RowExpression.From
Syntax
RowExpression.From(function as function) as record
About
Returns the abstract syntax tree (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
.
This function is identical to ItemExpression.From
.
Example 1
Returns the AST for the body of the function each [CustomerID] = "ALFKI"
.
Usage
RowExpression.From(each [CustomerName] = "ALFKI")
Output
[
Kind = "Binary",
Operator = "Equals",
Left = RowExpression.Column("CustomerName"),
Right =
[
Kind = "Constant",
Value = "ALFKI"
]
]