Examples with IndexRowGenerator org.apache.derby.iapi.sql.dictionary.IndexRowGenerator used on opensource projects

Example 11 with IndexRowGenerator

use of org.apache.derby.iapi.sql.dictionary.IndexRowGenerator in project derby by apache.

the class CreateIndexConstantAction method executeConstantAction.

// INTERFACE METHODS
/**
 *	This is the guts of the Execution-time logic for
 *  creating an index.
 *
 *  <P>
 *  A index is represented as:
 *  <UL>
 *  <LI> ConglomerateDescriptor.
 *  </UL>
 *  No dependencies are created.
 *
 *  @see ConglomerateDescriptor
 *  @see SchemaDescriptor
 *	@see ConstantAction#executeConstantAction
 *
 * @exception StandardException		Thrown on failure
 */
public void executeConstantAction(Activation activation) throws StandardException {
    TableDescriptor td;
    UUID toid;
    ColumnDescriptor columnDescriptor;
    int[] baseColumnPositions;
    IndexRowGenerator indexRowGenerator = null;
    ExecRow[] baseRows;
    ExecIndexRow[] indexRows;
    ExecRow[] compactBaseRows;
    GroupFetchScanController scan;
    RowLocationRetRowSource rowSource;
    long sortId;
    int maxBaseColumnPosition = -1;
    LanguageConnectionContext lcc = activation.getLanguageConnectionContext();
    DataDictionary dd = lcc.getDataDictionary();
    DependencyManager dm = dd.getDependencyManager();
    TransactionController tc = lcc.getTransactionExecute();
    /*
		** Inform the data dictionary that we are about to write to it.
		** There are several calls to data dictionary "get" methods here
		** that might be done in "read" mode in the data dictionary, but
		** it seemed safer to do this whole operation in "write" mode.
		**
		** We tell the data dictionary we're done writing at the end of
		** the transaction.
		*/
    dd.startWriting(lcc);
    /*
		** If the schema descriptor is null, then
		** we must have just read ourselves in.  
		** So we will get the corresponding schema
		** descriptor from the data dictionary.
		*/
    SchemaDescriptor sd = dd.getSchemaDescriptor(schemaName, tc, true);
    /* Get the table descriptor. */
    /* See if we can get the TableDescriptor 
		 * from the Activation.  (Will be there
		 * for backing indexes.)
		 */
    td = activation.getDDLTableDescriptor();
    if (td == null) {
        /* tableId will be non-null if adding an index to
			 * an existing table (as opposed to creating a
			 * table with a constraint with a backing index).
			 */
        if (tableId != null) {
            td = dd.getTableDescriptor(tableId);
        } else {
            td = dd.getTableDescriptor(tableName, sd, tc);
        }
    }
    if (td == null) {
        throw StandardException.newException(SQLState.LANG_CREATE_INDEX_NO_TABLE, indexName, tableName);
    }
    if (td.getTableType() == TableDescriptor.SYSTEM_TABLE_TYPE) {
        throw StandardException.newException(SQLState.LANG_CREATE_SYSTEM_INDEX_ATTEMPTED, indexName, tableName);
    }
    /* Get a shared table lock on the table. We need to lock table before
		 * invalidate dependents, otherwise, we may interfere with the
		 * compilation/re-compilation of DML/DDL.  See beetle 4325 and $WS/
		 * docs/language/SolutionsToConcurrencyIssues.txt (point f).
		 */
    lockTableForDDL(tc, td.getHeapConglomerateId(), false);
    // depended on this table (including this one)
    if (!forCreateTable) {
        dm.invalidateFor(td, DependencyManager.CREATE_INDEX, lcc);
    }
    // Translate the base column names to column positions
    baseColumnPositions = new int[columnNames.length];
    for (int i = 0; i < columnNames.length; i++) {
        // Look up the column in the data dictionary
        columnDescriptor = td.getColumnDescriptor(columnNames[i]);
        if (columnDescriptor == null) {
            throw StandardException.newException(SQLState.LANG_COLUMN_NOT_FOUND_IN_TABLE, columnNames[i], tableName);
        }
        TypeId typeId = columnDescriptor.getType().getTypeId();
        // Don't allow a column to be created on a non-orderable type
        ClassFactory cf = lcc.getLanguageConnectionFactory().getClassFactory();
        boolean isIndexable = typeId.orderable(cf);
        if (isIndexable && typeId.userType()) {
            String userClass = typeId.getCorrespondingJavaTypeName();
            // run the compare method.
            try {
                if (cf.isApplicationClass(cf.loadApplicationClass(userClass)))
                    isIndexable = false;
            } catch (ClassNotFoundException cnfe) {
                // shouldn't happen as we just check the class is orderable
                isIndexable = false;
