dongjoon-hyun edited a comment 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-462110894 Oh, is that a problem? Then, please use the following examples. * `collect_list`, `collect_set` ```sql spark-sql> SELECT collect_set(col) FROM VALUES (1), (2), (1) AS tab(col); [1,2] spark-sql> SELECT collect_list(col) FROM VALUES (1), (2), (1) AS tab(col); [1,2,1] ``` * `std (=stddev_samp)`, `stddev_pop` ```sql spark-sql> SELECT stddev_samp(col) FROM VALUES (1), (2), (3) AS tab(col); 1.0 spark-sql> SELECT stddev_pop(col) FROM VALUES (1), (2), (3) AS tab(col); 0.816496580927726 ``` * `variance (=var_samp)`, `var_pop` ```sql spark-sql> SELECT var_samp(col) FROM VALUES (1), (2), (3) AS tab(col); 1.0 spark-sql> SELECT var_pop(col) FROM VALUES (1), (2), (3) AS tab(col); 0.6666666666666666 ``` * `covar_samp`, `covar_pop` ```sql spark-sql> SELECT covar_samp(c1,c2) FROM VALUES (1,1), (2,2), (3,3) AS tab(c1,c2); 1.0 spark-sql> SELECT covar_pop(c1,c2) FROM VALUES (1,1), (2,2), (3,3) AS tab(c1,c2); 0.6666666666666666 ``` * `percentile` ```sql spark-sql> SELECT percentile(col, 0.3) FROM VALUES (0), (10) AS tab(col); 3.0 spark-sql> SELECT percentile(col, array(0.25,0.75)) FROM VALUES (0), (10) AS tab(col); [2.5,7.5] ``` For the other functions, please reuse the example in [window.sql](https://github.com/apache/spark/blob/master/sql/core/src/test/resources/sql-tests/inputs/window.sql#L58-L87). You don't need to reinvent the example. Let's finish all in this PR.
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