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Merge pull request #22063 from ClickHouse/tuple-null-in

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Allow to search tuple of NULLs in a set
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alexey-milovidov 2021-03-25 15:59:41 +03:00 committed by GitHub
commit 37a4f3ab3a
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3 changed files with 9 additions and 0 deletions
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5
src/Interpreters/convertFieldToType.cpp
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@ -377,6 +377,11 @@ Field convertFieldToType(const Field & from_value, const IDataType & to_type, co
else if (const auto * nullable_type = typeid_cast<const DataTypeNullable *>(&to_type))
{
const IDataType & nested_type = *nullable_type->getNestedType();
/// NULL remains NULL after any conversion.
if (WhichDataType(nested_type).isNothing())
return {};
if (from_type_hint && from_type_hint->equals(nested_type))
return from_value;
return convertFieldToTypeImpl(from_value, nested_type, from_type_hint);

2
tests/queries/0_stateless/01774_tuple_null_in.reference Normal file
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@ -0,0 +1,2 @@
0
0

2
tests/queries/0_stateless/01774_tuple_null_in.sql Normal file
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@ -0,0 +1,2 @@
SELECT (NULL, NULL) = (8, 0) OR (NULL, NULL) = (3, 2) OR (NULL, NULL) = (0, 0) OR (NULL, NULL) = (3, 1);
SELECT (NULL, NULL) IN ((NULL, 0), (3, 1), (3, 2), (8, 0), (NULL, NULL));