当前位置: 首页>>代码示例>>Java>>正文


Java TableNode.copy方法代码示例

本文整理汇总了Java中com.taobao.tddl.optimizer.core.ast.query.TableNode.copy方法的典型用法代码示例。如果您正苦于以下问题:Java TableNode.copy方法的具体用法?Java TableNode.copy怎么用?Java TableNode.copy使用的例子?那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在com.taobao.tddl.optimizer.core.ast.query.TableNode的用法示例。


在下文中一共展示了TableNode.copy方法的3个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的Java代码示例。

示例1: buildMergeTable

import com.taobao.tddl.optimizer.core.ast.query.TableNode; //导入方法依赖的package包/类
/**
 * 根据执行的目标节点,构建MergeNode
 */
private static QueryTreeNode buildMergeTable(TableNode table, List<TargetDB> dataNodeChoosed,
                                             Map<String, Object> extraCmd, boolean traceIn) {
    long maxRowCount = 0;
    String maxRowCountDataNode = dataNodeChoosed.get(0).getDbIndex();
    List<List<QueryTreeNode>> subs = new ArrayList();
    // 单库单表是大多数场景,此时无需复制执行计划
    // 大部分情况只有一张表
    boolean needCopy = false;
    if (dataNodeChoosed.size() > 0 && dataNodeChoosed.get(0).getTableNameMap().size() > 0) {
        Map<String, Field> tabMap = dataNodeChoosed.get(0).getTableNameMap();
        Entry<String, Field> entry = tabMap.entrySet().iterator().next();
        // 如果存在in,则必须使用复制
        if (traceIn && entry.getValue() != null) {
            needCopy |= traceSourceInFilter(table.getKeyFilter(), entry.getValue().getSourceKeys(), true);
            needCopy |= traceSourceInFilter(table.getResultFilter(), entry.getValue().getSourceKeys(), true);
        }

        if (!chooseShareNode(extraCmd) && tabMap.size() > 1) {
            // 如果不使用share模式,并且多于一张表,那就采用复制模式
            needCopy = true;
        }

        if (!needCopy && tabMap.size() > 1) {
            table = table.copy(); // 针对share模式,需要复制一份
        }

    }

    int index = 0;
    for (TargetDB target : dataNodeChoosed) {
        OneDbNodeWithCount oneDbNodeWithCount = buildMergeTableInOneDB(table, target, index, needCopy, traceIn);
        if (!oneDbNodeWithCount.subs.isEmpty()) {
            subs.add(oneDbNodeWithCount.subs);
        }

        index += target.getTableNameMap().size();
        if (oneDbNodeWithCount.totalRowCount > maxRowCount) {
            maxRowCount = oneDbNodeWithCount.totalRowCount;
            maxRowCountDataNode = target.getDbIndex();
        }

    }

    if (subs.isEmpty()) {
        throw new EmptyResultFilterException();
    } else if (subs.size() == 1 && subs.get(0).size() == 1) {
        return subs.get(0).get(0); // 只有单库
    } else {
        // 多库执行
        MergeNode merge = new MergeNode();
        merge.setAlias(table.getAlias());
        merge.setSubQuery(table.isSubQuery());
        merge.setSubAlias(table.getSubAlias());
        merge.executeOn(maxRowCountDataNode);
        merge.setSubqueryOnFilterId(table.getSubqueryOnFilterId());
        for (List<QueryTreeNode> subList : subs) {
            for (QueryTreeNode sub : subList) {
                merge.merge(sub);
            }
        }
        merge.setBroadcast(false);// merge不可能是广播表
        merge.build();// build过程中会复制子节点的信息
        return merge;
    }
}
 
开发者ID:loye168,项目名称:tddl5,代码行数:69,代码来源:DataNodeChooser.java

示例2: buildMergeTableInOneDB

import com.taobao.tddl.optimizer.core.ast.query.TableNode; //导入方法依赖的package包/类
/**
 * 构建单库的执行节点
 */
private static OneDbNodeWithCount buildMergeTableInOneDB(TableNode table, TargetDB targetDB, int baseIndex,
                                                         boolean needCopy, boolean traceIn) {
    long totalRowCount = 0;
    OneDbNodeWithCount oneDbNodeWithCount = new OneDbNodeWithCount();
    Map<String, Field> tabMap = targetDB.getTableNameMap();
    int i = baseIndex;
    for (String targetTable : tabMap.keySet()) {
        TableNode node = table;
        if (needCopy) {
            node = table.copy();

