Issue #3239548 by JordiK: Views pager ignores group aggregation

      '#title' => $this->t('Column aggregation row applies to'),

      '#type' => 'radios',

      '#options' => [

        1 => $this->t('the page shown, if a pager is enabled'),

        0 => $this->t('the entire result set (CAUTION: To enable this, create a copy of this view display, disable the pager there, set the <i>machine name</i> to <i>DISPLAY_NAME_no_pager</i> (e.g. page_1_no_pager) and give it a different path.)'),

        0 => $this->t('the entire result set <em>CAUTION: This could cause performance issues with large tables!</em>'),

        1 => $this->t('the page shown (if pager enabled) or the result subset (if offset defined)'),

      ],

      '#description' => $this->t('If your view does not have a pager, then the two options are equivalent.'),

      '#description' => $this->t('If your view does not have a pager or offset, then the two options are equivalent (whole resultset).'),

      '#default_value' => $this->options['column_aggregation']['totals_per_page'],

      '#weight' => 1,

    ];

      return;

    }

    $functions = $this->collectAggregationFunctions();

    $show_global_totals_with_pager = empty($this->options['column_aggregation']['totals_per_page']) && !empty($this->view->total_rows);

    if ($show_global_totals_with_pager) {

    $global_totals = $this->options['column_aggregation']['totals_per_page'];

    $pager = $this->view->display_handler->getOption('pager');

    $with_pager = ($pager['type'] != 'none' || ($pager['type'] == 'none' && $pager['options']['offset'] > 0)) ? TRUE : FALSE;

    $show_global_totals_with_pager = empty($global_totals) && $with_pager == TRUE;

    // If totals based on all rows and pager is set - get the whole resultset.

    if ($show_global_totals_with_pager && !empty($this->view->total_rows)) {

      $this->view->is_temp_views_aggregator = TRUE;

      $args = $this->view->args;

      $display_id = $this->view->current_display;

      $view_displays = $this->view->displayHandlers->getInstanceIds();

      if (in_array($display_id . '_no_pager', $view_displays)) {

      $clone = $this->view->createDuplicate();

      $clone->is_temp_views_aggregator = TRUE;

        $clone->executeDisplay($display_id . '_no_pager', $args);

      // Remove any paging and offsets and execute the display.

      $clone->setItemsPerPage(0);

      $clone->setOffset(0);

      $clone->executeDisplay($display_id, $args);

      // First apply the row filters (if any), then aggregate the columns.

      // Only interested in column aggregation, so only 'column' group needed.

      $clone->postExecute();

      $clone->destroy();

    }

    }

    // Because we are going to need the View results AFTER token replacement,

    // we render the result set here. This is NOT duplication of CPU time,

    // because self::renderFields(), if called for a second time, will do

    // Apply the row filters first, then aggregate the groups.

    $this->applyRowFilters();

    $groups = $this->aggregateGroups();

    $with_pager = FALSE;

    $values = $this->executeAggregationFunctions($groups, $functions);

    unset($groups['column']);

    // Set the totals after eventual sorting has finished.

    if (empty($this->view->totals)) {

      // If not already set above, write the column aggregation result row on

      // the View object. This row will be rendered via

      // template_preprocess_views_aggregator_results_table().

      $this->view->totals = $this->setTotalsRow($values);

    }

    // If we have a pager enabled with option set to show total

    // for whole resultset insteead of page - overwrite the

    // page totals as last step.

      if (isset($totals)) {

        $this->view->totals = $this->setTotalsRow($totals);

      }

    // Aggregate the results per group and show them in a separate row,

    // without compression.

      else {

        $this->view->totals = $this->setTotalsRow($values);

      }

    }

    // Aggregate group results and show them in a separate row, no compression.

    if ($group_aggregation_results == 1) {

      $this->setAggregatedGroupValues($groups, $values, $group_aggregation_results);

    }