[Enhancement] add limit operator before union gather (backport #53102)

[mergify[bot]]

Why I'm doing:

baseline:

mysql>   select  to_bitmap(1) FROM TABLE(generate_series(0, 655350)) union all select bitmap_agg(lo_orderkey) from lineorder group by lo_linenumber limit 1;
+--------------+
| to_bitmap(1) |
+--------------+
| NULL         |
+--------------+
1 row in set (7.42 sec)

patched:

mysql> select  to_bitmap(1) FROM TABLE(generate_series(0, 655350)) union all select bitmap_agg(lo_orderkey) from lineorder group by lo_linenumber limit 1;
+--------------+
| to_bitmap(1) |
+--------------+
| NULL         |
+--------------+
1 row in set (0.04 sec)

What I'm doing:

Fixes #issue

What type of PR is this:

• [ ] BugFix
• [ ] Feature
• [x] Enhancement
• [ ] Refactor
• [ ] UT
• [ ] Doc
• [ ] Tool

Does this PR entail a change in behavior?

• [ ] Yes, this PR will result in a change in behavior.
• [x] No, this PR will not result in a change in behavior.

If yes, please specify the type of change:

• [ ] Interface/UI changes: syntax, type conversion, expression evaluation, display information
• [ ] Parameter changes: default values, similar parameters but with different default values
• [ ] Policy changes: use new policy to replace old one, functionality automatically enabled
• [ ] Feature removed
• [ ] Miscellaneous: upgrade & downgrade compatibility, etc.

Checklist:

• [x] I have added test cases for my bug fix or my new feature
• [ ] This pr needs user documentation (for new or modified features or behaviors)
  • [ ] I have added documentation for my new feature or new function
• [x] This is a backport pr

Bugfix cherry-pick branch check:

• [x] I have checked the version labels which the pr will be auto-backported to the target branch
  • [x] 3.4
  • [x] 3.3
  • [ ] 3.2
  • [ ] 3.1
  • [ ] 3.0

    ---

    This is an automatic backport of pull request #53102 done by Mergify.

    Why I'm doing:

    baseline:

    mysql>   select  to_bitmap(1) FROM TABLE(generate_series(0, 655350)) union all select bitmap_agg(lo_orderkey) from lineorder group by lo_linenumber limit 1;
    +--------------+
    | to_bitmap(1) |
    +--------------+
    | NULL         |
    +--------------+
    1 row in set (7.42 sec)

    patched:

    mysql> select  to_bitmap(1) FROM TABLE(generate_series(0, 655350)) union all select bitmap_agg(lo_orderkey) from lineorder group by lo_linenumber limit 1;
    +--------------+
    | to_bitmap(1) |
    +--------------+
    | NULL         |
    +--------------+
    1 row in set (0.04 sec)

What I'm doing:

Fixes #issue

What type of PR is this:

• [ ] BugFix
• [ ] Feature
• [x] Enhancement
• [ ] Refactor
• [ ] UT
• [ ] Doc
• [ ] Tool

Does this PR entail a change in behavior?

• [ ] Yes, this PR will result in a change in behavior.
• [x] No, this PR will not result in a change in behavior.

If yes, please specify the type of change:

• [ ] Interface/UI changes: syntax, type conversion, expression evaluation, display information
• [ ] Parameter changes: default values, similar parameters but with different default values
• [ ] Policy changes: use new policy to replace old one, functionality automatically enabled
• [ ] Feature removed
• [ ] Miscellaneous: upgrade & downgrade compatibility, etc.

Checklist:

• [x] I have added test cases for my bug fix or my new feature
• [ ] This pr needs user documentation (for new or modified features or behaviors)
  • [ ] I have added documentation for my new feature or new function
• [x] This is a backport pr