ItemExpression.From(function as function) as record


Returns the abstract syntax tree (AST) for the body of function, normalized into an item expression:

  • The function must be a 1-argument lambda.
  • All references to the function parameter are replaced with ItemExpression.Item.
  • The AST will be simplified to contain only nodes of the kinds:
    • Constant
    • Invocation
    • Unary
    • Binary
    • If
    • FieldAccess

An error is raised if an item expression AST cannot be returned for the body of function.

This function is identical to RowExpression.From.

Example 1

Returns the AST for the body of the function each _ <> null.


ItemExpression.From(each _ <> null)


    Kind = "Binary",
    Operator = "NotEquals",
    Left = ItemExpression.Item,
    Right =
        Kind = "Constant",
        Value = null