Examples of io.crate.operation.reference.doc.lucene.CollectorContext.visitor()

            final Input<Boolean> condition = (Input<Boolean>) ctx.topLevelInputs().get(0);
            @SuppressWarnings("unchecked")
            final List<LuceneCollectorExpression> expressions = ctx.docLevelExpressions();
            final CollectorContext collectorContext = new CollectorContext();
            collectorContext.searchContext(searchContext);
            collectorContext.visitor(new LuceneDocCollector.CollectorFieldsVisitor(expressions.size()));


            for (LuceneCollectorExpression expression : expressions) {
                expression.startCollect(collectorContext);
            }
            Filter filter = new Filter() {

                        expression.setNextReader(context);
                    }
                    return BitsFilteredDocIdSet.wrap(
                            new FunctionDocSet(
                                    context.reader(),
                                    collectorContext.visitor(),
                                    condition,
                                    expressions,
                                    context.reader().maxDoc(),
                                    acceptDocs
                            ),

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