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Added a test

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This commit is contained in:
Alexey Milovidov 2020-06-14 08:15:29 +03:00
parent add7b76b83
commit 3958a032ac
3 changed files with 26 additions and 5 deletions
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10
src/AggregateFunctions/AggregateFunctionNull.cpp
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@ -33,6 +33,11 @@ public:
AggregateFunctionPtr transformAggregateFunction(
const AggregateFunctionPtr & nested_function, const DataTypes & arguments, const Array & params) const override
{
/// Special case for 'count' function. It could be called with Nullable arguments
/// - that means - count number of calls, when all arguments are not NULL.
if (nested_function && nested_function->getName() == "count")
return std::make_shared<AggregateFunctionCountNotNullUnary>(arguments[0], params);
bool has_nullable_types = false;
bool has_null_types = false;
for (const auto & arg_type : arguments)
@ -60,11 +65,6 @@ public:
if (auto adapter = nested_function->getOwnNullAdapter(nested_function, arguments, params))
return adapter;
/// Special case for 'count' function. It could be called with Nullable arguments
/// - that means - count number of calls, when all arguments are not NULL.
if (nested_function->getName() == "count")
return std::make_shared<AggregateFunctionCountNotNullUnary>(arguments[0], params);
bool return_type_is_nullable = !nested_function->returnDefaultWhenOnlyNull() && nested_function->getReturnType()->canBeInsideNullable();
bool serialize_flag = return_type_is_nullable || nested_function->returnDefaultWhenOnlyNull();

9
tests/queries/0_stateless/01315_count_distinct_return_not_nullable.reference Normal file
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@ -0,0 +1,9 @@
0
0
0
5
5
5
0
\N
\N

12
tests/queries/0_stateless/01315_count_distinct_return_not_nullable.sql Normal file
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@ -0,0 +1,12 @@
SELECT uniq(number >= 10 ? number : NULL) FROM numbers(10);
SELECT uniqExact(number >= 10 ? number : NULL) FROM numbers(10);
SELECT count(DISTINCT number >= 10 ? number : NULL) FROM numbers(10);
SELECT uniq(number >= 5 ? number : NULL) FROM numbers(10);
SELECT uniqExact(number >= 5 ? number : NULL) FROM numbers(10);
SELECT count(DISTINCT number >= 5 ? number : NULL) FROM numbers(10);
SELECT count(NULL);
-- These two returns NULL for now, but we want to change them to return 0.
SELECT uniq(NULL);
SELECT count(DISTINCT NULL);