src/DcGeneral/Data/FilterBuilderSql.php
public function build()
    {
        if (!$this->isEmpty()) {
            return new SimpleQuery(
                sprintf('SELECT id FROM %s WHERE %s', $this->tableName, $this->getProcedure()),
                $this->getParameters(),
                'id',
                $this->connection
            );
        }

        return null;
    }
public function build()
    {
        if (!$this->isEmpty()) {
            return new SimpleQuery(
                sprintf('SELECT id FROM %s WHERE %s', $this->tableName, $this->getProcedure()),
                $this->getParameters(),
                'id',
                $this->connection
            );
        }

        return null;
    }
Retrieve the filter rule if anything to filter.

@return SimpleQuery|null