ClickHouse/src/Interpreters/getClusterName.cpp
2020-04-03 18:14:31 +03:00

57 lines
1.4 KiB
C++

#include <Parsers/IAST.h>
#include <Parsers/ASTIdentifier.h>
#include <Parsers/ASTLiteral.h>
#include <Parsers/ASTFunction.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)
{
if (const auto * ast_id = node.as<ASTIdentifier>())
return ast_id->name;
if (const auto * ast_lit = node.as<ASTLiteral>())
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)
throw Exception("Illegal expression instead of cluster name.", ErrorCodes::BAD_ARGUMENTS);
String name;
for (const auto & arg : ast_func->arguments->children)
{
if (name.empty())
name += getClusterName(*arg);
else
name += "-" + getClusterName(*arg);
}
return name;
}
throw Exception("Illegal expression instead of cluster name.", ErrorCodes::BAD_ARGUMENTS);
}
String getClusterNameAndMakeLiteral(ASTPtr & node)
{
String cluster_name = getClusterName(*node);
node = std::make_shared<ASTLiteral>(cluster_name);
return cluster_name;
}
}