lib/Query/Common/CriterionVisitor/CustomField/CustomFieldIn.php
public function visit(Criterion $criterion, CriterionVisitor $subVisitor = null)
    {
        $queries = array();
        $values = (array)$criterion->value;

        foreach ($values as $value) {
            $preparedValue = $this->escapeQuote($this->toString($value), true);

            if ($this->isRegExp($preparedValue)) {
                $queries[] = $criterion->target . ':' . $preparedValue;
            } else {
                $queries[] = $criterion->target . ':"' . $preparedValue . '"';
            }
        }

        return '(' . implode(' OR ', $queries) . ')';
    }
public function visit(Criterion $criterion, CriterionVisitor $subVisitor = null)
    {
        $queries = array();
        $values = (array)$criterion->value;

        foreach ($values as $value) {
            $preparedValue = $this->escapeQuote($this->toString($value), true);

            if ($this->isRegExp($preparedValue)) {
                $queries[] = $criterion->target . ':' . $preparedValue;
            } else {
                $queries[] = $criterion->target . ':"' . $preparedValue . '"';
            }
        }

        return '(' . implode(' OR ', $queries) . ')';
    }
Map field value to a proper Solr representation.

@param \eZ\Publish\API\Repository\Values\Content\Query\Criterion $criterion
@param \EzSystems\EzPlatformSolrSearchEngine\Query\CriterionVisitor $subVisitor

@return string