[GitHub] dongjoon-hyun commented on issue #23756: [SPARK-26853][SQL] Add example and version for commonly used aggregate function descriptions

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dongjoon-hyun commented on issue #23756: [SPARK-26853][SQL] Add example and version for commonly used aggregate function descriptions
URL: https://github.com/apache/spark/pull/23756#issuecomment-462106262
 
 
   @dilipbiswal . As we know, here is [a list of registered aggregation functions](https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala#L280-L312).
   
   Since this PR touchs `approx_percentile`, can we update `approx_count_distinct`, too? In general, the followings are commonly used, too.
   
   - `collect_list`, `collect_set`
   - `std (=stddev_samp)`, `stddev_pop`
   - `variance (=var_samp)`, `var_pop`
   - `covar_samp`, `covar_pop`
   - `percentile`
   
   I'm wondering if you can review the list and add examples for all aggregation functions for Apache Spark 3.0.0. How do you think about that?

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