hyracks/hyracks-storage-am-btree/src/main/java/org/apache/hyracks/storage/am/btree/frames/BTreeNSMLeafFrame.java [284:301]:
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    public void validate(PageValidationInfo pvi) throws HyracksDataException {
        int tupleCount = getTupleCount();
        for (int i = 0; i < tupleCount; i++) {
            frameTuple.resetByTupleIndex(this, i);
            if (!pvi.isLowRangeNull) {
                assert cmp.compare(pvi.lowRangeTuple, frameTuple) < 0;
            }

            if (!pvi.isHighRangeNull) {
                assert cmp.compare(pvi.highRangeTuple, frameTuple) >= 0;
            }

            if (i > 0) {
                previousFt.resetByTupleIndex(this, i - 1);
                assert cmp.compare(previousFt, frameTuple) < 0;
            }
        }
    }
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hyracks/hyracks-storage-am-btree/src/main/java/org/apache/hyracks/storage/am/btree/frames/BTreeNSMInteriorFrame.java [449:466]:
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    public void validate(PageValidationInfo pvi) throws HyracksDataException {
        int tupleCount = getTupleCount();
        for (int i = 0; i < tupleCount; i++) {
            frameTuple.resetByTupleIndex(this, i);
            if (!pvi.isLowRangeNull) {
                assert cmp.compare(pvi.lowRangeTuple, frameTuple) < 0;
            }

            if (!pvi.isHighRangeNull) {
                assert cmp.compare(pvi.highRangeTuple, frameTuple) >= 0;
            }

            if (i > 0) {
                previousFt.resetByTupleIndex(this, i - 1);
                assert cmp.compare(previousFt, frameTuple) < 0;
            }
        }
    }
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