AMC-hawk commented on code in PR #58760:
URL: https://github.com/apache/spark/pull/58760#discussion_r4328750475
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala:
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@@ -2085,6 +2086,47 @@ class Analyzer(
}.map(_.asInstanceOf[NamedExpression])
}
+ /**
+ * The SQL pipe SET operator is implemented as a star expansion that
excludes the assigned
+ * column and appends a replacement of the same name. That drops the
original attribute from
+ * the project list, which would also make it unreachable through its
table alias, contradicting
+ * the documented behavior that table aliases keep referring to the
original row values after an
+ * assignment. Retain the excluded attributes as hidden output instead,
the same way USING joins
+ * hide their duplicated join keys (SPARK-59146).
+ *
+ * The hidden output holds the whole qualified source row, with every
position in its original
+ * order, not just the excluded attributes, because a qualified star
expands hidden output
+ * ahead of the visible output. Retaining only the excluded attributes
would move them to the
+ * front, so that `VALUES (1, 2, 3) AS t(a, b, c) |> SET b = 20 |> SELECT
t.*` returned
Review Comment:
Fixed in 5545d0d: it now reads "would return (b, a, c)".
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