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I explored the following problem:
```yql
PRAGMA YqlSelect = 'force';
/* BAD */ SELECT (SELECT * FROM (SELECT 1 AS a) AS x);
/* OK */ SELECT (SELECT * FROM (SELECT 1 AS a) AS x);
FROM (VALUES (1)) AS y (b);
```
There was a fatal error of not found qualified column name in a list of
unqualified column names, or vice versa. The condition for qualification
was dependent on a fact of SubLink type annotation. But initially
columns are qualified depending on existence of an external input.
Actually it seems that the existence of an external input is a right
condition for column qualification.
commit_hash:d03011a0f70ee94bf05418326cd4b6c655c5999f
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