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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