hyracks/hyracks-storage-am-btree/src/main/java/org/apache/hyracks/storage/am/btree/impls/BTreeRangeSearchCursor.java [212:227]:
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    private int getLowKeyIndex() throws HyracksDataException {
        if (lowKey == null) {
            return 0;
        }

        int index = frame.findTupleIndex(lowKey, frameTuple, lowKeyCmp, lowKeyFtm, lowKeyFtp);
        if (pred.lowKeyInclusive) {
            index++;
        } else {
            if (index < 0) {
                index = frame.getTupleCount();
            }
        }

        return index;
    }
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hyracks/hyracks-storage-am-btree/src/main/java/org/apache/hyracks/storage/am/btree/impls/BTreeCountingSearchCursor.java [138:151]:
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    private int getLowKeyIndex() throws HyracksDataException {
        if (lowKey == null) {
            return 0;
        }
        int index = frame.findTupleIndex(lowKey, frameTuple, lowKeyCmp, lowKeyFtm, lowKeyFtp);
        if (pred.lowKeyInclusive) {
            index++;
        } else {
            if (index < 0) {
                index = frame.getTupleCount();
            }
        }
        return index;
    }
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