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

com.foundationdb.server.api.dml.ColumnSelector
Specifies a subset of a table's columns.

        for (int i = 0; i < nkeys; i++) {
            pexprs.add(new TPreparedParameter(i, indexType.typeAt(i)));
        }
        IndexBound bound = 
            new IndexBound(new RowBasedUnboundExpressions(indexType, pexprs),
                           new ColumnSelector() {
                               @Override
                               public boolean includesColumn(int columnPosition) {
                                   return columnPosition < nkeys;
                               }
                           });

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    }


    protected ColumnSelector columnSelector(final Index index)
    {
        final int columnCount = index.getKeyColumns().size();
        return new ColumnSelector() {
            @Override
            public boolean includesColumn(int columnPosition) {
                return columnPosition < columnCount;
            }
        };

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        this.indexKind = indexKeyRange.indexKind;
    }


    private static int boundColumns(IndexRowType indexRowType, IndexBound lo, IndexBound hi)
    {
        ColumnSelector loSelector = lo.columnSelector();
        ColumnSelector hiSelector = hi.columnSelector();
        boolean selected = true;
        int boundColumns = 0;
        for (int i = 0; i < indexRowType.nFields(); i++) {
            if (loSelector.includesColumn(i) != hiSelector.includesColumn(i)) {
                throw new IllegalArgumentException(
                    String.format("IndexBound arguments specify different fields of index %s", indexRowType));
            }
            if (selected) {
                // loSelector.includesColumn(i) will equal hiSelector.includesColumn(i) for non-lexicographic
                // ranges. For lexicographic, we want boundColumns to indicate the maximum value, relying on
                // SortCursorUnidirectionalLexicographic to take care of the shorter one.
                if (loSelector.includesColumn(i) || hiSelector.includesColumn(i)) {
                    boundColumns++;
                } else {
                    selected = false;
                }
            } else {

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        return boundColumns;
    }


    private static int boundColumns(IndexRowType indexRowType, IndexBound bound)
    {
        ColumnSelector selector = bound.columnSelector();
        boolean selected = true;
        int boundColumns = 0;
        for (int i = 0; i < indexRowType.nFields(); i++) {
            if (selected) {
                if (selector.includesColumn(i)) {
                    boundColumns++;
                } else {
                    selected = false;
                }
            } else {
                if (selector.includesColumn(i)) {
                    throw new IllegalArgumentException(
                        String.format("IndexBound arguments for index %s specify non-leading fields", indexRowType));
                }
            }
        }

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Related Classes of com.foundationdb.server.api.dml.ColumnSelector

com.foundationdb.qp.expression.IndexKeyRange

com.foundationdb.server.test.it.qp.OperatorITBase

com.foundationdb.sql.optimizer.rule.PlanGenerator

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