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

Class PruneTableFunctionProcessorSourceColumns

java.lang.Object

io.trino.sql.planner.iterative.rule.PruneTableFunctionProcessorSourceColumns

All Implemented Interfaces:

Rule<TableFunctionProcessorNode>

public class PruneTableFunctionProcessorSourceColumns
extends Object
implements Rule<TableFunctionProcessorNode>

This rule prunes unreferenced outputs of TableFunctionProcessorNode. First, it extracts all symbols required for: - pass-through - table function computation - partitioning and ordering (including the hashSymbol) Next, a mapping of input symbols to marker symbols is updated so that it only contains mappings for the required symbols. Last, all the remaining marker symbols are added to the collection of required symbols. Any source output symbols not included in the required symbols can be pruned.

Nested Class Summary

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

Rule.Context, Rule.Result

Constructor Summary

Constructors

Constructor	Description
PruneTableFunctionProcessorSourceColumns()

Method Summary

Modifier and Type	Method	Description
Rule.Result	apply(TableFunctionProcessorNode node, Captures captures, Rule.Context context)
Pattern<TableFunctionProcessorNode>	getPattern()	Returns a pattern to which plan nodes this rule applies.

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

PruneTableFunctionProcessorSourceColumns

public PruneTableFunctionProcessorSourceColumns()

Method Details

getPattern

public Pattern<TableFunctionProcessorNode> getPattern()

Description copied from interface: Rule

Returns a pattern to which plan nodes this rule applies.

Specified by:

getPattern in interface Rule<TableFunctionProcessorNode>

apply

public Rule.Result apply(TableFunctionProcessorNode node,
 Captures captures,
 Rule.Context context)

Specified by:

apply in interface Rule<TableFunctionProcessorNode>