ai.rapids.cudf

Class DecimalUtils

java.lang.Object

ai.rapids.cudf.DecimalUtils

public class DecimalUtils
extends Object

Constructor Summary

Constructors

Constructor and Description
DecimalUtils()

Method Summary

Modifier and Type	Method and Description
static Map.Entry<BigDecimal,BigDecimal>	bounds(int precision, int scale) Given decimal precision and scale, returns the lower and upper bound of current decimal type.
static DType	createDecimalType(int precision, int scale) Creates a cuDF decimal type with precision and scale
static ColumnVector	greaterThan(ColumnView lhs, BigDecimal rhs) Because the native greaterThan operator has issues with comparing decimal values that have different precision and scale accurately.
static ColumnVector	lessThan(BinaryOperable lhs, BigDecimal rhs, int numRows) Because the native lessThan operator has issues with comparing decimal values that have different precision and scale accurately.
static ColumnVector	lessThan(ColumnView lhs, BigDecimal rhs) Because the native lessThan operator has issues with comparing decimal values that have different precision and scale accurately.
static ColumnVector	outOfBounds(ColumnView input, int precision, int scale) With precision and scale, checks each value of input decimal column for out of bound.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DecimalUtils

public DecimalUtils()

Method Detail

createDecimalType

public static DType createDecimalType(int precision,
                                      int scale)

Creates a cuDF decimal type with precision and scale

bounds

public static Map.Entry<BigDecimal,BigDecimal> bounds(int precision,
                                                      int scale)

Given decimal precision and scale, returns the lower and upper bound of current decimal type. Be very careful when comparing these CUDF decimal comparisons really only work when both types are already the same precision and scale, and when you change the scale you end up losing information.

Parameters:

precision - the max precision of decimal type

scale - the scale of decimal type

Returns:

a Map Entry of BigDecimal, lower bound as the key, upper bound as the value

outOfBounds

public static ColumnVector outOfBounds(ColumnView input,
                                       int precision,
                                       int scale)

With precision and scale, checks each value of input decimal column for out of bound.

Returns:

the boolean column represents whether specific values are out of bound or not

lessThan

public static ColumnVector lessThan(ColumnView lhs,
                                    BigDecimal rhs)

Because the native lessThan operator has issues with comparing decimal values that have different precision and scale accurately. This method takes some special steps to get rid of these issues.

lessThan

public static ColumnVector lessThan(BinaryOperable lhs,
                                    BigDecimal rhs,
                                    int numRows)

Because the native lessThan operator has issues with comparing decimal values that have different precision and scale accurately. This method takes some special steps to get rid of these issues.

greaterThan

public static ColumnVector greaterThan(ColumnView lhs,
                                       BigDecimal rhs)

Because the native greaterThan operator has issues with comparing decimal values that have different precision and scale accurately. This method takes some special steps to get rid of these issues.