Power BI Desktop Bind Variables in Oracle Queries

Hi,

I have found how to use parameter in query, like this:

let
Source = Oracle.Database("SYNCDWP", [Query="SELECT MGROUP,COL2,COL3 #(lf) FROM MY_BIG_TABLE#(lf)WHERE MGROUP = '"&PAR_GROUP&"'", HierarchicalNavigation=true])
in
Source

The Power BI replaces the parameter PAR_GROUP with the value and executes the query.

1. First problem is, that  for every new parameter value I have to give permission for executing.

2. The second is, that is not bind variable used in Oracle, but constant. In this way, Oracle will parse the query again and again

for every new parameter value and there will be a different execution plan as in the case of bind variable using.

Did I use the parameters in the wrong way?

Is there a way to use real bind variables with Oracle queries?

Where can I find more about the language (and functions) used in Advanced Editor?

Best Regards