Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/16233#discussion_r95061267
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -767,7 +857,45 @@ class Analyzer(
}
}
- /**
+ /**
+ * Alias the output of a view's child to the output of the view, the
corresponding attribute is
+ * searched by name. If the corresponding attribute is not found, throw
an AnalysisException.
+ * On the resolution of the view, the output attributes are generated
from the view schema, and
+ * the view query is resolved later. After the view attributes have been
stabilized(when the
+ * resolution batch has finished), we add a Project operator over the
child, so that we could
+ * alias the output of the child plan to the view's output attributes.
+ * TODO: Also check the dataTypes and nullabilites of the output.
--- End diff --
top level attributes are always null right?
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