hyracks/hyracks-storage-am-lsm-rtree/src/main/java/org/apache/hyracks/storage/am/lsm/rtree/impls/AbstractLSMRTree.java [334:357]:
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    @Override
    public void modify(IIndexOperationContext ictx, ITupleReference tuple) throws HyracksDataException, IndexException {
        LSMRTreeOpContext ctx = (LSMRTreeOpContext) ictx;
        if (ctx.getOperation() == IndexOperation.PHYSICALDELETE) {
            throw new UnsupportedOperationException("Physical delete not supported in the LSM-RTree");
        }

        ITupleReference indexTuple;
        if (ctx.indexTuple != null) {
            ctx.indexTuple.reset(tuple);
            indexTuple = ctx.indexTuple;
        } else {
            indexTuple = tuple;
        }

        ctx.getModificationCallback().before(indexTuple);
        ctx.getModificationCallback().found(null, indexTuple);
        if (ctx.getOperation() == IndexOperation.INSERT) {
            ctx.currentMutableRTreeAccessor.insert(indexTuple);
        } else {
            // First remove all entries in the in-memory rtree (if any).
            ctx.currentMutableRTreeAccessor.delete(indexTuple);
            // Insert key into the deleted-keys BTree.
            try {
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hyracks/hyracks-storage-am-lsm-rtree/src/main/java/org/apache/hyracks/storage/am/lsm/rtree/impls/LSMRTree.java [480:502]:
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    @Override
    public void modify(IIndexOperationContext ictx, ITupleReference tuple) throws HyracksDataException, IndexException {
        LSMRTreeOpContext ctx = (LSMRTreeOpContext) ictx;
        if (ctx.getOperation() == IndexOperation.PHYSICALDELETE) {
            throw new UnsupportedOperationException("Physical delete not supported in the LSM-RTree");
        }

        ITupleReference indexTuple;
        if (ctx.indexTuple != null) {
            ctx.indexTuple.reset(tuple);
            indexTuple = ctx.indexTuple;
        } else {
            indexTuple = tuple;
        }

        ctx.getModificationCallback().before(indexTuple);
        ctx.getModificationCallback().found(null, indexTuple);
        if (ctx.getOperation() == IndexOperation.INSERT) {
            ctx.currentMutableRTreeAccessor.insert(indexTuple);
        } else {
            // First remove all entries in the in-memory rtree (if any).
            ctx.currentMutableRTreeAccessor.delete(indexTuple);
            try {
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