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#pragma once
#include <Common/HashTable/HashTableKeyHolder.h>
#include <Columns/IColumn.h>
namespace DB
{
struct Settings;
template <bool is_plain_column = false>
static auto getKeyHolder(const IColumn & column, size_t row_num, Arena & arena)
{
if constexpr (is_plain_column)
{
return ArenaKeyHolder{column.getDataAt(row_num), arena};
}
else
{
const char * begin = nullptr;
StringRef serialized = column.serializeValueIntoArena(row_num, arena, begin);
assert(serialized.data != nullptr);
return SerializedKeyHolder{serialized, arena};
}
}
template <bool is_plain_column>
static void deserializeAndInsert(StringRef str, IColumn & data_to)
{
if constexpr (is_plain_column)
data_to.insertData(str.data, str.size);
else
data_to.deserializeAndInsertFromArena(str.data);
}
}
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