Simplify OPA Policy partial evaluation AST result

[t83714]

Simplify OPA Policy partial evaluation AST result

Right now an expression idList[_] = x (assume x is unknown and idList = [1,2,3] ), OPA might generate 3 rules:

{ x = 1 }
{ x = 2 }
{ x = 3 }

We might want to look at if the new in operator can help to reduce the number of rules to one rule { x in [1,2,3] } (and we can handle in operator in our parser accordingly).

We can translate in operator into in SQL operator or elasticsearch terms query

Relevant:

• OPA AST parser takes too long to evaluate large response #3340