Class RemoveRedundantCoalesceArguments

java.lang.Object

io.trino.sql.ir.optimizer.rule.RemoveRedundantCoalesceArguments

All Implemented Interfaces:

IrOptimizerRule

public class RemoveRedundantCoalesceArguments
extends Object
implements IrOptimizerRule

Remove duplicate deterministic arguments and any argument after the first non-null constant. E.g,

• Coalesce(a, b, c, a, d) -> Coalesce(a, b, c, d)
• Coalesce(a, b, 'hello', c, d) -> Coalesce(a, b, 'hello')

Constructor Summary

Constructors

Constructor	Description
RemoveRedundantCoalesceArguments()

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

RemoveRedundantCoalesceArguments

public RemoveRedundantCoalesceArguments()

Method Details

apply

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

Specified by:

apply in interface IrOptimizerRule