wayang-commons/wayang-core/src/main/java/org/apache/wayang/core/optimizer/costs/LoadProfileEstimators.java [412:435]:
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                                             final long[] inputCardinalities,
                                             final long[] outputCardinalities) {
        return new Context() {
            @Override
            public double getVariable(String variableName) throws EvaluationException {
                // Serve "in999" and "out999" variables directly from the cardinality arrays.
                if (variableName.startsWith("in") && variableName.length() > 2) {
                    int accu = 0;
                    int i;
                    for (i = 2; i < variableName.length(); i++) {
                        char c = variableName.charAt(i);
                        if (!Character.isDigit(c)) break;
                        accu = 10 * accu + (c - '0');
                    }
                    if (i == variableName.length()) return inputCardinalities[accu];
                } else if (variableName.startsWith("out") && variableName.length() > 3) {
                    int accu = 0;
                    int i;
                    for (i = 3; i < variableName.length(); i++) {
                        char c = variableName.charAt(i);
                        if (!Character.isDigit(c)) break;
                        accu = 10 * accu + (c - '0');
                    }
                    if (i == variableName.length()) return outputCardinalities[accu];
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wayang-profiler/src/main/java/org/apache/wayang/profiler/log/DynamicLoadEstimator.java [133:156]:
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                                             final long[] inputCardinalities,
                                             final long[] outputCardinalities) {
        return new Context() {
            @Override
            public double getVariable(String variableName) throws EvaluationException {
                // Serve "in999" and "out999" variables directly from the cardinality arrays.
                if (variableName.startsWith("in") && variableName.length() > 2) {
                    int accu = 0;
                    int i;
                    for (i = 2; i < variableName.length(); i++) {
                        char c = variableName.charAt(i);
                        if (!Character.isDigit(c)) break;
                        accu = 10 * accu + (c - '0');
                    }
                    if (i == variableName.length()) return inputCardinalities[accu];
                } else if (variableName.startsWith("out") && variableName.length() > 3) {
                    int accu = 0;
                    int i;
                    for (i = 3; i < variableName.length(); i++) {
                        char c = variableName.charAt(i);
                        if (!Character.isDigit(c)) break;
                        accu = 10 * accu + (c - '0');
                    }
                    if (i == variableName.length()) return outputCardinalities[accu];
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