Fix: parse struct(...)[] type properly #4123
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@VaggelisD I think empty structs aren't allowed (context), for example
STRUCT<...>[]is invalid BigQuery. The logic I linked was problematic because we'd consume[]andvalueswould also be an empty list so we'd generate aCAST(STRUCT() AS STRUCT<...>)in DucKDB when trying to parse a type that is an array of structs.This is needed to fix TobikoData/sqlmesh#3129.