Where in the Metabase source code can I find the function that adds quotes to variables?

I am interested in understanding the underlying principle behind Metabase's use of quotations for variables, but I am uncertain as to where I can locate the function responsible for this behavior.

Hi, quotes or brackets?

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quotes

You want to know why Metabase sends the queries to the db with single quotes where there’s a parameter in the query. That’s for sure on the query processor

I want to know which part of the function in the source code is doing this.