            }
        }
        if (!isIndexable) {
            throw StandardException.newException(SQLState.LANG_COLUMN_NOT_ORDERABLE_DURING_EXECUTION, typeId.getSQLTypeName());
        }
        // Remember the position in the base table of each column
        baseColumnPositions[i] = columnDescriptor.getPosition();
        if (maxBaseColumnPosition < baseColumnPositions[i])
            maxBaseColumnPosition = baseColumnPositions[i];
    }
    /* The code below tries to determine if the index that we're about
		 * to create can "share" a conglomerate with an existing index.
		 * If so, we will use a single physical conglomerate--namely, the
		 * one that already exists--to support both indexes. I.e. we will
		 * *not* create a new conglomerate as part of this constant action.
         *
         * Deferrable constraints are backed by indexes that are *not* shared
         * since they use physically non-unique indexes and as such are
         * different from indexes used to represent non-deferrable
         * constraints.
		 */
    // check if we have similar indices already for this table
    ConglomerateDescriptor[] congDescs = td.getConglomerateDescriptors();
    boolean shareExisting = false;
    for (int i = 0; i < congDescs.length; i++) {
        ConglomerateDescriptor cd = congDescs[i];
        if (!cd.isIndex())
            continue;
        if (droppedConglomNum == cd.getConglomerateNumber()) {
            /* We can't share with any conglomerate descriptor
				 * whose conglomerate number matches the dropped
				 * conglomerate number, because that descriptor's
				 * backing conglomerate was dropped, as well.  If
				 * we're going to share, we have to share with a
				 * descriptor whose backing physical conglomerate
				 * is still around.
				 */
            continue;
        }
        IndexRowGenerator irg = cd.getIndexDescriptor();
        int[] bcps = irg.baseColumnPositions();
        boolean[] ia = irg.isAscending();
        int j = 0;
        /* The conditions which allow an index to share an existing
			 * conglomerate are as follows:
			 *
			 * 1. the set of columns (both key and include columns) and their 
			 *  order in the index is the same as that of an existing index AND 
			 *
			 * 2. the ordering attributes are the same AND 
			 *
			 * 3. one of the following is true:
			 *    a) the existing index is unique, OR
			 *    b) the existing index is non-unique with uniqueWhenNotNulls
			 *       set to TRUE and the index being created is non-unique, OR
			 *    c) both the existing index and the one being created are
			 *       non-unique and have uniqueWithDuplicateNulls set to FALSE.
             *
             * 4. hasDeferrableChecking is FALSE.
             */
        boolean possibleShare = (irg.isUnique() || !unique) && (bcps.length == baseColumnPositions.length) && !hasDeferrableChecking;
        // is set to true (backing index for unique constraint)
        if (possibleShare && !irg.isUnique()) {
            /* If the existing index has uniqueWithDuplicateNulls set to
				 * TRUE it can be shared by other non-unique indexes; otherwise
				 * the existing non-unique index has uniqueWithDuplicateNulls
				 * set to FALSE, which means the new non-unique conglomerate
				 * can only share if it has uniqueWithDuplicateNulls set to
				 * FALSE, as well.
				 */
            possibleShare = (irg.isUniqueWithDuplicateNulls() || !uniqueWithDuplicateNulls);
        }
        if (possibleShare && indexType.equals(irg.indexType())) {
            for (; j < bcps.length; j++) {
                if ((bcps[j] != baseColumnPositions[j]) || (ia[j] != isAscending[j]))
                    break;
            }
        }
        if (// share
        j == baseColumnPositions.length) {
            /*
				 * Don't allow users to create a duplicate index. Allow if being done internally
				 * for a constraint
				 */
            if (!isConstraint) {
                activation.addWarning(StandardException.newWarning(SQLState.LANG_INDEX_DUPLICATE, indexName, cd.getConglomerateName()));
                return;
            }
            /* Sharing indexes share the physical conglomerate
				 * underneath, so pull the conglomerate number from
				 * the existing conglomerate descriptor.
				 */
            conglomId = cd.getConglomerateNumber();
            /* We create a new IndexRowGenerator because certain
				 * attributes--esp. uniqueness--may be different between
				 * the index we're creating and the conglomerate that
				 * already exists.  I.e. even though we're sharing a
				 * conglomerate, the new index is not necessarily
