[GitHub] [spark] beliefer commented on a change in pull request #28134: [SPARK-31358][SQL][DOC] Document FILTER clauses of aggregate functions in SQL references

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beliefer commented on a change in pull request #28134: [SPARK-31358][SQL][DOC] Document FILTER clauses of aggregate functions in SQL references
URL: https://github.com/apache/spark/pull/28134#discussion_r404131336
 
 

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 File path: docs/sql-ref-syntax-qry-select-groupby.md
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 @@ -70,6 +76,19 @@ GROUP BY GROUPING SETS (grouping_set [ , ...])
     ((warehouse, product), (warehouse), (product), ())</code>.
     The N elements of a <code>CUBE</code> specification results in 2^N <code>GROUPING SETS</code>.
   </dd>
+  <dt><code><em>aggregate_name</em></code></dt>
+  <dd>
+    Specifies an aggregate function name (MIN, MAX, COUNT, SUM, AVG, etc.).
+  </dd>
+  <dt><code><em>DISTINCT</em></code></dt>
+  <dd>
+    Removes duplicates in input rows before they are passed to aggregate functions.
+  </dd>
+  <dt><code><em>FILTER</em></code></dt>
+  <dd>
+    Filters the input rows for which the <code>boolean_expression</code> in the <code>WHERE</code> clause evaluates
 
 Review comment:
   Could we change <code>WHERE</code> to <code>FILTER</code>.
   Because WHERE clause causes confusion.

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