Module org.apache.jena.arq
Package org.apache.jena.sparql.expr.aggregate
package org.apache.jena.sparql.expr.aggregate
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ClassDescriptionAn Accumulator is the processor for each section of a group, so there is one Accumulator for each group key.Accumulator that passes down every value of an expressionFactory to create accumulators.Syntax element and framework execution for custom aggregates.The null aggregate (which can't be written in SPARQL) calculates nothing but does help remember the group key.Registry of custom aggregates There is only a single global registry of aggregates - it affects parsing and parsing happens before Context or Execution makes sense.An Aggregator is the processor for the whole result stream.Aggregate that does everything except the per-group aggregation that is needed for each operationAn Args is an ExprList with a flag for DISTINCT.