Examples of FetchDescriptor

org.apache.derby.iapi.store.raw.FetchDescriptor
FetchDescriptor is used to package up all the arguments necessary to describe what rows and what row parts should be returned from the store back to language as part of a fetch.
The FetchDescriptor may also contain scratch space used to process the qualifiers passed in the scan. This scratch space will be used to cache information about the qualifiers, valid column list, row size so that calculations need only be done once per scan rather than every iteration.

Examples of org.apache.derby.iapi.store.raw.FetchDescriptor


        // TODO (mikem) - get rid of this new.


        page.fetchFromSlot(
           (RecordHandle) null, CR_SLOT, version_ret,
           new FetchDescriptor(1, CR_VERSION_BITSET, (Qualifier[][]) null), 
           false); 


        // use format id to create empty instance of right Conglomerate class
        cr = (ControlRow) Monitor.newInstanceFromIdentifier(version.getValue());
        cr.page = page;

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Examples of org.apache.derby.iapi.store.raw.FetchDescriptor

                // purging rows. 
                Page page   = leaf.page;




                // RowLocation column is in last column of template.
                FetchDescriptor lock_fetch_desc = 
                    RowUtil.getFetchDescriptorConstant(
                        scratch_template.length - 1);


                // loop backward so that purges which affect the slot table 
                // don't affect the loop (ie. they only move records we

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Examples of org.apache.derby.iapi.store.raw.FetchDescriptor

                (init_lock_fetch_desc.getValidColumnsArray())[init_template.length - 1] == 1); 
        }


        // note that we don't process qualifiers in btree fetch's
        this.init_fetchDesc             = 
            new FetchDescriptor(
                init_template.length, init_scanColumnList,(Qualifier[][]) null);


        initScanParams( 
            startKeyValue, startSearchOperator, 
            qualifier, stopKeyValue, stopSearchOperator);

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Examples of org.apache.derby.iapi.store.raw.FetchDescriptor

        }


        try {
            DataValueDescriptor[] fullKey = scan_position.getKeyTemplate();


            FetchDescriptor fetchDescriptor = null;
            boolean haveAllColumns = false;
            if (partialKey != null) {
                int copiedCols = 0;
                final int partialKeyLength =
                        (vcols == null) ? partialKey.length : vcols.length;

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Examples of org.apache.derby.iapi.store.raw.FetchDescriptor

        // we need to scan until we hit the end of the table or until we
        // run into a null.  Use this template to probe the "next" row so
        // that if we need to finish, fetch_row will have the right value.
        DataValueDescriptor[] check_row_template = new DataValueDescriptor[1];
        check_row_template[0] = fetch_row[0].getClone();
        FetchDescriptor check_row_desc = RowUtil.getFetchDescriptorConstant(1);


        // reopen the scan for reading from the beginning of the table.
        reopenScan(
            (DataValueDescriptor[]) null,
            ScanController.NA,

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Examples of org.apache.derby.iapi.store.raw.FetchDescriptor


                Page page   = leaf.page;




                // RowLocation column is in last column of template.
                FetchDescriptor lock_fetch_desc = 
                    RowUtil.getFetchDescriptorConstant(
                        scratch_template.length - 1);


                // loop backward so that purges which affect the slot table 
                // don't affect the loop (ie. they only move records we

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Examples of org.apache.derby.iapi.store.raw.FetchDescriptor

            if (!originalRow [i].equals(newRow [i]))
                return NO_MATCH;
        }
        //It might be a deleted record try getting a lock on it
        DataValueDescriptor[] template = runtime_mem.get_template(getRawTran());
        FetchDescriptor lock_fetch_desc = RowUtil.getFetchDescriptorConstant(
                                                    template.length - 1);
        RowLocation lock_row_loc = 
            (RowLocation) scratch_template[scratch_template.length - 1];
        boolean latch_released = !getLockingPolicy().lockNonScanRowOnPage(
                this.getConglomerate(), leaf, slot, lock_fetch_desc,template,

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Examples of org.apache.derby.iapi.store.raw.FetchDescriptor

                rowToInsert,
                SearchParameters.POSITION_LEFT_OF_PARTIAL_KEY_MATCH,
                scratch_template, this, false);


        // RowLocation column is in last column of template.
        FetchDescriptor lock_fetch_desc = 
            RowUtil.getFetchDescriptorConstant(
                scratch_template.length - 1);
        RowLocation lock_row_loc = 
            (RowLocation) scratch_template[scratch_template.length - 1];

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Examples of org.apache.derby.iapi.store.raw.FetchDescriptor


            Page page   = leaf.page;




            // RowLocation column is in last column of template.
            FetchDescriptor lock_fetch_desc = 
                RowUtil.getFetchDescriptorConstant(
                    scratch_template.length - 1);


            // loop backward so that purges which affect the slot table 
            // don't affect the loop (ie. they only move records we

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Examples of org.apache.derby.iapi.store.raw.FetchDescriptor

            // also fetch the columns behind the ones in the partial key
            for (int i = vcols.length; i < fullLength; i++) {
                columns.set(i);
            }
            savedFetchDescriptor =
                    new FetchDescriptor(fullLength, columns, null);
        }


        // Verify that the cached fetch descriptor matches the arguments
        // (will fail if this method is not called with the same parameters
        // as when the descriptor was created and cached).

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