				 * identical to the existing conglomerate. We have to
				 * keep track of that info so that if we later drop
				 * the shared physical conglomerate, we can figure out
				 * what this index (the one we're creating now) is
				 * really supposed to look like.
				 */
            indexRowGenerator = new IndexRowGenerator(indexType, unique, uniqueWithDuplicateNulls, // uniqueDeferrable
            false, // deferrable indexes are not shared
            false, baseColumnPositions, isAscending, baseColumnPositions.length);
            // DERBY-655 and DERBY-1343
            // Sharing indexes will have unique logical conglomerate UUIDs.
            conglomerateUUID = dd.getUUIDFactory().createUUID();
            shareExisting = true;
            break;
        }
    }
    /* If we have a droppedConglomNum then the index we're about to
		 * "create" already exists--i.e. it has an index descriptor and
		 * the corresponding information is already in the system catalogs.
		 * The only thing we're missing, then, is the physical conglomerate
		 * to back the index (because the old conglomerate was dropped).
		 */
    boolean alreadyHaveConglomDescriptor = (droppedConglomNum > -1L);
    /* If this index already has an essentially same one, we share the
		 * conglomerate with the old one, and just simply add a descriptor
		 * entry into SYSCONGLOMERATES--unless we already have a descriptor,
		 * in which case we don't even need to do that.
		 */
    DataDescriptorGenerator ddg = dd.getDataDescriptorGenerator();
    if (shareExisting && !alreadyHaveConglomDescriptor) {
        ConglomerateDescriptor cgd = ddg.newConglomerateDescriptor(conglomId, indexName, true, indexRowGenerator, isConstraint, conglomerateUUID, td.getUUID(), sd.getUUID());
        dd.addDescriptor(cgd, sd, DataDictionary.SYSCONGLOMERATES_CATALOG_NUM, false, tc);
        // add newly added conglomerate to the list of conglomerate
        // descriptors in the td.
        ConglomerateDescriptorList cdl = td.getConglomerateDescriptorList();
        cdl.add(cgd);
    // can't just return yet, need to get member "indexTemplateRow"
    // because create constraint may use it
    }
    // Describe the properties of the index to the store using Properties
    // RESOLVE: The following properties assume a BTREE index.
    Properties indexProperties;
    if (properties != null) {
        indexProperties = properties;
    } else {
        indexProperties = new Properties();
    }
    // Tell it the conglomerate id of the base table
    indexProperties.put("baseConglomerateId", Long.toString(td.getHeapConglomerateId()));
    if (uniqueWithDuplicateNulls && !hasDeferrableChecking) {
        if (dd.checkVersion(DataDictionary.DD_VERSION_DERBY_10_4, null)) {
            indexProperties.put("uniqueWithDuplicateNulls", Boolean.toString(true));
        } else {
            // index creating a unique index instead.
            if (uniqueWithDuplicateNulls) {
                unique = true;
            }
        }
    }
    // All indexes are unique because they contain the RowLocation.
    // The number of uniqueness columns must include the RowLocation
    // if the user did not specify a unique index.
    indexProperties.put("nUniqueColumns", Integer.toString(unique ? baseColumnPositions.length : baseColumnPositions.length + 1));
    // By convention, the row location column is the last column
    indexProperties.put("rowLocationColumn", Integer.toString(baseColumnPositions.length));
    // For now, all columns are key fields, including the RowLocation
    indexProperties.put("nKeyFields", Integer.toString(baseColumnPositions.length + 1));
    // For now, assume that all index columns are ordered columns
    if (!shareExisting) {
        if (dd.checkVersion(DataDictionary.DD_VERSION_DERBY_10_4, null)) {
            indexRowGenerator = new IndexRowGenerator(indexType, unique, uniqueWithDuplicateNulls, uniqueDeferrable, (hasDeferrableChecking && constraintType != DataDictionary.FOREIGNKEY_CONSTRAINT), baseColumnPositions, isAscending, baseColumnPositions.length);
        } else {
            indexRowGenerator = new IndexRowGenerator(indexType, unique, false, false, false, baseColumnPositions, isAscending, baseColumnPositions.length);
        }
    }
    /* Now add the rows from the base table to the conglomerate.
		 * We do this by scanning the base table and inserting the
		 * rows into a sorter before inserting from the sorter
		 * into the index.  This gives us better performance
		 * and a more compact index.
		 */
    rowSource = null;
    sortId = 0;
