bindings with ignore_plan_cache_hint cannot work

[qw4990]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

-- enable the plan-cache --
create table t (a int);
create binding for select * from t using select /*+ ignore_plan_cache() */ * from t;
prepare stmt from 'select * from t';
execute stmt;
execute stmt;
select @@last_plan_from_cache;

2. What did you expect to see? (Required)

The second execute-stmt cannot hit the cache since we create a binding with ignore_plan_cache() for it.

3. What did you see instead (Required)

It can hit the cache.

4. What is your TiDB version? (Required)

Master

[qw4990]

PTAL @fzzf678

[fzzf678]

/assign @fzzf678

[glkappe]

do we have any plans to fix this

[fzzf678]

do we have any plans to fix this

I'm working on it