Module com.darkcollective.relix.processor

Package com.darkcollective.relix.processor.eval

package com.darkcollective.relix.processor.eval

Scalar expression and predicate evaluation for query execution.

Two evaluators drive all row-level computation:

• OperandEvaluator — evaluates any Operand expression against a Row, returning a Value. Handles all eight operand subtypes including arithmetic, attribute references, and the full built-in function catalogue.
• PredicateEvaluator — evaluates any Predicate against a row, returning a boolean. NULL values follow SQL three-valued logic.

EvaluationException is the unchecked exception thrown when evaluation cannot proceed (unknown column, type mismatch, bad function arity, etc.).

Related Packages

Package	Description
com.darkcollective.relix.processor	Row: one row of a result, a tuple of Values read by position or by column name.
com.darkcollective.relix.processor.connector	The connector provider interface, and connector plugin provisioning.
com.darkcollective.relix.processor.exec	Execution operators for the relix processor.
com.darkcollective.relix.processor.generator	Generator relations — leaf relations whose rows are produced by engine code rather than read from a file or database.
com.darkcollective.relix.processor.internal	The engine-side machinery behind com.darkcollective.relix.processor: not exported by the published artifact.
com.darkcollective.relix.processor.provenance	A relation annotated over a semiring, as Relation.provenance returns it.

Class	Description
AllocationRow	A candidate row paired with its continuous LP allocation value, as returned by SubsetOptimizer.allocate(com.darkcollective.relix.ast.ObjectiveSense, com.darkcollective.relix.ast.Operand, java.util.List<com.darkcollective.relix.ast.OptimizeConstraint>, double, double, java.util.List<com.darkcollective.relix.processor.Row>, java.lang.String).
EquationSolver	Fills the single unknown column of a row by inverting a goal-seek equation left = right (the engine side of the SOLVE operator).
OperandEvaluator	Evaluates an Operand expression against a Row, producing a runtime Value.
PredicateEvaluator	Evaluates a Predicate against a Row, returning a boolean result.
SubsetOptimizer	Chooses the optimal subset of a group's rows under a linear objective and linear constraints — the 0/1 knapsack / portfolio-selection problem behind the OPTIMIZE operator.
TemporalDistance	The absolute temporal distance between two values — the metric that complements ValueComparator's order, for the operators that bound how far apart two rows may be (the AS-OF join's WITHIN tolerance).
ValueComparator	Total ordering over Value instances for use in sort and aggregation operators.