executor: fix get var expr when session var is hex literal (#23241)

[ti-srebot]

cherry-pick #23241 to release-5.0
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---

Signed-off-by: guo-shaoge shaoge1994@163.com

What problem does this PR solve?

Issue Number: close #22949

Problem Summary:

use test;
DROP TABLE IF EXISTS `IDT_MC10146`;
CREATE TABLE `IDT_MC10146` (
  `COL1` bit(4) DEFAULT NULL,
  `COL2` bit(4) DEFAULT NULL,
  `COL3` bit(4) DEFAULT NULL,
  KEY `U_M_COL` (`COL1`,`COL2`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;
INSERT INTO `IDT_MC10146` VALUES (0x0F, 0x00, 0x08);
prepare stmt from 'select * from IDT_MC10146 where col1 in (?);';
set @a=0x3135;
execute stmt using@a;

GetVar expr(@sess_var) return string type when session_var is hex literal(eg: @sess_var = 0x3135), which is converted to '15'. Actually we should return BinaryLiteral type, but we dont have BinaryLiteral eval type.

What is changed and how it works?

What's Changed:

1. When UsingVar is GetVar expr and this session var is BinaryLiteral, we convert the result of GetVar (string) back to BinaryLiteral.
2. Before rewrite IN expr to EQ expr, check if contain mutalbe variables.

Related changes

• Need to cherry-pick to the release branch

Check List

Tests

• Integration test: expression.TestGetVarExprWithHexLiteral()

• Side effects: no

Release note

• fix get var expr when session var is hex literal

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• XuHuaiyu
• lzmhhh123

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[ti-srebot]

/run-all-tests

[ti-srebot]

@guo-shaoge you're already a collaborator in bot's repo.

[guo-shaoge]

This PR fixed a unstable case. Looks like not cherry pick.

[guo-shaoge]

/run-check_dev

[guo-shaoge]

/run-integration-common-test
/run-common-test
/run-integration-copr-test

[XuHuaiyu]

LGTM

[lzmhhh123]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: dd5ba4a

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