io.prestosql.sql.planner.iterative.rule

Class RemoveEmptyDelete

java.lang.Object

io.prestosql.sql.planner.iterative.rule.RemoveEmptyDelete

All Implemented Interfaces:

Rule<TableFinishNode>

public class RemoveEmptyDelete
extends Object
implements Rule<TableFinishNode>

If the predicate for a delete is optimized to false, the target table scan of the delete will be replaced with an empty values node. This type of plan cannot be executed and is meaningless anyway, so we replace the entire thing with a values node.

Transforms

  - TableFinish
    - Exchange
      - Delete
        - empty Values
 

into

  - Values (0)
 

Nested Class Summary

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

Rule.Context, Rule.Result

Constructor Summary

Constructors

Constructor and Description
RemoveEmptyDelete()

Method Summary

Modifier and Type	Method and Description
Rule.Result	apply(TableFinishNode node, Captures captures, Rule.Context context)
Pattern<TableFinishNode>	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.prestosql.sql.planner.iterative.Rule

isEnabled

Constructor Detail

RemoveEmptyDelete

public RemoveEmptyDelete()

Method Detail

getPattern

public Pattern<TableFinishNode> getPattern()

Description copied from interface: Rule

Returns a pattern to which plan nodes this rule applies.

Specified by:

getPattern in interface Rule<TableFinishNode>

apply

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

Specified by:

apply in interface Rule<TableFinishNode>