cloud-fan commented on a change in pull request #31613:
URL: https://github.com/apache/spark/pull/31613#discussion_r581633880
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File path: sql/core/src/test/resources/sql-tests/results/postgreSQL/join.sql.out
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@@ -3225,7 +3225,7 @@ select * from
struct<>
-- !query output
org.apache.spark.sql.AnalysisException
-Reference 'f1' is ambiguous, could be: j.f1, j.f1.; line 2 pos 63
+Reference 'f1' is ambiguous, could be: j.f1#x, j.f1#x.; line 2 pos 63
Review comment:
It doesn't help because end-users can't specify attr id when referring
to the column. If a table/relation has duplicated column names, I think the
only way out is to get the column by position, e.g.
`df.select(Column(df.logicalPlan.output(2)))`, and attr id doesn't matter.
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