int exponent)

public static BigInteger getMaxUnscaled(int precision)

public static BigInteger getMinUnscaled(int precision)

public static BigDecimal rescaleBigDecimal(BigDecimal bd,
                                           int scale)

public static BigDecimal toBigDecimal(Number number,
                                      int scale)

public static BigDecimal toBigDecimal(Number number)

isValidDecimal
```
public static boolean isValidDecimal(BigDecimal bd)
```
Returns whether a BigDecimal is a valid Farrago decimal. If a BigDecimal's unscaled value overflows a long, then it is not a valid Farrago decimal.

public static NumberFormat getApproxFormatter(boolean isFloat)

public static Double add(Double a,
                         Double b)

public static Double subtract(Double a,
                              Double b)

public static Double divide(Double a,
                            Double b)

public static Double multiply(Double a,
                              Double b)

public static Double min(Double a,
                         Double b)

Like Math.min(int, int) but null safe.

Class NumberUtil