GuoPhilipse commented on a change in pull request #29056:
URL: https://github.com/apache/spark/pull/29056#discussion_r455576141
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File path: docs/sql-ref-syntax-qry.md
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@@ -45,4 +45,7 @@ ability to generate logical and physical plan for a given
query using
* [TABLESAMPLE](sql-ref-syntax-qry-select-sampling.html)
* [Table-valued Function](sql-ref-syntax-qry-select-tvf.html)
* [Window Function](sql-ref-syntax-qry-select-window.html)
+ * [CASE Clause](sql-ref-syntax-qry-select-case.html)
Review comment:
I checked docs in hive and mysql, both of them singlely define `CASE` as
function, and not defined together with `SELECT` clause.i have put the `CASE`
example link in other `select` docs.
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF
https://dev.mysql.com/doc/refman/8.0/en/control-flow-functions.html
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