com.facebook.presto.spi.plan

Class TableScanNode

java.lang.Object

com.facebook.presto.spi.plan.PlanNode

com.facebook.presto.spi.plan.TableScanNode

@Immutable
public final class TableScanNode
extends PlanNode

Constructor Summary

Constructors

Constructor and Description
TableScanNode(Optional<SourceLocation> sourceLocation, PlanNodeId id, Optional<PlanNode> statsEquivalentPlanNode, TableHandle table, List<VariableReferenceExpression> outputVariables, Map<VariableReferenceExpression,ColumnHandle> assignments, List<TableConstraint<ColumnHandle>> tableConstraints, TupleDomain<ColumnHandle> currentConstraint, TupleDomain<ColumnHandle> enforcedConstraint)
TableScanNode(Optional<SourceLocation> sourceLocation, PlanNodeId id, TableHandle table, List<VariableReferenceExpression> outputVariables, Map<VariableReferenceExpression,ColumnHandle> assignments) This constructor is for JSON deserialization only.
TableScanNode(Optional<SourceLocation> sourceLocation, PlanNodeId id, TableHandle table, List<VariableReferenceExpression> outputVariables, Map<VariableReferenceExpression,ColumnHandle> assignments, List<TableConstraint<ColumnHandle>> tableConstraints, TupleDomain<ColumnHandle> currentConstraint, TupleDomain<ColumnHandle> enforcedConstraint)
TableScanNode(Optional<SourceLocation> sourceLocation, PlanNodeId id, TableHandle table, List<VariableReferenceExpression> outputVariables, Map<VariableReferenceExpression,ColumnHandle> assignments, TupleDomain<ColumnHandle> currentConstraint, TupleDomain<ColumnHandle> enforcedConstraint)

Method Summary

Modifier and Type	Method and Description
<R,C> R	accept(PlanVisitor<R,C> visitor, C context) A visitor pattern interface to operate on IR.
PlanNode	assignStatsEquivalentPlanNode(Optional<PlanNode> statsEquivalentPlanNode) Assigns statsEquivalentPlanNode to the plan node
LogicalProperties	computeLogicalProperties(LogicalPropertiesProvider logicalPropertiesProvider) Logical properties are a function of source properties and the operation performed by the plan node
Map<VariableReferenceExpression,ColumnHandle>	getAssignments() Get the mapping from symbols to columns
TupleDomain<ColumnHandle>	getCurrentConstraint() A TupleDomain that represents a predicate that every row this TableScan node produces is guaranteed to satisfy.
TupleDomain<ColumnHandle>	getEnforcedConstraint() A TupleDomain that represents a predicate that has been successfully pushed into this TableScan node.
List<VariableReferenceExpression>	getOutputVariables() The output from the upstream PlanNodes.
List<PlanNode>	getSources() Get the upstream PlanNodes (i.e., children) of the current PlanNode.
TableHandle	getTable() Get the table handle provided by connector
List<TableConstraint<ColumnHandle>>	getTableConstraints() Get table constraints defined by connector
PlanNode	replaceChildren(List<PlanNode> newChildren) Alter the upstream PlanNodes of the current PlanNode.
String	toString()

Methods inherited from class com.facebook.presto.spi.plan.PlanNode

getId, getSourceLocation, getStatsEquivalentPlanNode

Methods inherited from class java.lang.Object

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

Constructor Detail

TableScanNode

public TableScanNode(Optional<SourceLocation> sourceLocation,
                     PlanNodeId id,
                     TableHandle table,
                     List<VariableReferenceExpression> outputVariables,
                     Map<VariableReferenceExpression,ColumnHandle> assignments)

This constructor is for JSON deserialization only. Do not use!

TableScanNode

public TableScanNode(Optional<SourceLocation> sourceLocation,
                     PlanNodeId id,
                     TableHandle table,
                     List<VariableReferenceExpression> outputVariables,
                     Map<VariableReferenceExpression,ColumnHandle> assignments,
                     TupleDomain<ColumnHandle> currentConstraint,
                     TupleDomain<ColumnHandle> enforcedConstraint)

TableScanNode

public TableScanNode(Optional<SourceLocation> sourceLocation,
                     PlanNodeId id,
                     TableHandle table,
                     List<VariableReferenceExpression> outputVariables,
                     Map<VariableReferenceExpression,ColumnHandle> assignments,
                     List<TableConstraint<ColumnHandle>> tableConstraints,
                     TupleDomain<ColumnHandle> currentConstraint,
                     TupleDomain<ColumnHandle> enforcedConstraint)

TableScanNode

public TableScanNode(Optional<SourceLocation> sourceLocation,
                     PlanNodeId id,
                     Optional<PlanNode> statsEquivalentPlanNode,
                     TableHandle table,
                     List<VariableReferenceExpression> outputVariables,
                     Map<VariableReferenceExpression,ColumnHandle> assignments,
                     List<TableConstraint<ColumnHandle>> tableConstraints,
                     TupleDomain<ColumnHandle> currentConstraint,
                     TupleDomain<ColumnHandle> enforcedConstraint)

Method Detail

getTable

public TableHandle getTable()

Get the table handle provided by connector

getTableConstraints

public List<TableConstraint<ColumnHandle>> getTableConstraints()

Get table constraints defined by connector

getAssignments

public Map<VariableReferenceExpression,ColumnHandle> getAssignments()

Get the mapping from symbols to columns

getCurrentConstraint

@Nullable
public TupleDomain<ColumnHandle> getCurrentConstraint()

A TupleDomain that represents a predicate that every row this TableScan node produces is guaranteed to satisfy.

This guarantee can have different origins. For example, it may be successful predicate push down, or inherent guarantee provided by the underlying data. currentConstraint will only be used in planner. It is not transported to worker thus will be null on worker.

getEnforcedConstraint

public TupleDomain<ColumnHandle> getEnforcedConstraint()

A TupleDomain that represents a predicate that has been successfully pushed into this TableScan node. In other words, predicates that were removed from filters above the TableScan node because the TableScan node can guarantee it.

This field is used to make sure that predicates which were previously pushed down do not get lost in subsequent refinements of the table layout.

getSources

public List<PlanNode> getSources()

Description copied from class: PlanNode

Get the upstream PlanNodes (i.e., children) of the current PlanNode.

Specified by:

getSources in class PlanNode

computeLogicalProperties

public LogicalProperties computeLogicalProperties(LogicalPropertiesProvider logicalPropertiesProvider)

Description copied from class: PlanNode

Logical properties are a function of source properties and the operation performed by the plan node

Overrides:

computeLogicalProperties in class PlanNode

getOutputVariables

public List<VariableReferenceExpression> getOutputVariables()

Description copied from class: PlanNode

The output from the upstream PlanNodes. It should serve as the input for the current PlanNode.

Specified by:

getOutputVariables in class PlanNode

accept

public <R,C> R accept(PlanVisitor<R,C> visitor,
                      C context)

Description copied from class: PlanNode

A visitor pattern interface to operate on IR.

Overrides:

accept in class PlanNode

assignStatsEquivalentPlanNode

public PlanNode assignStatsEquivalentPlanNode(Optional<PlanNode> statsEquivalentPlanNode)

Description copied from class: PlanNode

Assigns statsEquivalentPlanNode to the plan node

Specified by:

assignStatsEquivalentPlanNode in class PlanNode

toString

public String toString()

Overrides:

toString in class Object

replaceChildren

public PlanNode replaceChildren(List<PlanNode> newChildren)

Description copied from class: PlanNode

Alter the upstream PlanNodes of the current PlanNode.

Specified by:

replaceChildren in class PlanNode