algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/physical/SortGroupByPOperator.java [82:91]:
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    private void computeColumnSet(List<Pair<LogicalVariable, Mutable<ILogicalExpression>>> gbyList) {
        columnSet.clear();
        for (Pair<LogicalVariable, Mutable<ILogicalExpression>> p : gbyList) {
            ILogicalExpression expr = p.second.getValue();
            if (expr.getExpressionTag() == LogicalExpressionTag.VARIABLE) {
                VariableReferenceExpression v = (VariableReferenceExpression) expr;
                columnSet.add(v.getVariableReference());
            }
        }
    }
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algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/physical/ExternalGroupByPOperator.java [84:93]:
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    public void computeColumnSet(List<Pair<LogicalVariable, Mutable<ILogicalExpression>>> gbyList) {
        columnSet.clear();
        for (Pair<LogicalVariable, Mutable<ILogicalExpression>> p : gbyList) {
            ILogicalExpression expr = p.second.getValue();
            if (expr.getExpressionTag() == LogicalExpressionTag.VARIABLE) {
                VariableReferenceExpression v = (VariableReferenceExpression) expr;
                columnSet.add(v.getVariableReference());
            }
        }
    }
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