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

Class RemoveEmptyMergeWriterRuleSet

java.lang.Object

io.trino.sql.planner.iterative.rule.RemoveEmptyMergeWriterRuleSet

public final class RemoveEmptyMergeWriterRuleSet
extends Object

If the predicate for a mergeWriter is optimized to false, the target table scan of the mergeWriter 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 (optional)
      - MergeWriter
        - Exchange
          - Project
            - empty Values
 

into

  - Values (0)
 

Method Summary

Modifier and Type	Method	Description
static Set<Rule<?>>	rules()

Methods inherited from class java.lang.Object

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

Method Details

rules

public static Set<Rule<?>> rules()