Package io.trino.sql.ir.optimizer.rule

Class EvaluateIsNull

java.lang.Object

io.trino.sql.ir.optimizer.rule.EvaluateIsNull

All Implemented Interfaces:

IrOptimizerRule

public class EvaluateIsNull
extends Object
implements IrOptimizerRule

Partial evaluation of IsNull. E.g.,

• $is_null(Row(...)) -> false
• $is_null(null) -> true
• $is_null(1::bigint) -> false
• $is_null($is_null(...) -> false
• $is_null(Cast(x, t)) -> $is_null(x)
• ...

Constructor Summary

Constructors

Constructor	Description
EvaluateIsNull()

Method Summary

Modifier and Type	Method	Description
Optional<Expression>	apply(Expression expression, Session session, Map<Symbol,Expression> bindings)

Methods inherited from class java.lang.Object

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

Constructor Details

EvaluateIsNull

public EvaluateIsNull()

Method Details

apply

public Optional<Expression> apply(Expression expression,
 Session session,
 Map<Symbol,Expression> bindings)

Specified by:

apply in interface IrOptimizerRule