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I'm getting the error 'Call to a member function addWhere() on array' in my hook. Any thoughts? I just need to add WHERE clause to my query.

use Drupal\views\ViewExecutable;
use Drupal\views\Plugin\views\query\QueryPluginBase;

/**
 * Implementation of hook_views_query_alter
 *
 * @param $view
 * @param $query
 */   
function MYMODULE_views_query_alter(ViewExecutable $view, QueryPluginBase $query) {
  if ($view->id() == 'search_filter' && $view->getDisplay()->display['id'] == 'block_1') {
    $field = 'node__field_country.field_country_target_id';
    $value = 'somevalue';
    $operator = '=';
    $query->addWhere(0, $field, $value, $operator);
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Try to add your condition to conditions array in the where $query->where like the following:

/**
 * Implements hook_views_query_alter().
 */
function myModule_views_query_alter(ViewExecutable $view, QueryPluginBase $query) {
  if ($view->id() === 'search_filter' && $view->current_display === 'block_1') {
    $field = 'node__field_country.field_country_target_id';
    $value = 'someValue';
    $operator = '=';
    if (isset($query->where[1]['conditions'])) {
      $query->where[1]['conditions'][] = [
        "field"    => $field,
        "value"    => $value,
        "operator" => $operator,
      ];
    }
  }
}

Read this Article it's very useful.

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