alamb opened a new issue #182: URL: https://github.com/apache/arrow-rs/issues/182
*Note*: migrated from original JIRA: https://issues.apache.org/jira/browse/ARROW-11618 There is currently no way to select a column by its path, e.g. 'a.b.c'. We have to select the column by its index, which is not trivial for nested structures. For example, if a record has the following schema, the column indices are shown in parentheses: {code} schema: a [struct] ("a") b [struct] ("a.b") c [int32] ("a.b.c") [0] d [struct] ("a.b.d") e [int32] ("a.b.d.e") [1] f [bool] ("a.b.d.f") [2] g [int64] ("a.b.g") [3] {code} if one wants to select 'a.b', they need to know that 'a.b.d' spans 2 (1 to 2) columns. This is inconvenient, and potentially forces readers to read whole records to avoid this inconvenience. A string-based projection could allow one to select columns 1 and 2 via "a.b.d" or column 2 via "a.b.g" -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
