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modify column datatype to Nullable(datatype) or Nullable(datatype) to Nullable(datatype) donot allways need mutations.

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This commit is contained in:
vicgao 2021-08-17 21:14:13 +08:00
parent b5610d9a83
commit c16bd25399
1 changed files with 3 additions and 0 deletions
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3
src/Storages/AlterCommands.cpp
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@ -679,6 +679,9 @@ bool isMetadataOnlyConversion(const IDataType * from, const IDataType * to)
while (true)
{
if (from->equals(*to))
return true;
auto it_range = ALLOWED_CONVERSIONS.equal_range(typeid(*from));
for (auto it = it_range.first; it != it_range.second; ++it)
{