tablestore/src/main/java/com/alicloud/openservices/tablestore/model/PlainBufferBlockRowIterator.java [61:78]:
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    public boolean hasNext() {
        // has data in buffer
        if (isBufferHasMoreData()) {
            return true;
        }

        // need to send one more request
        PrimaryKey nextToken = result.getNextStartPrimaryKey();
        while (nextToken != null && !nextToken.isEmpty()) {
            fetchData(buildRequest());
            if (isBufferHasMoreData()) {
                return true;
            }
            nextToken = result.getNextStartPrimaryKey();
        }

        return false;
    }
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tablestore/src/main/java/com/alicloud/openservices/tablestore/model/SimpleRowMatrixBlockRowIterator.java [96:113]:
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    public boolean hasNext() {
        // has data in buffer
        if (isBufferHasMoreData()) {
            return true;
        }

        // need to send one more request
        PrimaryKey nextToken = result.getNextStartPrimaryKey();
        while (nextToken != null && !nextToken.isEmpty()) {
            fetchData(buildRequest());
            if (isBufferHasMoreData()) {
                return true;
            }
            nextToken = result.getNextStartPrimaryKey();
        }

        return false;
    }
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