Package io.trino.sql.planner.iterative.rule

Class PruneTableFunctionProcessorColumns

java.lang.Object

io.trino.sql.planner.iterative.rule.ProjectOffPushDownRule<TableFunctionProcessorNode>

io.trino.sql.planner.iterative.rule.PruneTableFunctionProcessorColumns

All Implemented Interfaces:

Rule<ProjectNode>

public class PruneTableFunctionProcessorColumns
extends ProjectOffPushDownRule<TableFunctionProcessorNode>

TableFunctionProcessorNode has two kinds of outputs: - proper outputs, which are the columns produced by the table function, - pass-through outputs, which are the columns copied from table arguments. This rule filters out unreferenced pass-through symbols. Unreferenced proper symbols are not pruned, because there is currently no way to communicate to the table function the request for not producing certain columns. // TODO prune table function's proper outputs

Nested Class Summary

Nested classes/interfaces inherited from interface io.trino.sql.planner.iterative.Rule

Rule.Context, Rule.Result

Constructor Summary

Constructors

Constructor	Description
PruneTableFunctionProcessorColumns()

Method Summary

Modifier and Type	Method	Description
protected Optional<PlanNode>	pushDownProjectOff(Rule.Context context, TableFunctionProcessorNode node, Set<Symbol> referencedOutputs)

Methods inherited from class io.trino.sql.planner.iterative.rule.ProjectOffPushDownRule

apply, getPattern

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.trino.sql.planner.iterative.Rule

isEnabled

Constructor Details

PruneTableFunctionProcessorColumns

public PruneTableFunctionProcessorColumns()

Method Details

pushDownProjectOff

protected Optional<PlanNode> pushDownProjectOff(Rule.Context context,
 TableFunctionProcessorNode node,
 Set<Symbol> referencedOutputs)

Specified by:

pushDownProjectOff in class ProjectOffPushDownRule<TableFunctionProcessorNode>