feat(expr): support user-defined CAST and TRY_CAST
#6663
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sundy-li
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Jul 20, 2022
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Summary
CASTandTRY_CASTCASTwill abort the execution and throw an error,TRY_CASTwill just silently replace that single scalar with NULL.TRY_CASTwill wrap its dest type into nullable. For example, the return type ofTRY_CAST(a AS Int8)isInt8 NULL, and the return type ofTRY_CAST(a AS Array(Int8))isArray(Int8 NULL) NULL.Tracked in #6547