Add Expression for Entity Query

Question

I've been working with the entityQuery to query the db and get an array of filtered nids however I need to add an expression to my query.

I've checked the Query class and found a protected sqlQuery attribute that has access to addExpression(). In my case I'm not extending the class but rather instantiating it through \Drupal::entityQuery('node').

Also after checking a bit I found that the Select class has a function addExpression() that does exactly what I need, but then I lose the entityQuery and has to addJoin/addField and so on for each of the fields I would like to include in my conditions.

My objective:

$expression = "
    (
        6371000
        * acos(
            cos( radians({$latitude}) )
            * cos( radians( {$latitudeField} ) )
            * cos(
                radians( {$longitudeField} )
                - radians({$longitude})
            )
            + sin( radians({$latitude}) )
            * sin( radians( {$latitudeField} ) )
        )
    )";
$query = \Drupal::entityQuery('node')
->condition('status', 1)
->condition(`field_city`,1,'=')
->addExpression($expression, 'distance');

$nids = $query->execute();

Did I miss something ? Is there any other way to achieve what I want ?

EDIT: I found this approach but doesn't seem straight forward

EDIT2: Better approach is this

Answer 1

I am not sure if following is what you're looking for, it helped me when I was doing something similar

    $sql_snippet = <<<EOF

ROUND(
  CASE $this->tableAlias.$unit_column
    WHEN 'kg' THEN $this->tableAlias.$this->realField * :kg_coefficient
    WHEN 'lb' THEN $this->tableAlias.$this->realField * :lb_coefficient
  END
, :precision) = :value
EOF;

    // The difference in this invocation of ::addWhereExpression() compared to
    // the invocation in the filter handler is that here part of the DB
    // placeholders come from $this->options (such as precision) and others come
    // from the actual argument we have received, i.e. derived from
    // $this->argument.
    $this->query->addWhereExpression(0, $sql_snippet, [
      ':value' => round($arg['value'], $this->options['precision']),
      ':kg_coefficient' => $kg_coefficient,
      ':lb_coefficient' => $lb_coefficient,
      ':precision' => $this->options['precision'],
    ]);
  }

Lifted from Here