Re: CTE, lateral or jsonb_object_agg ?

Hi. Maybe I'm missing something, but why aren't you simply doing:

    select name, varvalue from sys_var where name = any($1)

and binding your 4 (in your examples) or 10 or 1 name(s) as a text array (i.e. text[])?

With a prepared statement you plan only once.

You can also avoid selecting names by unnest'ing the text-array with ordinality

and join+sort on it, to get the values in name order (i.e. same order as $1 you control).

See my recent thread where I learned about that technique.

Generating SQL text dynamically when you can avoid it with proper binding

and appropriate SQL is leaving performance on the table IMHO. --DD