Package org.apache.druid.frame.write.cast

Class TypeCastSelectors

java.lang.Object

org.apache.druid.frame.write.cast.TypeCastSelectors

public class TypeCastSelectors
extends Object

Constructor Summary

Constructors

Constructor	Description
TypeCastSelectors()

Method Summary

Modifier and Type	Method	Description
static Object	bestEffortCoerce(Object obj, ExpressionType desiredType)	Coerce an object to an object compatible with what BaseObjectColumnValueSelector.getObject() for a column of the provided desiredType.
static ColumnValueSelector<?>	makeColumnValueSelector(ColumnSelectorFactory columnSelectorFactory, String column, ColumnType desiredType)	Create a ColumnValueSelector that does its own typecasting if necessary.
static ColumnValueSelector<?>	wrapColumnValueSelectorIfNeeded(ColumnValueSelector<?> selector, ColumnCapabilities selectorCapabilities, RowIdSupplier rowIdSupplier, ColumnType desiredType)	Wraps a ColumnValueSelector with a type casting selector if necessary.

Methods inherited from class java.lang.Object

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

Constructor Details

TypeCastSelectors

public TypeCastSelectors()

Method Details

makeColumnValueSelector

public static ColumnValueSelector<?> makeColumnValueSelector(ColumnSelectorFactory columnSelectorFactory,
 String column,
 ColumnType desiredType)

Create a ColumnValueSelector that does its own typecasting if necessary. If typecasting is not necessary, returns a selector directly from the underlying ColumnSelectorFactory.

Parameters:

columnSelectorFactory - underlying factory

column - column name

desiredType - desired type of selector. Can be anything except ColumnType.STRING. For strings, use DimensionSelector rather than ColumnValueSelector.

wrapColumnValueSelectorIfNeeded

public static ColumnValueSelector<?> wrapColumnValueSelectorIfNeeded(ColumnValueSelector<?> selector,
 @Nullable
 ColumnCapabilities selectorCapabilities,
 @Nullable
 RowIdSupplier rowIdSupplier,
 ColumnType desiredType)

Wraps a ColumnValueSelector with a type casting selector if necessary. If typecasting is not necessary, returns the original selector.

Parameters:

selector - selector

selectorCapabilities - capabilities for the selector, from ColumnSelectorFactory.getColumnCapabilities(java.lang.String)

rowIdSupplier - row id supplier, from ColumnSelectorFactory.getRowIdSupplier()

desiredType - desired type for the returned selector

bestEffortCoerce

@Nullable
public static Object bestEffortCoerce(@Nullable
 Object obj,
 @Nullable
 ExpressionType desiredType)

Coerce an object to an object compatible with what BaseObjectColumnValueSelector.getObject() for a column of the provided desiredType.

Parameters:

obj - object

desiredType - desired type