Question

Point out the wrong statement.

(a) { $meta: “textScore” } expression is only meaningful in a pipeline that includes a $match stage with a $text query

(b) The { $meta: “textScore” } expression is the only expression that the $sort stage accepts

(c) $toLower only has a well-defined behavior for strings of ASCII characters

(d) None of the mentioned

I had been asked this question during an interview.

Question is from Pipeline and Sharded Collections topic in portion Aggregation Concepts and Aggregation Mechanics of MongoDB

Answer 1

Right option is (d) None of the mentioned

Explanation: A $meta expression has the following syntax:{ $meta: <metaDataKeyword> }.