本文整理汇总了Java中com.taobao.tddl.optimizer.core.ast.query.MergeNode.getChildren方法的典型用法代码示例。如果您正苦于以下问题：Java MergeNode.getChildren方法的具体用法？Java MergeNode.getChildren怎么用？Java MergeNode.getChildren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类com.taobao.tddl.optimizer.core.ast.query.MergeNode的用法示例。
在下文中一共展示了MergeNode.getChildren方法的4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: buildMergeQuery
import com.taobao.tddl.optimizer.core.ast.query.MergeNode; //导入方法依赖的package包/类
private static QueryTreeNode buildMergeQuery(QueryNode query, MergeNode mergeNode, Map<String, Object> extraCmd) {
List<QueryNode> mergeQuerys = new LinkedList<QueryNode>();
for (ASTNode child : mergeNode.getChildren()) {
// 在未做shard之前就有存在mergeNode的可能，要识别出来
// 比如OR条件，可能会被拆分为两个Query的Merge，这个经过build之后，会是Merge套Merge或者是Merge套Query
if (!(child instanceof MergeNode) && child.getExtra() != null) {
QueryNode newQuery = query.copySelf();// 只复制自己，不复制子节点
newQuery.setChild((QueryTreeNode) child);
newQuery.executeOn(child.getDataNode());
newQuery.setExtra(child.getExtra());
newQuery.setBroadcast(child.isBroadcast());
mergeQuerys.add(newQuery);
}
}
if (mergeQuerys.size() > 1) {
MergeNode merge = new MergeNode();
merge.setAlias(query.getAlias());
merge.setSubQuery(query.isSubQuery());
merge.setSubAlias(query.getSubAlias());
// 复制子节点的limit/to信息
merge.setLimitFrom(query.getLimitFrom());
merge.setLimitTo(query.getLimitTo());
merge.setSubqueryOnFilterId(query.getSubqueryOnFilterId());
for (QueryNode q : mergeQuerys) {
merge.merge(q);
}
merge.executeOn(mergeQuerys.get(0).getDataNode()).setExtra(mergeQuerys.get(0).getExtra());
merge.build();
return merge;
} else if (mergeQuerys.size() == 1) {
return mergeQuerys.get(0);
} else {
return query;
}
}
示例2: buildMergeQuery
import com.taobao.tddl.optimizer.core.ast.query.MergeNode; //导入方法依赖的package包/类
private static QueryTreeNode buildMergeQuery(QueryNode query, MergeNode mergeNode) {
List<QueryNode> mergeQuerys = new LinkedList<QueryNode>();
for (ASTNode child : mergeNode.getChildren()) {
// 在未做shard之前就有存在mergeNode的可能，要识别出来
// 比如OR条件，可能会被拆分为两个Query的Merge，这个经过build之后，会是Merge套Merge或者是Merge套Query
if (!(child instanceof MergeNode) && child.getExtra() != null) {
QueryNode newQuery = query.copy();
newQuery.setChild((QueryTreeNode) child);
newQuery.executeOn(child.getDataNode());
newQuery.setExtra(child.getExtra());
newQuery.setBroadcast(child.isBroadcast());
mergeQuerys.add(newQuery);
}
}
if (mergeQuerys.size() > 1) {
MergeNode merge = new MergeNode();
merge.setAlias(query.getAlias());
merge.setSubQuery(query.isSubQuery());
merge.setSubAlias(query.getSubAlias());
for (QueryNode q : mergeQuerys) {
merge.merge(q);
}
merge.executeOn(mergeQuerys.get(0).getDataNode()).setExtra(mergeQuerys.get(0).getExtra());
merge.build();
return merge;
} else if (mergeQuerys.size() == 1) {
return mergeQuerys.get(0);
} else {
return query;
}
}
示例3: estimate
import com.taobao.tddl.optimizer.core.ast.query.MergeNode; //导入方法依赖的package包/类
@Override
public Cost estimate(QueryTreeNode query) throws StatisticsUnavailableException {
MergeNode merge = (MergeNode) query;
Cost cost = new Cost();
long rowCount = 0;
long io = 0;
long networkCost = 0;
long scanRowCount = 0;
if (!(merge.getChildren().get(0) instanceof QueryTreeNode)) {
return cost;
}
for (ASTNode sub : merge.getChildren()) {
Cost subCost = CostEsitimaterFactory.estimate((QueryTreeNode) sub);
rowCount += subCost.getRowCount();
scanRowCount += subCost.getScanCount();
// 如果两个不在一个节点上，就会产生网络开销，需要把sub的数据传送到merge节点上
if (merge.getDataNode() != null) {
if (!merge.getDataNode().equals(sub.getDataNode())) {
networkCost += subCost.getRowCount();
}
}
}
if (query.getLimitFrom() != null
&& (query.getLimitFrom() instanceof Long || query.getLimitFrom() instanceof Long)
&& (Long) query.getLimitFrom() != 0 && query.getLimitTo() != null
&& (query.getLimitTo() instanceof Long || query.getLimitTo() instanceof Long)
&& (Long) query.getLimitTo() != 0) {
rowCount = ((Long) query.getLimitTo() - (Long) query.getLimitFrom());
}
cost.setRowCount(rowCount);
cost.setDiskIO(io);
cost.setNetworkCost(networkCost);
cost.setIsOnFly(true);
cost.setScanCount(scanRowCount);
return cost;
}
示例4: estimate
import com.taobao.tddl.optimizer.core.ast.query.MergeNode; //导入方法依赖的package包/类
@Override
public Cost estimate(QueryTreeNode query) {
MergeNode merge = (MergeNode) query;
Cost cost = new Cost();
long rowCount = 0;
long io = 0;
long networkCost = 0;
long scanRowCount = 0;
if (!(merge.getChildren().get(0) instanceof QueryTreeNode)) {
return cost;
}
for (ASTNode sub : merge.getChildren()) {
Cost subCost = CostEsitimaterFactory.estimate((QueryTreeNode) sub);
rowCount += subCost.getRowCount();
scanRowCount += subCost.getScanCount();
// 如果两个不在一个节点上，就会产生网络开销，需要把sub的数据传送到merge节点上
if (merge.getDataNode() != null) {
if (!merge.getDataNode().equals(sub.getDataNode())) {
networkCost += subCost.getRowCount();
}
}
}
if (query.getLimitFrom() != null && query.getLimitTo() != null) {
Object from = query.getLimitFrom();
if (from instanceof IBindVal) {
from = ((IBindVal) from).getValue();
}
Object to = query.getLimitTo();
if (to instanceof IBindVal) {
to = ((IBindVal) from).getValue();
}
if (from instanceof Long && to instanceof Long) {
rowCount = ((Long) query.getLimitTo() - (Long) query.getLimitFrom());
}
}
cost.setRowCount(rowCount);
cost.setDiskIO(io);
cost.setNetworkCost(networkCost);
cost.setIsOnFly(true);
cost.setScanCount(scanRowCount);
return cost;
}