[CH-431] not change columns to nulllable in expand operator

Kyligence / ClickHouse

ClickHouse® is a free analytics DBMS for big data

https://clickhouse.com

Apache License 2.0

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[CH-431] not change columns to nulllable in expand operator #433

Open shuai-xu opened 1 year ago

shuai-xu commented 1 year ago

Changelog category (leave one):

Bug Fix (user-visible misbehavior in official stable or prestable release)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

This pr fix the bug that columns type may be changed in expand operator, which will cause memory problem when serialize and deserialize them. This close #431 .

kyligence-git commented 1 year ago

Can one of the admins verify this patch?