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It seems hard to find a common pattern of checking types in `Expression`. Sometimes we know what input types we need(like `And`, we know we need two booleans), sometimes we just have some rules(like `Add`, we need 2 numeric types which are equal). So I defined a general interface `checkInputDataTypes` in `Expression` which returns a `TypeCheckResult`. `TypeCheckResult` can tell whether this expression passes the type checking or what the type mismatch is. This PR mainly works on apply input types checking for arithmetic and predicate expressions. TODO: apply type checking interface to more expressions. Author: Wenchen Fan <cloud0fan@outlook.com> Closes #6405 from cloud-fan/6444 and squashes the following commits: b5ff31b [Wenchen Fan] address comments b917275 [Wenchen Fan] rebase 39929d9 [Wenchen Fan] add todo 0808fd2 [Wenchen Fan] make constrcutor of TypeCheckResult private 3bee157 [Wenchen Fan] and decimal type coercion rule for binary comparison 8883025 [Wenchen Fan] apply type check interface to CaseWhen cffb67c [Wenchen Fan] to have resolved call the data type check function 6eaadff [Wenchen Fan] add equal type constraint to EqualTo 3affbd8 [Wenchen Fan] more fixes 654d46a [Wenchen Fan] improve tests e0a3628 [Wenchen Fan] improve error message 1524ff6 [Wenchen Fan] fix style 69ca3fe [Wenchen Fan] add error message and tests c71d02c [Wenchen Fan] fix hive tests 6491721 [Wenchen Fan] use value class TypeCheckResult 7ae76b9 [Wenchen Fan] address comments cb77e4f [Wenchen Fan] Improve error reporting for expression data type mismatch |
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