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#include <Parsers/IAST.h>
#include <Parsers/ASTIdentifier.h>
#include <Parsers/ASTLiteral.h>
#include <Parsers/ASTFunction.h>
#include <Storages/checkAndGetLiteralArgument.h>
#include <Common/typeid_cast.h>
#include <Interpreters/getClusterName.h>
namespace DB
{
namespace ErrorCodes
{
extern const int BAD_ARGUMENTS;
}
std::string getClusterName(const IAST & node)
{
auto name = tryGetClusterName(node);
if (!name)
throw Exception(ErrorCodes::BAD_ARGUMENTS, "Illegal expression instead of cluster name.");
return std::move(name).value();
}
std::optional<std::string> tryGetClusterName(const IAST & node)
{
if (const auto * ast_id = node.as<ASTIdentifier>())
return ast_id->name();
if (const auto * ast_lit = node.as<ASTLiteral>())
{
if (ast_lit->value.getType() != Field::Types::String)
return {};
return ast_lit->value.safeGet<String>();
}
/// A hack to support hyphens in cluster names.
if (const auto * ast_func = node.as<ASTFunction>())
{
if (ast_func->name != "minus" || !ast_func->arguments || ast_func->arguments->children.size() < 2)
return {};
String name;
for (const auto & arg : ast_func->arguments->children)
{
if (name.empty())
name += getClusterName(*arg);
else
name += "-" + getClusterName(*arg);
}
return name;
}
return {};
}
std::string getClusterNameAndMakeLiteral(ASTPtr & node)
{
String cluster_name = getClusterName(*node);
node = std::make_shared<ASTLiteral>(cluster_name);
return cluster_name;
}
}
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