storm-client/src/jvm/org/apache/storm/trident/operation/impl/JoinerMultiReducer.java [124:137]:
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    private boolean increment(List[] lengths, int[] indices, int j, int overrideIndex) {
        if (j == -1) {
            return false;
        }
        if (j == overrideIndex) {
            return increment(lengths, indices, j - 1, overrideIndex);
        }
        indices[j]++;
        if (indices[j] >= lengths[j].size()) {
            indices[j] = 0;
            return increment(lengths, indices, j - 1, overrideIndex);
        }
        return true;
    }
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storm-client/src/jvm/org/apache/storm/trident/operation/impl/PreservingFieldsOrderJoinerMultiReducer.java [156:169]:
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    private boolean increment(List[] lengths, int[] indices, int j, int overrideIndex) {
        if (j == -1) {
            return false;
        }
        if (j == overrideIndex) {
            return increment(lengths, indices, j - 1, overrideIndex);
        }
        indices[j]++;
        if (indices[j] >= lengths[j].size()) {
            indices[j] = 0;
            return increment(lengths, indices, j - 1, overrideIndex);
        }
        return true;
    }
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