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RowExpression.From

Owen Duncan|Last Updated: 4/19/2018
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1 Contributor

RowExpression.From(function as function) as record

About

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, NotImplemented.

  • 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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