Examples of com.foundationdb.server.api.dml.IndexRowPrefixSelector

com.foundationdb.server.api.dml.IndexRowPrefixSelector

        // Setup for row comparisons
        this.leftFixedFields = leftRowType.nFields() - leftOrderingFields;
        this.rightFixedFields = rightRowType.nFields() - rightOrderingFields;
        this.fieldsToCompare = ascending.length;
        // Setup for jumping
        leftSkipRowColumnSelector = new IndexRowPrefixSelector(leftFixedFields + fieldsToCompare);
        rightSkipRowColumnSelector = new IndexRowPrefixSelector(rightFixedFields + fieldsToCompare);
        ArgumentValidation.isTrue("comparisons", (comparisons == null) || (fieldsToCompare == comparisons.size()));
        this.comparisons = comparisons;
        this.outputEqual = outputEqual;
    }

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        /** Return a column selector that enables the first <code>nkeys</code> fields
         * of a row of the index's user table. */
        protected ColumnSelector getIndexColumnSelector(final Index index, 
                                                        final int nkeys) {
            assert nkeys <= index.getAllColumns().size() : index + " " + nkeys;
            return new IndexRowPrefixSelector(nkeys);
        }

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        Index index = keyRange.indexRowType().index();
        Space space = index.space();
        int latColumn = index.firstSpatialArgument();
        int lonColumn = latColumn + 1;
        // The index column selector needs to select all the columns before the z column, and the z column itself.
        IndexRowPrefixSelector indexColumnSelector = new IndexRowPrefixSelector(latColumn + 1);
        IndexBound loBound = keyRange.lo();
        ValueRecord loExpressions = loBound.boundExpressions(context, bindings);
        // Compute z-value at beginning of forward and backward scans
        TInstance latInstance = index.getAllColumns().get(latColumn).getColumn().getType();
        TInstance lonInstance = index.getAllColumns().get(lonColumn).getColumn().getType();

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        IndexRowType rowType = keyRange.indexRowType().physicalRowType();
        for (int f = 0; f < rowType.nFields(); f++) {
            zOrdering.append(new TPreparedField(rowType.typeAt(f), f), true);
        }
        // The index column selector needs to select all the columns before the z column, and the z column itself.
        this.indexColumnSelector = new IndexRowPrefixSelector(this.latColumn + 1);
        for (IndexKeyRange zKeyRange : zKeyRanges(context, keyRange)) {
            IterationHelper rowState = adapter.createIterationHelper(keyRange.indexRowType());


            IndexCursorUnidirectional<ValueSource> zIntervalCursor =
                new IndexCursorUnidirectional<>(context,

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