    // set to true once the sorter is created
    boolean needToDropSort = false;
    /* bulkFetchSIze will be 16 (for now) unless
		 * we are creating the table in which case it
		 * will be 1.  Too hard to remove scan when
		 * creating index on new table, so minimize
		 * work where we can.
		 */
    int bulkFetchSize = (forCreateTable) ? 1 : 16;
    int numColumns = td.getNumberOfColumns();
    int approximateRowSize = 0;
    // Create the FormatableBitSet for mapping the partial to full base row
    FormatableBitSet bitSet = new FormatableBitSet(numColumns + 1);
    for (int index = 0; index < baseColumnPositions.length; index++) {
        bitSet.set(baseColumnPositions[index]);
    }
    FormatableBitSet zeroBasedBitSet = RowUtil.shift(bitSet, 1);
    // Start by opening a full scan on the base table.
    scan = tc.openGroupFetchScan(td.getHeapConglomerateId(), // hold
    false, // open base table read only
    0, TransactionController.MODE_TABLE, TransactionController.ISOLATION_SERIALIZABLE, // all fields as objects
    zeroBasedBitSet, // startKeyValue
    (DataValueDescriptor[]) null, // not used when giving null start posn.
    0, // qualifier
    null, // stopKeyValue
    (DataValueDescriptor[]) null, // not used when giving null stop posn.
    0);
    // Create an array to put base row template
    baseRows = new ExecRow[bulkFetchSize];
    indexRows = new ExecIndexRow[bulkFetchSize];
    compactBaseRows = new ExecRow[bulkFetchSize];
    try {
        // Create the array of base row template
        for (int i = 0; i < bulkFetchSize; i++) {
            // create a base row template
            baseRows[i] = activation.getExecutionFactory().getValueRow(maxBaseColumnPosition);
            // create an index row template
            indexRows[i] = indexRowGenerator.getIndexRowTemplate();
            // create a compact base row template
            compactBaseRows[i] = activation.getExecutionFactory().getValueRow(baseColumnPositions.length);
        }
        indexTemplateRow = indexRows[0];
        // Fill the partial row with nulls of the correct type
        ColumnDescriptorList cdl = td.getColumnDescriptorList();
        int cdlSize = cdl.size();
        for (int index = 0, numSet = 0; index < cdlSize; index++) {
            if (!zeroBasedBitSet.get(index)) {
                continue;
            }
            numSet++;
            ColumnDescriptor cd = cdl.elementAt(index);
            DataTypeDescriptor dts = cd.getType();
            for (int i = 0; i < bulkFetchSize; i++) {
                // Put the column in both the compact and sparse base rows
                baseRows[i].setColumn(index + 1, dts.getNull());
                compactBaseRows[i].setColumn(numSet, baseRows[i].getColumn(index + 1));
            }
            // Calculate the approximate row size for the index row
            approximateRowSize += dts.getTypeId().getApproximateLengthInBytes(dts);
        }
        // Get an array of RowLocation template
        RowLocation[] rl = new RowLocation[bulkFetchSize];
        for (int i = 0; i < bulkFetchSize; i++) {
            rl[i] = scan.newRowLocationTemplate();
            // Get an index row based on the base row
            indexRowGenerator.getIndexRow(compactBaseRows[i], rl[i], indexRows[i], bitSet);
        }
        /* now that we got indexTemplateRow, done for sharing index
			 */
        if (shareExisting)
            return;
        /* For non-unique indexes, we order by all columns + the RID.
			 * For unique indexes, we just order by the columns.
			 * We create a unique index observer for unique indexes
			 * so that we can catch duplicate key.
			 * We create a basic sort observer for non-unique indexes
			 * so that we can reuse the wrappers during an external
			 * sort.
			 */
        int numColumnOrderings;
        SortObserver sortObserver;
        Properties sortProperties = null;
        if (unique || uniqueWithDuplicateNulls || uniqueDeferrable) {
            // if the index is a constraint, use constraintname in
            // possible error message
            String indexOrConstraintName = indexName;
            if (conglomerateUUID != null) {
                ConglomerateDescriptor cd = dd.getConglomerateDescriptor(conglomerateUUID);
                if ((isConstraint) && (cd != null && cd.getUUID() != null && td != null)) {
                    ConstraintDescriptor conDesc = dd.getConstraintDescriptor(td, cd.getUUID());
                    indexOrConstraintName = conDesc.getConstraintName();
                }
            }
            if (unique || uniqueDeferrable) {
