Examples with Index org.h2.index.Index used on opensource projects

Example 71 with Index

use of org.h2.index.Index in project h2database by h2database.

the class ResultTempTable method createIndex.

private void createIndex() {
    IndexColumn[] indexCols = null;
    // sort columns. So we need to disregard the sort. Not ideal.
    if (sort != null && !distinct) {
        int[] colIndex = sort.getQueryColumnIndexes();
        indexCols = new IndexColumn[colIndex.length];
        for (int i = 0; i < colIndex.length; i++) {
            IndexColumn indexColumn = new IndexColumn();
            indexColumn.column = table.getColumn(colIndex[i]);
            indexColumn.sortType = sort.getSortTypes()[i];
            indexColumn.columnName = COLUMN_NAME + i;
            indexCols[i] = indexColumn;
        }
    } else {
        indexCols = new IndexColumn[columnCount];
        for (int i = 0; i < columnCount; i++) {
            IndexColumn indexColumn = new IndexColumn();
            indexColumn.column = table.getColumn(i);
            indexColumn.columnName = COLUMN_NAME + i;
            indexCols[i] = indexColumn;
        }
    }
    String indexName = table.getSchema().getUniqueIndexName(session, table, Constants.PREFIX_INDEX);
    int indexId = session.getDatabase().allocateObjectId();
    IndexType indexType = IndexType.createNonUnique(true);
    index = table.addIndex(session, indexName, indexId, indexCols, indexType, true, null);
}

Example 72 with Index

use of org.h2.index.Index in project h2database by h2database.

the class SortOrder method getColumn.

/**
 * Get the column for the given table filter, if the sort column is for this
 * filter.
 *
 * @param index the column index (0, 1,..)
 * @param filter the table filter
 * @return the column, or null
 */
public Column getColumn(int index, TableFilter filter) {
    if (orderList == null) {
        return null;
    }
    SelectOrderBy order = orderList.get(index);
    Expression expr = order.expression;
    if (expr == null) {
        return null;
    }
    expr = expr.getNonAliasExpression();
    if (expr.isConstant()) {
        return null;
    }
    if (!(expr instanceof ExpressionColumn)) {
        return null;
    }
    ExpressionColumn exprCol = (ExpressionColumn) expr;
    if (exprCol.getTableFilter() != filter) {
        return null;
    }
    return exprCol.getColumn();
}

Example 73 with Index

use of org.h2.index.Index in project h2database by h2database.

the class Page method setValue.

/**
 * Replace the value at an index in this page.
 *
 * @param index the index
 * @param value the new value
 * @return the old value
 */
public Object setValue(int index, Object value) {
    Object old = values[index];
    // this is slightly slower:
    // values = Arrays.copyOf(values, values.length);
    values = values.clone();
    DataType valueType = map.getValueType();
    if (isPersistent()) {
        addMemory(valueType.getMemory(value) - valueType.getMemory(old));
    }
    values[index] = value;
    return old;
}

Example 74 with Index

use of org.h2.index.Index in project h2database by h2database.

the class Page method setKey.

/**
 * Replace the key at an index in this page.
 *
 * @param index the index
 * @param key the new key
 */
public void setKey(int index, Object key) {
    // this is slightly slower:
    // keys = Arrays.copyOf(keys, keys.length);
    keys = keys.clone();
    if (isPersistent()) {
        Object old = keys[index];
        DataType keyType = map.getKeyType();
        int mem = keyType.getMemory(key);
        if (old != null) {
            mem -= keyType.getMemory(old);
        }
        addMemory(mem);
    }
    keys[index] = key;
}

Example 75 with Index

use of org.h2.index.Index in project h2database by h2database.

the class TestPerfectHash method testBrokenHashFunction.

private void testBrokenHashFunction() {
    int size = 10000;
    Random r = new Random(10000);
    HashSet<String> set = new HashSet<>(size);
    while (set.size() < size) {
        set.add("x " + r.nextDouble());
    }
    for (int test = 1; test < 10; test++) {
        final int badUntilLevel = test;
        UniversalHash<String> badHash = new UniversalHash<String>() {

            @Override
            public int hashCode(String o, int index, int seed) {
                if (index < badUntilLevel) {
                    return 0;
                }
                return StringHash.getFastHash(o, index, seed);
            }
        };
        byte[] desc = MinimalPerfectHash.generate(set, badHash);
        testMinimal(desc, set, badHash);
    }
}