RowExpression.From

 

RowExpression.From(function as function) as record

Returns the AST for the body of function, normalized into a row expression.

The function must be a 1-argument lambda.

All references to the function parameter are replaced with RowExpression.Row.

All references to columns are replaced with RowExpression.Column(columnName).

The AST will be simplified to contain only nodes of the kinds:

Constant

Invocation

Unary

Binary

If

FieldAccess

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

Example 1

Returns the AST for the body of the function each [CustomerID] = "ALFKI"

RowExpression.From(each [CustomerName] = "ALFKI")  

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