                numColumnOrderings = unique ? baseColumnPositions.length : baseColumnPositions.length + 1;
                sortObserver = new UniqueIndexSortObserver(lcc, constraintID, true, uniqueDeferrable, initiallyDeferred, indexOrConstraintName, indexTemplateRow, true, td.getName());
            } else {
                // unique with duplicate nulls allowed.
                numColumnOrderings = baseColumnPositions.length + 1;
                // tell transaction controller to use the unique with
                // duplicate nulls sorter, when making createSort() call.
                sortProperties = new Properties();
                sortProperties.put(AccessFactoryGlobals.IMPL_TYPE, AccessFactoryGlobals.SORT_UNIQUEWITHDUPLICATENULLS_EXTERNAL);
                // use sort operator which treats nulls unequal
                sortObserver = new UniqueWithDuplicateNullsIndexSortObserver(lcc, constraintID, true, (hasDeferrableChecking && constraintType != DataDictionary.FOREIGNKEY_CONSTRAINT), initiallyDeferred, indexOrConstraintName, indexTemplateRow, true, td.getName());
            }
        } else {
            numColumnOrderings = baseColumnPositions.length + 1;
            sortObserver = new BasicSortObserver(true, false, indexTemplateRow, true);
        }
        ColumnOrdering[] order = new ColumnOrdering[numColumnOrderings];
        for (int i = 0; i < numColumnOrderings; i++) {
            order[i] = new IndexColumnOrder(i, unique || i < numColumnOrderings - 1 ? isAscending[i] : true);
        }
        // create the sorter
        sortId = tc.createSort(sortProperties, indexTemplateRow.getRowArrayClone(), order, sortObserver, // not in order
        false, scan.getEstimatedRowCount(), // est row size, -1 means no idea
        approximateRowSize);
        needToDropSort = true;
        // Populate sorter and get the output of the sorter into a row
        // source.  The sorter has the indexed columns only and the columns
        // are in the correct order.
        rowSource = loadSorter(baseRows, indexRows, tc, scan, sortId, rl);
        conglomId = tc.createAndLoadConglomerate(indexType, // index row template
        indexTemplateRow.getRowArray(), // colums sort order
        order, indexRowGenerator.getColumnCollationIds(td.getColumnDescriptorList()), indexProperties, // not temporary
        TransactionController.IS_DEFAULT, rowSource, (long[]) null);
    } finally {
        /* close the table scan */
        if (scan != null)
            scan.close();
        /* close the sorter row source before throwing exception */
        if (rowSource != null)
            rowSource.closeRowSource();
        /*
			** drop the sort so that intermediate external sort run can be
			** removed from disk
			*/
        if (needToDropSort)
            tc.dropSort(sortId);
    }
    ConglomerateController indexController = tc.openConglomerate(conglomId, false, 0, TransactionController.MODE_TABLE, TransactionController.ISOLATION_SERIALIZABLE);
    // Check to make sure that the conglomerate can be used as an index
    if (!indexController.isKeyed()) {
        indexController.close();
        throw StandardException.newException(SQLState.LANG_NON_KEYED_INDEX, indexName, indexType);
    }
    indexController.close();
    // 
    if (!alreadyHaveConglomDescriptor) {
        ConglomerateDescriptor cgd = ddg.newConglomerateDescriptor(conglomId, indexName, true, indexRowGenerator, isConstraint, conglomerateUUID, td.getUUID(), sd.getUUID());
        dd.addDescriptor(cgd, sd, DataDictionary.SYSCONGLOMERATES_CATALOG_NUM, false, tc);
        // add newly added conglomerate to the list of conglomerate
        // descriptors in the td.
        ConglomerateDescriptorList cdl = td.getConglomerateDescriptorList();
        cdl.add(cgd);
        /* Since we created a new conglomerate descriptor, load
			 * its UUID into the corresponding field, to ensure that
			 * it is properly set in the StatisticsDescriptor created
			 * below.
			 */
        conglomerateUUID = cgd.getUUID();
    }
    CardinalityCounter cCount = (CardinalityCounter) rowSource;
    long numRows = cCount.getRowCount();
    if (addStatistics(dd, indexRowGenerator, numRows)) {
        long[] c = cCount.getCardinality();
        for (int i = 0; i < c.length; i++) {
            StatisticsDescriptor statDesc = new StatisticsDescriptor(dd, dd.getUUIDFactory().createUUID(), conglomerateUUID, td.getUUID(), "I", new StatisticsImpl(numRows, c[i]), i + 1);
            dd.addDescriptor(statDesc, null, DataDictionary.SYSSTATISTICS_CATALOG_NUM, true, tc);
        }
    }
}

