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