gengliangwang commented on code in PR #51236:
URL: https://github.com/apache/spark/pull/51236#discussion_r2162439298
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sql/api/src/main/scala/org/apache/spark/sql/functions.scala:
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@@ -764,6 +764,66 @@ object functions {
hll_union_agg(Column(columnName))
}
+ /**
+ * Aggregate function: returns approximate top k (i.e., k-most-frequent)
items of a column,
+ * using Frequent Items Sketches from Apache DataSketches
+ *
+ * @group agg_funcs
+ * @since 4.1.0
+ */
+ def approx_top_k(e: Column, k: Int, maxItemsTracked: Int): Column =
Review Comment:
@yhuang-db shall we skip changing this file in this PR? We can decide
whether to add new DataFrame operations in a follow-up PR
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