Example 12 with IndexRowGenerator

use of org.apache.derby.iapi.sql.dictionary.IndexRowGenerator in project derby by apache.

the class TabInfoImpl method getRowChanger.

/**
 *	Gets a row changer for this catalog.
 *
 *	@param	tc	transaction controller
 *	@param	changedCols	the columns to change (1 based), may be null
 * @param  baseRow used to detemine column types at creation time
 *         only. The row changer does ***Not*** keep a referance to
 *         this row or change it in any way.
 *
 *	@return	a row changer for this catalog.
 * @exception StandardException		Thrown on failure
 */
private RowChanger getRowChanger(TransactionController tc, int[] changedCols, ExecRow baseRow) throws StandardException {
    RowChanger rc;
    int indexCount = crf.getNumIndexes();
    IndexRowGenerator[] irgs = new IndexRowGenerator[indexCount];
    long[] cids = new long[indexCount];
    if (SanityManager.DEBUG) {
        if (changedCols != null) {
            for (int i = changedCols.length - 1; i >= 0; i--) {
                SanityManager.ASSERT(changedCols[i] != 0, "Column id is 0, but should be 1 based");
            }
        }
    }
    for (int ictr = 0; ictr < indexCount; ictr++) {
        irgs[ictr] = getIndexRowGenerator(ictr);
        cids[ictr] = getIndexConglomerate(ictr);
    }
    rc = crf.getExecutionFactory().getRowChanger(getHeapConglomerate(), (StaticCompiledOpenConglomInfo) null, (DynamicCompiledOpenConglomInfo) null, irgs, cids, (StaticCompiledOpenConglomInfo[]) null, (DynamicCompiledOpenConglomInfo[]) null, crf.getHeapColumnCount(), tc, changedCols, getStreamStorableHeapColIds(baseRow), (Activation) null);
    return rc;
}

Example 13 with IndexRowGenerator

use of org.apache.derby.iapi.sql.dictionary.IndexRowGenerator in project derby by apache.

the class InsertResultSet method setUpAllSorts.

