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cloneFullColumn does not clone the subcolumns at the second and higher levels #9605

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cloneFullColumn does not clone the subcolumns at the second and higher levels#9605
#9606
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affects-8.5This bug affects the 8.5.x(LTS) versions.severity/majortype/bugThe issue is confirmed as a bug.
@gengliqi

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@gengliqi
gengliqi
opened on Nov 12, 2024

Bug Report

tiflash/dbms/src/Columns/IColumn.h

Lines 418 to 423 in 750c4de

MutablePtr cloneFullColumn() const
{
MutablePtr res = clone();
res->forEachSubcolumn([](Ptr & subcolumn) { subcolumn = subcolumn->clone(); });
return res;
}

cloneFullColumn only clones the first-level subcolumn so the inner column data will be shared if the column has subcolumns at second and higher levels. For instance, ColumnNullable(ColumnArray(ColumnVector))).

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    affects-8.5This bug affects the 8.5.x(LTS) versions.severity/majortype/bugThe issue is confirmed as a bug.

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