GuoPhilipse commented on a change in pull request #29056:
URL: https://github.com/apache/spark/pull/29056#discussion_r455176092
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File path: docs/sql-ref-syntax-qry-select.md
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@@ -74,6 +74,12 @@ SELECT [ hints , ... ] [ ALL | DISTINCT ] { named_expression
[ , ... ] }
An expression with an assigned name. In general, it denotes a column
expression.
**Syntax:** `expression [AS] [alias]`
+
+ * **FROM**
Review comment:
have added the basic defintion, i saw there was `from_item` already in
it.
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