left = addDistinctProjectionOp(left, ctx, node, projectInVars);
left = addDistinctProjectionOp(left, ctx, node, projectInVars);
addDistinctProjectionOp(null, ctx, subqueryRoot, subqueryProjVars);
addDistinctProjectionOp(null, ctx, subqueryRoot, subqueryProjVars);