问题
I have an sql query within impala select * from table but when I execute this certain columns are missing .
Whereas when I do describe table those columns are there.
I cannot show the snippet but the types not showing up are maps,arrays, and structs.
回答1:
Impala doesn't support that. Complex types have to be unpacked to be displayed.
The result set of an Impala query always contains all scalar types; the elements and fields within any complex type queries must be "unpacked" using join queries. A query cannot directly retrieve the entire value for a complex type column. Impala returns an error in this case. Queries using SELECT * are allowed for tables with complex types, but the columns with complex types are skipped.
Source: Queries and Complex Types
来源：https://stackoverflow.com/questions/41623711/impala-select-does-not-show-all-details-of-table