Hanumath Rao Maduri created DRILL-6431:
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Summary: Unnest operator requires table and a single column alias
to be specified.
Key: DRILL-6431
URL: https://issues.apache.org/jira/browse/DRILL-6431
Project: Apache Drill
Issue Type: Bug
Components: Query Planning & Optimization, SQL Parser
Reporter: Hanumath Rao Maduri
Assignee: Hanumath Rao Maduri
Fix For: 1.14.0
Currently, unnest operator is not required to specify alias neither for table
name nor column name. This has some implications on what name the unnest
operator output column should use. One can use a common name like "unnest" as
the output name. It means, customers need to be educated on what to expect from
unnest operator. This might confuse some customers and also prone to introduce
errors in the query.
The design decision for DRILL is that unnest always produces either a scalar
column or a map (depending upon the input schema for it), but it is always a
single column.
Given this scenario, it is better to enforce the requirement that unnest
operator requires a table alias and a column alias(single column). This can
help to disambiguate the column and further can easily be referenced in the
query.
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