Karen Feng created SPARK-34527:
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Summary: De-duplicated common columns cannot be resolved from
USING/NATURAL JOIN
Key: SPARK-34527
URL: https://issues.apache.org/jira/browse/SPARK-34527
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.0.0
Reporter: Karen Feng
USING/NATURAL JOINS today have unexpectedly asymmetric behavior when resolving
the duplicated common columns. For example, the left key columns can be
resolved from a USING INNER JOIN, but the right key columns cannot. This is due
to the Analyzer's
[rewrite|https://github.com/apache/spark/blob/999d3b89b6df14a5ccb94ffc2ffadb82964e9f7d/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala#L3397]
of NATURAL/USING JOINs, which uses Project to remove the duplicated common
columns.
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