Package io.deephaven.engine.util

Class BigDecimalUtils

java.lang.Object

io.deephaven.engine.util.BigDecimalUtils

public class BigDecimalUtils
extends Object

Utilities to support BigDecimal exhaust. Parquet and Avro decimal types make a whole column decimal type have a fixed precision and scale; BigDecimal columns in Deephaven are, each value, arbitrary precision (its own precision and scale). For static tables, it is possible to compute overall precision and scale values that fit every existing value. For refreshing tables, we need the user to tell us.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	BigDecimalUtils.PrecisionAndScale	Immutable way to store and pass precision and scale values.
static class	BigDecimalUtils.PropertyNames	Immutable way to store and pass properties to get precision and scale for a given named column.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	INVALID_PRECISION_OR_SCALE

Constructor Summary

Constructors

Constructor	Description
BigDecimalUtils()

Method Summary

Modifier and Type	Method	Description
static BigDecimalUtils.PrecisionAndScale	computePrecisionAndScale(RowSet rowSet, ColumnSource<BigDecimal> source)	Compute an overall precision and scale that would fit all existing values in a column source.
static BigDecimalUtils.PrecisionAndScale	computePrecisionAndScale(Table t, String colName)	Compute an overall precision and scale that would fit all existing values in a table.
static BigDecimalUtils.PrecisionAndScale	getPrecisionAndScaleFromColumnProperties(BigDecimalUtils.PropertyNames propertyNames, Properties columnProperties, boolean allowNulls)	Get a PrecisionAndScale value from a object.
static void	setProperties(Properties props, BigDecimalUtils.PropertyNames names, BigDecimalUtils.PrecisionAndScale values)	Set the given names and values in the supplied Properties object.

Methods inherited from class java.lang.Object

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

Field Details

INVALID_PRECISION_OR_SCALE

public static final int INVALID_PRECISION_OR_SCALE

See Also:

• Constant Field Values

Constructor Details

BigDecimalUtils

public BigDecimalUtils()

Method Details

computePrecisionAndScale

public static BigDecimalUtils.PrecisionAndScale computePrecisionAndScale(Table t,
 String colName)

Compute an overall precision and scale that would fit all existing values in a table.

Parameters:

t - a Deephaven table

colName - a Column for t, which should be of BigDecimal type

Returns:

a PrecisionAndScale object result.

computePrecisionAndScale

public static BigDecimalUtils.PrecisionAndScale computePrecisionAndScale(RowSet rowSet,
 ColumnSource<BigDecimal> source)

Compute an overall precision and scale that would fit all existing values in a column source. Note that this requires a full table scan to ensure the correct values are determined.

Parameters:

rowSet - The rowset for the provided column

source - a ColumnSource of BigDecimal type

Returns:

a PrecisionAndScale object result.

getPrecisionAndScaleFromColumnProperties

public static BigDecimalUtils.PrecisionAndScale getPrecisionAndScaleFromColumnProperties(BigDecimalUtils.PropertyNames propertyNames,
 Properties columnProperties,
 boolean allowNulls)

Get a PrecisionAndScale value from a object.

Parameters:

propertyNames - The property names to read.

columnProperties - The object from where to read the properties

allowNulls - If true, do not throw when a property is missing, instead set the value to

Returns:

A object with the values read.

setProperties

public static void setProperties(Properties props,
 BigDecimalUtils.PropertyNames names,
 BigDecimalUtils.PrecisionAndScale values)

Set the given names and values in the supplied Properties object.

Parameters:

props - Properties where the given property names and values would be set.

names - Property names to set

values - Property values to set