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Experiment: attempt to shrink arrays

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This commit is contained in:
Dmitry Krylov 2021-03-10 21:24:01 +10:00
parent b571656fd7
commit 7c47832405
1 changed files with 16 additions and 0 deletions
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16
src/Functions/array/FunctionArrayMapped.h
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@ -42,6 +42,14 @@ namespace ErrorCodes
template <typename Impl, typename Name>
class FunctionArrayMapped : public IFunction
{
private:
size_t
my_min(size_t a, size_t b) const
{
return (a < b) ? a : b;
}
public:
static constexpr auto name = Name::name;
static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayMapped>(); }
@ -195,6 +203,14 @@ public:
column_array = checkAndGetColumn<ColumnArray>(column_array_ptr.get());
}
ColumnPtr int_column = column_array->getDataPtr();
ColumnPtr ca_ptr = ColumnArray::create( int_column->cut(0, my_min(1, int_column->size())),
column_array->getOffsetsPtr());
const auto * ca = checkAndGetColumn<ColumnArray>(ca_ptr.get());
column_array_ptr = ca_ptr;
column_array = ca;
if (!array_type)
throw Exception("Expected array type, found " + array_type_ptr->getName(), ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);