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What method should I use instead of DrupalCoreEntityQuerySqlQuery::addExpression()?

I am using Entity Query to select nodes of two different types. The fetching seems to be working, but I to sort the returned values. Both the content types have different date fields. I know I could do this with $query->addExpression('COALESCE( field_date_1, field_date_2)', 'Date'); $query->sort('Date', 'DESC'); but addExpression() isn’t an existing method, and the code throws this exception.

Error: Call to undefined method DrupalCoreEntityQuerySqlQuery::addExpression()

How can I sort on more than 2 date fields?

This article was republished from its original source.
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What method should I use instead of DrupalCoreEntityQuerySqlQuery::addExpression()?

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