Assert

This Node takes in an expression. It evaluates the expression and based on the results sends the execution to the first or the second output Node

Input

It accepts a DataFrame as input from the previous Node

Output

The incoming DataFrame is sent to the output. Only one of the output Nodes receives the DataFrame based on the results of the expression

Type

transform

Class

fire.nodes.etl.NodeAssert

Fields

Name	Title	Description
expression	Expression	Expression to be evaluated. It can use variables computed in the previous Nodes

Details

Assert Node Details

The Assert Node evaluates the specified expression and based on the Boolean result sends the data to either the first output node or the second output bode.

If expression evaluates to true then first output Node will display the dataframe records otherwise it will display records on the second output node.

The expression can contain variables generated by the execution of the previous nodes. One such node is the Count node. It would generate a variable with a value equal to the number of rows in the Dataframe which can be then evaluated in the Assert node.

Examples

Assert Node Example

Assume that we have used a Count Node before the Assert node which stores the output in the variable ‘Count’

In the Assert node Expression field , we have the expression value set as Count > 100

If the expression evaluates to true, the output would go to the first edge of the Assert node.

If the expression evaluates to false, the output would go to the second edge of the Assert node.