If fucntion can't process enum type.

[wshwsh12]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

drop table t;
create table t(a int,b enum("b"),c enum("c"));
insert into t values(1,1,1),(2,1,1),(1,1,1),(2,1,1);
select if(A, null,b)=1 from t;

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

Get some result.

3. What did you see instead (Required)

ERROR 1105 (HY000): baseBuiltinFunc.vecEvalInt() should never be called, please contact the TiDB team for help

4. What is your TiDB version? (Required)

master, release-4.0, release-5.0

[ti-srebot]

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