Package io.trino.sql.tree

Class BindExpression

java.lang.Object

io.trino.sql.tree.Node

io.trino.sql.tree.Expression

io.trino.sql.tree.BindExpression

public class BindExpression
extends Expression

"$INTERNAL$BIND"(value, targetFunction)

When invoked, the returned function inserts the given value as the leading argument to the targetFunction. The other arguments are passed unchanged.

Bind is fundamentally first class, just like function applications. It requires special treatment from the type system. There is no way to write out the type of `bind`. The return type of `bind` is function. Its type looks somewhat like:

• X, (X) -> Y => () -> Y
• X1, (X1, X2) -> Y => (X2) -> Y
• X1, (X1, X2, X3) -> Y => (X2, X3) -> Y
• X1, (X1, X2, X3, X4) -> Y => (X2, X3, X4) -> Y
• ...

Lambda capturing is implemented through desugaring in Trino. This expression facilitates desugaring.

Constructor Summary

Constructors

Constructor	Description
BindExpression(NodeLocation location, List<Expression> values, Expression function)
BindExpression(List<Expression> values, Expression function)

Method Summary

Modifier and Type	Method	Description
<R, C> R	accept(AstVisitor<R,C> visitor, C context)	Accessible for AstVisitor, use AstVisitor.process(Node, Object) instead.
boolean	equals(Object o)
List<Node>	getChildren()
Expression	getFunction()
List<Expression>	getValues()
int	hashCode()
boolean	shallowEquals(Node other)	Compare with another node by considering internal state excluding any Node returned by getChildren()

Methods inherited from class io.trino.sql.tree.Expression

toString

Methods inherited from class io.trino.sql.tree.Node

getLocation

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

BindExpression

public BindExpression(List<Expression> values,
 Expression function)

BindExpression

public BindExpression(NodeLocation location,
 List<Expression> values,
 Expression function)

Method Details

getValues

public List<Expression> getValues()

getFunction

public Expression getFunction()

accept

public <R,
C> R accept(AstVisitor<R,C> visitor,
 C context)

Description copied from class: Expression

Accessible for AstVisitor, use AstVisitor.process(Node, Object) instead.

Overrides:

accept in class Expression

getChildren

public List<Node> getChildren()

Specified by:

getChildren in class Node

equals

public boolean equals(Object o)

Specified by:

equals in class Node

hashCode

public int hashCode()

Specified by:

hashCode in class Node

shallowEquals

public boolean shallowEquals(Node other)

Description copied from class: Node

Compare with another node by considering internal state excluding any Node returned by getChildren()

Overrides:

shallowEquals in class Node