Package org.apache.druid.sql.calcite.expression

Interface DruidExpression.VirtualColumnCreator

All Known Implementing Classes:

DruidExpression.ExpressionVirtualColumnCreator

Enclosing class:

DruidExpression

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public static interface DruidExpression.VirtualColumnCreator

Used by a DruidExpression to translate itself into a VirtualColumn to add to a native query when referenced by a projection, filter, aggregator, etc.

Method Summary

Modifier and Type	Method	Description
VirtualColumn	create(String name, ColumnType outputType, ExpressionParser parser, DruidExpression self)	Create a virtual column for an expression.

Method Details

create

VirtualColumn create(String name,
 ColumnType outputType,
 ExpressionParser parser,
 DruidExpression self)

Create a virtual column for an expression.

Parameters:

name - name of the virtual column

outputType - type of the virtual column

parser - expression parser, if needed

self - expression, possibly rewritten to refer to specialized virtual columns