FILTER

This operator uses a Boolean expression.

If the coming element:

  • Matches the expression, it goes through the output.
  • Does not match the expression, nothing goes through the output.

This operator is stateless and the context of processing is only 1 element. If the Input Stream is ordered, the order is conserved.

For more information, see SEARCH and Expression Language.

This page discusses:

See Also
Expression Language
Defining and Managing Data Queries

Input

There is one Input. There are no constraints on the element type or on the number of elements in the stream.

Output

There must be one Output. The element type is identical to the input.

The output stream contains as many elements as the input stream. It does not affect the order (if any) of the elements in the stream.

Configuration

Parameter Type Comment
Expression Boolean expression Elements for which the Boolean expression is true can pass the filter.