org.apache.tajo.plan.logical

Interface Projectable

All Known Implementing Classes:

DistinctGroupbyNode, EvalExprNode, GroupbyNode, IndexScanNode, JoinNode, PartitionedTableScanNode, ProjectionNode, ScanNode, TableSubQueryNode, WindowAggNode

public interface Projectable

Projectable is an interface for a LogicalNode which has a list of targets. What a logical node has a list of targets means that the node evaluated a list of expressions. For example, ScanNode, JoinNode, GroupbyNode, and ProjectionNode are all Projectable nodes. The expression evaluation occurs only at those projectable nodes.

Method Summary

Methods

Modifier and Type	Method and Description
Schema	getInSchema() Get an input schema
Schema	getOutSchema() Get an output schema
int	getPID() Get a PlanNode Id
Target[]	getTargets() Get a list of targets
boolean	hasTargets() check if this node has a target list
void	setTargets(Target[] targets) Set a target list

Method Detail

getPID

int getPID()

Get a PlanNode Id

Returns:

PlanNodeId

hasTargets

boolean hasTargets()

check if this node has a target list

Returns:

TRUE if this node has a target list. Otherwise, FALSE.

setTargets

void setTargets(Target[] targets)

Set a target list

Parameters:

targets - The array of targets

getTargets

Target[] getTargets()

Get a list of targets

Returns:

The array of targets

getInSchema

Schema getInSchema()

Get an input schema

Returns:

The input schema

getOutSchema

Schema getOutSchema()

Get an output schema

Returns:

The output schema