BigQuery mistakenly flattens on nested field when it's not referenced about google-bigquery

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Hi, you've stumbled into an oddity of the existing BigQuery SQL dialect. Try:

SELECT 
    doctor.dr_id AS doctor_dr_id,
FROM [rsdw.doctor] doctor 
WHERE
  doctor.is_published
  AND doctor.specialties.specialty = 'Plastic Surgeon'
LIMIT 500

The sub-select `(SELECT * FROM rsdw.doctor)` is evaluated in a way that makes 
the other repeated fields visible at top-scope, even if not included in the 
query results. You can either remove the SELECT * sub-select as in my example, 
or explicitly sub-select the fields you desire from the underlying table.

Also note that we're working on an improved SQL dialect that will better handle 
"pushing down" the outer-selected fields into the inner sub-select, see issue 
448. I'll close this as "WontFix", but we'll improve the behavior soon.

Original comment by [email protected] on 8 Apr 2016 at 3:42

• Changed state: WontFix