            // tddl的traceSource在分库不分表,和全表扫描时无法使用 mengshi
            if (traceIn && tabMap.get(targetTable) != null && tabMap.get(targetTable).getSourceKeys() != null) {
                traceSourceInFilter(node.getKeyFilter(), tabMap.get(targetTable).getSourceKeys(), false);
                traceSourceInFilter(node.getResultFilter(), tabMap.get(targetTable).getSourceKeys(), false);
            }
        }

        if (needCopy) {
            node.setActualTableName(targetTable);
            node.executeOn(targetDB.getDbIndex());
            node.setExtra(getIdentifierExtra((KVIndexNode) node, 0));// 设置标志
            oneDbNodeWithCount.subs.add(node);
        } else {
            node.setActualTableName(targetTable, i);
            node.executeOn(targetDB.getDbIndex(), i);
            node.setExtra(getIdentifierExtra((KVIndexNode) node, i), i);// 设置标志
            // 添加一个代理对象
            oneDbNodeWithCount.subs.add((QueryTreeNode) new NodeDelegate(node, i).getProxy());
            i = i + 1;
        }

        // 暂时先用逻辑表名,以后可能是索引名
        String indexName = null;
        if (node instanceof KVIndexNode) {
            indexName = ((KVIndexNode) node).getKvIndexName();
        } else {
            indexName = node.getTableMeta().getPrimaryIndex().getName();
        }
        node.setBroadcast(OptimizerContext.getContext().getRule().isBroadCast(indexName));
        totalRowCount += CostEsitimaterFactory.estimate(node).getRowCount();
    }

    oneDbNodeWithCount.totalRowCount = totalRowCount;
    return oneDbNodeWithCount;
}
 
开发者ID:loye168,项目名称:tddl5,代码行数:50,代码来源:DataNodeChooser.java

示例3: buildMergeTableInOneDB

import com.taobao.tddl.optimizer.core.ast.query.TableNode; //导入方法依赖的package包/类
/**
 * 构建单库的执行节点
 */
private static OneDbNodeWithCount buildMergeTableInOneDB(TableNode table, TargetDB targetDB, boolean needCopy) {
    long totalRowCount = 0;
    OneDbNodeWithCount oneDbNodeWithCount = new OneDbNodeWithCount();
    Map<String, Field> tabMap = targetDB.getTableNameMap();
    for (String targetTable : tabMap.keySet()) {
        TableNode node = null;
        if (needCopy) {
            node = table.copy();
        } else {
            node = table;
        }

        // tddl的traceSource在分库不分表,和全表扫描时无法使用 mengshi
        if (tabMap.get(targetTable) != null && tabMap.get(targetTable).getSourceKeys() != null) {
            if (node.getKeyFilter() != null) {
                IFilter keyFilterAfterTraceSource = (IFilter) node.getKeyFilter().copy();
                traceSourceInFilter(keyFilterAfterTraceSource, tabMap.get(targetTable).getSourceKeys());
                node.setKeyFilter(keyFilterAfterTraceSource);
            }

            if (node.getResultFilter() != null) {
                IFilter valueFilterAfterTraceSource = (IFilter) node.getResultFilter().copy();
                traceSourceInFilter(valueFilterAfterTraceSource, tabMap.get(targetTable).getSourceKeys());
                node.setResultFilter(valueFilterAfterTraceSource);
            }
        }

        node.setActualTableName(targetTable);
        node.executeOn(targetDB.getDbIndex());
        node.setExtra(getIdentifierExtra((KVIndexNode) node));// 设置标志
        // 暂时先用逻辑表名,以后可能是索引名
        String indexName = null;
        if (node instanceof KVIndexNode) {
            indexName = ((KVIndexNode) node).getKvIndexName();
        } else {
            indexName = node.getTableMeta().getPrimaryIndex().getName();
        }
        node.setBroadcast(OptimizerContext.getContext().getRule().isBroadCast(indexName));

        totalRowCount += CostEsitimaterFactory.estimate(node).getRowCount();
        oneDbNodeWithCount.subs.add(node);
    }

    oneDbNodeWithCount.totalRowCount = totalRowCount;
    return oneDbNodeWithCount;
}
 
开发者ID:beebeandwer,项目名称:TDDL,代码行数:50,代码来源:DataNodeChooser.java


注:本文中的com.taobao.tddl.optimizer.core.ast.query.TableNode.copy方法示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台,相关代码片段筛选自各路编程大神贡献的开源项目,源码版权归原作者所有,传播和使用请参考对应项目的License;未经允许,请勿转载。