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Revert "Revert #27787"

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This reverts commit c1cc04d44d.
This commit is contained in:
Nikolai Kochetov 2022-10-18 14:00:50 +00:00
parent 29513f6a1f
commit a5711fda44
1 changed files with 2 additions and 2 deletions
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4
src/Storages/AlterCommands.cpp
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@ -755,9 +755,9 @@ bool isMetadataOnlyConversion(const IDataType * from, const IDataType * to)
const auto * nullable_from = typeid_cast<const DataTypeNullable *>(from);
const auto * nullable_to = typeid_cast<const DataTypeNullable *>(to);
if (nullable_from && nullable_to)
if (nullable_to)
{
from = nullable_from->getNestedType().get();
from = nullable_from ? nullable_from->getNestedType().get() : from;
to = nullable_to->getNestedType().get();
continue;
}