/**
 * Set up to update all of the indexes on a table when doing a bulk insert
 * on an empty table.
 *
 * @exception StandardException					thrown on error
 */
private void setUpAllSorts(ExecRow sourceRow, RowLocation rl) throws StandardException {
    int numIndexes = constants.irgs.length;
    int numColumns = td.getNumberOfColumns();
    ordering = new ColumnOrdering[numIndexes][];
    collation = new int[numIndexes][];
    needToDropSort = new boolean[numIndexes];
    sortIds = new long[numIndexes];
    rowSources = new RowLocationRetRowSource[numIndexes];
    // indexedCols is 1-based
    indexedCols = new FormatableBitSet(numColumns + 1);
    /* For each index, build a single index row, collation templage, 
         * and a sorter. 
         */
    for (int index = 0; index < numIndexes; index++) {
        // Update the bit map of indexed columns
        int[] keyColumns = constants.irgs[index].baseColumnPositions();
        for (int i2 = 0; i2 < keyColumns.length; i2++) {
            // indexedCols is 1-based
            indexedCols.set(keyColumns[i2]);
        }
        // create a single index row template for each index
        indexRows[index] = constants.irgs[index].getIndexRowTemplate();
        // Get an index row based on the base row
        // (This call is only necessary here because we need to
        // pass a template to the sorter.)
        constants.irgs[index].getIndexRow(sourceRow, rl, indexRows[index], (FormatableBitSet) null);
        /* For non-unique indexes, we order by all columns + the RID.
			 * For unique indexes, we just order by the columns.
			 * We create a unique index observer for unique indexes
			 * so that we can catch duplicate key
			 */
        // Get the ConglomerateDescriptor for the index
        ConglomerateDescriptor cd = td.getConglomerateDescriptor(constants.indexCIDS[index]);
        int[] baseColumnPositions = constants.irgs[index].baseColumnPositions();
        boolean[] isAscending = constants.irgs[index].isAscending();
        int numColumnOrderings;
        SortObserver sortObserver;
        /* We can only reuse the wrappers when doing an
			 * external sort if there is only 1 index.  Otherwise,
			 * we could get in a situation where 1 sort reuses a
			 * wrapper that is still in use in another sort.
			 */
        boolean reuseWrappers = (numIndexes == 1);
        final IndexRowGenerator indDes = cd.getIndexDescriptor();
        Properties sortProperties = null;
        String indexOrConstraintName = cd.getConglomerateName();
        boolean deferred = false;
        boolean deferrable = false;
        UUID uniqueDeferrableConstraintId = null;
        if (cd.isConstraint()) {
            // so, the index is backing up a constraint
            ConstraintDescriptor conDesc = dd.getConstraintDescriptor(td, cd.getUUID());
            indexOrConstraintName = conDesc.getConstraintName();
            deferred = lcc.isEffectivelyDeferred(lcc.getCurrentSQLSessionContext(activation), conDesc.getUUID());
            deferrable = conDesc.deferrable();
            uniqueDeferrableConstraintId = conDesc.getUUID();
        }
        if (indDes.isUnique() || indDes.isUniqueDeferrable()) {
            numColumnOrderings = indDes.isUnique() ? baseColumnPositions.length : baseColumnPositions.length + 1;
            sortObserver = new UniqueIndexSortObserver(lcc, uniqueDeferrableConstraintId, // don't clone rows
            false, deferrable, deferred, indexOrConstraintName, indexRows[index], reuseWrappers, td.getName());
        } else if (indDes.isUniqueWithDuplicateNulls()) {
            numColumnOrderings = baseColumnPositions.length + 1;
            // tell transaction controller to use the unique with
            // duplicate nulls sorter, when making createSort() call.
            sortProperties = new Properties();
            sortProperties.put(AccessFactoryGlobals.IMPL_TYPE, AccessFactoryGlobals.SORT_UNIQUEWITHDUPLICATENULLS_EXTERNAL);
            // use sort operator which treats nulls unequal
            sortObserver = new UniqueWithDuplicateNullsIndexSortObserver(lcc, uniqueDeferrableConstraintId, true, deferrable, deferred, indexOrConstraintName, indexRows[index], true, td.getName());
        } else {
            numColumnOrderings = baseColumnPositions.length + 1;
            sortObserver = new BasicSortObserver(false, false, indexRows[index], reuseWrappers);
        }
        ordering[index] = new ColumnOrdering[numColumnOrderings];
        for (int ii = 0; ii < isAscending.length; ii++) {
            ordering[index][ii] = new IndexColumnOrder(ii, isAscending[ii]);
        }
        if (numColumnOrderings > isAscending.length) {
            ordering[index][isAscending.length] = new IndexColumnOrder(isAscending.length);
        }
        // set collation templates for later index creation
        // call (createAndLoadConglomerate())
        collation[index] = constants.irgs[index].getColumnCollationIds(td.getColumnDescriptorList());
        // create the sorters
        sortIds[index] = tc.createSort(sortProperties, indexRows[index].getRowArrayClone(), ordering[index], sortObserver, // not in order
        false, // est rows
        (int) sourceResultSet.getEstimatedRowCount(), // est row size, -1 means no idea
        -1);
        needToDropSort[index] = true;
    }
    sorters = new SortController[numIndexes];
    // Open the sorts
    for (int index = 0; index < numIndexes; index++) {
        sorters[index] = tc.openSort(sortIds[index]);
        needToDropSort[index] = true;
    }
}

Example 14 with IndexRowGenerator

use of org.apache.derby.iapi.sql.dictionary.IndexRowGenerator in project derby by apache.

the class DMLModStatementNode method getXAffectedIndexes.

