Package org.apache.druid.math.expr

Class ExpressionPredicateIndexSupplier

java.lang.Object

org.apache.druid.math.expr.ExpressionPredicateIndexSupplier

All Implemented Interfaces:

ColumnIndexSupplier

public class ExpressionPredicateIndexSupplier
extends Object
implements ColumnIndexSupplier

Constructor Summary

Constructors

Constructor	Description
ExpressionPredicateIndexSupplier(Expr expr, String inputColumn, ExpressionType inputType, ColumnType outputType, DictionaryEncodedValueIndex<?> inputColumnValueIndexes)

Method Summary

Modifier and Type	Method	Description
<T> T	as(Class<T> clazz)	Try to get a column 'index' of the specified type.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionPredicateIndexSupplier

public ExpressionPredicateIndexSupplier(Expr expr,
                                        String inputColumn,
                                        ExpressionType inputType,
                                        ColumnType outputType,
                                        DictionaryEncodedValueIndex<?> inputColumnValueIndexes)

Method Detail

as

@Nullable
public <T> T as(Class<T> clazz)

Description copied from interface: ColumnIndexSupplier

Try to get a column 'index' of the specified type. If the index of the desired type is not available, this method will return null. If the value is non-null, the index may be used for the eventual construction of an Offset to form the basis of a Cursor (or VectorOffset and VectorCursor) which can greatly reduce the total number of rows which need to be scanned and processed. Objects returned by this method are not thread-safe.

Specified by:

as in interface ColumnIndexSupplier