fix(tinmu): fix tianmu crash when set varchar to num when order by

[adofsauron]

由于crash的问题过于严重，优先避免crash。
随后立即开始着手修复tianm查询树上对于给数字类型赋值字符串的在order by操作符上的问题

Summary about this PR

Issue Number: close #1792

Tests Check List

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