Update variant_get to allow optional type
#17
Merged
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closes #16
We only rely on
type_name.parse::<DataType>()to decide whether a type string is valid, I think this is consistent with thearrow_castbehavior in datafusion: https://github.com/apache/datafusion/blob/377c0fce481d561d58e3a6fad2dca18cb1d58384/datafusion/functions/src/core/arrow_cast.rs#L143-L147Added a few more test cases along the way.