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

Class RemoveRedundantTableFunction

java.lang.Object

io.trino.sql.planner.iterative.rule.RemoveRedundantTableFunction

All Implemented Interfaces:

Rule<TableFunctionProcessorNode>

public class RemoveRedundantTableFunction
extends Object
implements Rule<TableFunctionProcessorNode>

Table function can take multiple table arguments. Each argument is either "prune when empty" or "keep when empty". "Prune when empty" means that if this argument has no rows, the function result is empty, so the function can be removed from the plan, and replaced with empty values. "Keep when empty" means that even if the argument has no rows, the function should still be executed, and it can return a non-empty result. All the table arguments are combined into a single source of a TableFunctionProcessorNode. If either argument is "prune when empty", the overall result is "prune when empty". This rule removes a redundant TableFunctionProcessorNode based on the "prune when empty" property.

Nested Class Summary

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

Rule.Context, Rule.Result

Constructor Summary

Constructors

Constructor	Description
RemoveRedundantTableFunction()

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

RemoveRedundantTableFunction

public RemoveRedundantTableFunction()

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>