Overview

Sort rows by inserting them into a {@link TreeMap} and then reading them out in order.

Behavior

The rows of the input stream are written into a map that orders rows according to the ordering specification. Once the input stream has been consumed, the map is iterated from beginning to end to provide rows of the output stream.

Performance

MemorySorter generates no IO.

Memory Requirements

Memory requirements are dependent on the size of the input stream. One Key is generated for each Row and each Row is copied to be held in memory. All rows from the input stream are held until close.

                               Cursor input,
                               RowType rowType,
                               API.Ordering ordering,
                               API.SortOption sortOption,
                               InOutTap loadTap) {
        return new MemorySorter(context, bindings, input, rowType, ordering, sortOption, loadTap, store().createKey());
    }

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Examples of MemorySorter

Overview

Behavior

Performance

Memory Requirements

Examples of com.foundationdb.qp.storeadapter.indexcursor.MemorySorter