>  Real support for using variables as identifiers / nothing restricted to
> only accepting a Const.

This point is problematic not only from performance perspective.

if you don't use some special syntax and you allow variables as identifier,
then you will got a ambiguous situation quickly - although variables can
have special symbol prefix

SELECT * FROM tab WHERE $var1 = $var3

What is $var1, what is $var2? identifier or value?



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