Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/22788#discussion_r227203199
--- Diff:
sql/core/src/test/resources/sql-tests/results/columnresolution-negative.sql.out
---
@@ -81,7 +81,7 @@ SELECT t1.i1 FROM t1, mydb1.t1
struct<>
-- !query 9 output
org.apache.spark.sql.AnalysisException
-Reference 't1.i1' is ambiguous, could be: mydb1.t1.i1, mydb1.t1.i1.; line
1 pos 7
+Reference '`t1`.`i1`' is ambiguous, could be: mydb1.t1.i1, mydb1.t1.i1.;
line 1 pos 7
--- End diff --
These examples only make sense when we have the outer backticks. e.g.
`'t1.i1'` is good.
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