branch-4.0: [fix](agg push down) guard Count(*) child access with arity() check in PushDownAggThroughJoinOnPkFk #64848 - #64950

branch-4.0: [fix](agg push down) guard Count(*) child access with arity() check in PushDownAggThroughJoinOnPkFk #64848#64950

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