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25 lines
759 B
C++
25 lines
759 B
C++
#pragma once
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#include <string>
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#include <unordered_map>
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namespace DB
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{
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/// Alter conversions which should be applied on-fly for part. Build from of
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/// the most recent mutation commands for part. Now we have only rename_map
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/// here (from ALTER_RENAME) command, because for all other type of alters
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/// we can deduce conversions for part from difference between
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/// part->getColumns() and storage->getColumns().
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struct AlterConversions
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{
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/// Rename map new_name -> old_name
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std::unordered_map<std::string, std::string> rename_map;
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bool isColumnRenamed(const std::string & new_name) const { return rename_map.count(new_name) > 0; }
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std::string getColumnOldName(const std::string & new_name) const { return rename_map.at(new_name); }
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};
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}
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