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

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gengliqi opened this issue Nov 12, 2024 · 0 comments · Fixed by #9606
Closed

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

gengliqi opened this issue Nov 12, 2024 · 0 comments · Fixed by #9606
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affects-8.5 This bug affects the 8.5.x(LTS) versions. severity/major type/bug The issue is confirmed as a bug.

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@gengliqi
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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))).
@gengliqi gengliqi added type/bug The issue is confirmed as a bug. severity/major affects-8.5 This bug affects the 8.5.x(LTS) versions. labels Nov 12, 2024
@gengliqi gengliqi mentioned this issue Nov 12, 2024
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@ti-chi-bot ti-chi-bot bot closed this as completed in e591694 Nov 13, 2024
@ti-chi-bot ti-chi-bot mentioned this issue Nov 13, 2024
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ti-chi-bot bot pushed a commit that referenced this issue Nov 13, 2024
@ti-chi-bot @gengliqi
Fix the bug that cloneFullColumn does not clone the subcolumns at t…
d346b92 
…he second and higher levels (#9606) (#9607)

close #9605

Fix the bug that `cloneFullColumn` does not clone the subcolumns at the second and higher levels

Signed-off-by: gengliqi <gengliqiii@gmail.com>

Co-authored-by: gengliqi <gengliqiii@gmail.com>
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affects-8.5 This bug affects the 8.5.x(LTS) versions. severity/major type/bug The issue is confirmed as a bug.
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@gengliqi