expression: fix incorrect implementation in builtinRealIsFalseSig

[qw4990]

What problem does this PR solve?

Issue Number: close #18674

Problem Summary: fix incorrect implementation in builtinRealIsFalseSig

What is changed and how it works?

Fix incorrect implementation in builtinRealIsFalseSig.

The type of its child is Real, but when checking false values, it regards them as Int incorrectly.

Check List

Tests

• Unit test

Release note

• expression: fix incorrect implementation in builtinRealIsFalseSig

[XuHuaiyu]

LGTM

[SunRunAway]

mysql> select -1.0 % -1.0;
+-------------+
| -1.0 % -1.0 |
+-------------+
|        -0.0 |
+-------------+
1 row in set (0.00 sec)

Please fix this issue too.

[qw4990]

mysql> select -1.0 % -1.0;
+-------------+
| -1.0 % -1.0 |
+-------------+
|        -0.0 |
+-------------+
1 row in set (0.00 sec)

Please fix this issue too.

OK

[SunRunAway]

LGTM

[qw4990]

/merge

[ti-srebot]

Your auto merge job has been accepted, waiting for:

• 19547
• 19640

[qw4990]

/merge

[ti-srebot]

/run-all-tests

[ti-srebot]

@qw4990 merge failed.

[ti-srebot]

/run-all-tests

[ti-srebot]

cherry pick to release-4.0 in PR #19670