/**
 *	Marks which indexes are affected by an UPDATE of the
 *	desired shape.
 *
 *	Is passed a list of updated columns. Does the following:
 *
 *	1)	finds all indices which overlap the updated columns
 *	2)	adds the index columns to a bitmap of affected columns
 *	3)	adds the index descriptors to a list of conglomerate
 *		descriptors.
 *
 *	@param	updatedColumns	a list of updated columns
 *	@param	colBitSet		OUT: evolving bitmap of affected columns
 * @param  conglomerates   OUT: list of affected indices
 *
 * @exception StandardException		Thrown on error
 */
static void getXAffectedIndexes(TableDescriptor baseTable, ResultColumnList updatedColumns, FormatableBitSet colBitSet, List<ConglomerateDescriptor> conglomerates) throws StandardException {
    ConglomerateDescriptor[] cds = baseTable.getConglomerateDescriptors();
    /* we only get distinct conglomerate numbers.  If duplicate indexes
		 * share one conglomerate, we only return one number.
		 */
    long[] distinctConglomNums = new long[cds.length - 1];
    int distinctCount = 0;
    for (int index = 0; index < cds.length; index++) {
        ConglomerateDescriptor cd = cds[index];
        if (!cd.isIndex()) {
            continue;
        }
        /*
			** If this index doesn't contain any updated
			** columns, then we can skip it.
			*/
        if ((updatedColumns != null) && (!updatedColumns.updateOverlaps(cd.getIndexDescriptor().baseColumnPositions()))) {
            continue;
        }
        if (conglomerates != null) {
            int i;
            for (i = 0; i < distinctCount; i++) {
                if (distinctConglomNums[i] == cd.getConglomerateNumber())
                    break;
            }
            if (// first appearence
            i == distinctCount) {
                distinctConglomNums[distinctCount++] = cd.getConglomerateNumber();
                conglomerates.add(cd);
            }
        }
        IndexRowGenerator ixd = cd.getIndexDescriptor();
        int[] cols = ixd.baseColumnPositions();
        if (colBitSet != null) {
            for (int i = 0; i < cols.length; i++) {
                colBitSet.set(cols[i]);
            }
        }
    // end IF
    }
// end loop through conglomerates
}

Example 15 with IndexRowGenerator

use of org.apache.derby.iapi.sql.dictionary.IndexRowGenerator in project derby by apache.

the class FromBaseTable method isCoveringIndex.

/**
 * @see org.apache.derby.iapi.sql.compile.Optimizable#isCoveringIndex
 * @exception StandardException		Thrown on error
 */
@Override
public boolean isCoveringIndex(ConglomerateDescriptor cd) throws StandardException {
    boolean coveringIndex = true;
    IndexRowGenerator irg;
    int[] baseCols;
    int colPos;
    /* You can only be a covering index if you're an index */
    if (!cd.isIndex())
        return false;
    irg = cd.getIndexDescriptor();
    baseCols = irg.baseColumnPositions();
    /* First we check to see if this is a covering index */
    for (ResultColumn rc : getResultColumns()) {
        /* Ignore unreferenced columns */
        if (!rc.isReferenced()) {
            continue;
        }
        /* Ignore constants - this can happen if all of the columns
			 * were projected out and we ended up just generating
			 * a "1" in RCL.doProject().
			 */
        if (rc.getExpression() instanceof ConstantNode) {
            continue;
        }
        coveringIndex = false;
        colPos = rc.getColumnPosition();
        /* Is this column in the index? */
        for (int i = 0; i < baseCols.length; i++) {
            if (colPos == baseCols[i]) {
                coveringIndex = true;
                break;
            }
        }
        /* No need to continue if the column was not in the index */
        if (!coveringIndex) {
            break;
        }
    }
    return coveringIndex;
}