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33 lines
1.1 KiB
C++
33 lines
1.1 KiB
C++
#include <AggregateFunctions/UniqVariadicHash.h>
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#include <DataTypes/DataTypeTuple.h>
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#include <Common/typeid_cast.h>
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namespace DB
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{
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/// If some arguments are not contiguous, we cannot use simple hash function,
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/// because it requires method IColumn::getDataAt to work.
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/// Note that we treat single tuple argument in the same way as multiple arguments.
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bool isAllArgumentsContiguousInMemory(const DataTypes & argument_types)
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{
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auto check_all_arguments_are_contiguous_in_memory = [](const DataTypes & types)
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{
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for (const auto & type : types)
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if (!type->isValueUnambiguouslyRepresentedInContiguousMemoryRegion())
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return false;
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return true;
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};
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const DataTypeTuple * single_argument_as_tuple = nullptr;
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if (argument_types.size() == 1)
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single_argument_as_tuple = typeid_cast<const DataTypeTuple *>(argument_types[0].get());
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if (single_argument_as_tuple)
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return check_all_arguments_are_contiguous_in_memory(single_argument_as_tuple->getElements());
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else
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return check_all_arguments_are_contiguous_in_memory(argument_types);
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}
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}
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