本文整理汇总了C++中ASTPtr::getTreeHash方法的典型用法代码示例。如果您正苦于以下问题：C++ ASTPtr::getTreeHash方法的具体用法？C++ ASTPtr::getTreeHash怎么用？C++ ASTPtr::getTreeHash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ASTPtr的用法示例。
在下文中一共展示了ASTPtr::getTreeHash方法的1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C++代码示例。
示例1: processImpl
static void processImpl(const ASTPtr & ast, CollectAliases::Aliases & aliases, CollectAliases::Kind kind, size_t keep_kind_for_depth)
{
String alias = ast->tryGetAlias();
if (!alias.empty())
{
auto it_inserted = aliases.emplace(alias, CollectAliases::AliasInfo(ast, kind));
if (!it_inserted.second && ast->getTreeHash() != it_inserted.first->second.node->getTreeHash())
{
std::stringstream message;
message << "Different expressions with the same alias " << backQuoteIfNeed(alias) << ":\n";
formatAST(*it_inserted.first->second.node, message, 0, false, true);
message << "\nand\n";
formatAST(*ast, message, 0, false, true);
message << "\n";
throw Exception(message.str(), ErrorCodes::MULTIPLE_EXPRESSIONS_FOR_ALIAS);
}
}
for (auto & child : ast->children)
{
if (typeid_cast<const ASTSelectQuery *>(child.get()))
{
/// Don't go into subqueries.
}
else if (typeid_cast<const ASTTableExpression *>(child.get()))
{
processImpl(child, aliases, CollectAliases::Kind::Table, 1);
}
else if (typeid_cast<const ASTArrayJoin *>(child.get()))
{
/// ASTArrayJoin -> ASTExpressionList -> element of expression AS alias
processImpl(child, aliases, CollectAliases::Kind::ArrayJoin, 3);
}
else if (keep_kind_for_depth > 0)
{
processImpl(child, aliases, kind, keep_kind_for_depth - 1);
}
else
{
processImpl(child, aliases, CollectAliases::Kind::Expression, 0);
}
}
}