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org.andl.ra version by andl

Outputs a Selection (subset) of a relation (table) containing tuples (rows) that satisfy a condition.

The condition is defined by an arbitrary expression, which must be of type Boolean. The tuple is retained if the expression evaluates as true, else it is discarded.

All attributes (columns) are available to use as variables in the expression, provided the attribute name is a Jexl simple identifier.


The expression to be evaluated, written in JEXL expression language. See the Jexl documentation for details.

Input Ports

The input relation.

Output Ports

The output relation containing tuples that satisfy the expression.


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