Store NULL in scalar result map for empty subquery result

[vdimir]

Changelog category (leave one):

• Bug Fix (user-visible misbehavior in an official stable release)

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

• Fix column type for empty scalar sub-query result (that may lead to crash in some cases), close ClickHouse Server 23.7.1.857 terminated by Null Pointer Access after running a SQL statement #52057

[robot-ch-test-poll1]

This is an automated comment for commit ea1ab52 with description of existing statuses. It's updated for the latest CI running

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[novikd]

Seems you need to update one test

[novikd]

Test failures look to be related to the change.

[vdimir]

Test failures look to be related to the change.

Yes, thanks for pointing out, I'll jump on it

[novikd]

It seems test failures are unrelated but it's better to merge/rebase with the master.