Move kurtosis_pop to datafusion-functions-extra and out of core (#12647)

Co-authored-by: Dharan Aditya <[email protected]>

Author: dharanad

datafusion/functions-aggregate/src/kurtosis_pop.rs

@@ -78,7 +78,6 @@ pub mod average;
 pub mod bit_and_or_xor;
 pub mod bool_and_or;
 pub mod grouping;
-pub mod kurtosis_pop;
 pub mod nth_value;
 pub mod string_agg;
 
@@ -171,7 +170,6 @@ pub fn all_default_aggregate_functions() -> Vec<Arc<AggregateUDF>> {
         average::avg_udaf(),
         grouping::grouping_udaf(),
         nth_value::nth_value_udaf(),
-        kurtosis_pop::kurtosis_pop_udaf(),
     ]
 }
 

datafusion/functions-aggregate/src/lib.rs

@@ -73,7 +73,6 @@ use datafusion_functions_aggregate::expr_fn::{
     approx_distinct, array_agg, avg, bit_and, bit_or, bit_xor, bool_and, bool_or, corr,
     nth_value,
 };
-use datafusion_functions_aggregate::kurtosis_pop::kurtosis_pop;
 use datafusion_functions_aggregate::string_agg::string_agg;
 use datafusion_functions_window_common::field::WindowUDFFieldArgs;
 use datafusion_proto::bytes::{
@@ -938,7 +937,6 @@ async fn roundtrip_expr_api() -> Result<()> {
             vec![lit(10), lit(20), lit(30)],
         ),
         row_number(),
-        kurtosis_pop(lit(1)),
         nth_value(col("b"), 1, vec![]),
         nth_value(
             col("b"),

datafusion/proto/tests/cases/roundtrip_logical_plan.rs

@@ -5862,64 +5862,3 @@ ORDER BY k;
 ----
 1 1.8125 6.8007813 Float16 Float16
 2 8.5 8.5 Float16 Float16
-
-# The result is 0.19432323191699075 actually
-query R
-SELECT kurtosis_pop(col) FROM VALUES (1), (10), (100), (10), (1) as tab(col);
-----
-0.194323231917
-
-# The result is -1.153061224489787 actually
-query R
-SELECT kurtosis_pop(col) FROM VALUES (1), (2), (3), (2), (1) as tab(col);
-----
--1.15306122449
-
-query R
-SELECT kurtosis_pop(col) FROM VALUES (1.0), (10.0), (100.0), (10.0), (1.0) as tab(col);
-----
-0.194323231917
-
-query R
-SELECT kurtosis_pop(col) FROM VALUES ('1'), ('10'), ('100'), ('10'), ('1') as tab(col);
-----
-0.194323231917
-
-query R
-SELECT kurtosis_pop(col) FROM VALUES (1.0) as tab(col);
-----
-NULL
-
-query R
-SELECT kurtosis_pop(1)
-----
-NULL
-
-query R
-SELECT kurtosis_pop(1.0)
-----
-NULL
-
-query R
-SELECT kurtosis_pop(null)
-----
-NULL
-
-statement ok
-CREATE TABLE t1(c1 int);
-
-query R
-SELECT kurtosis_pop(c1) FROM t1;
-----
-NULL
-
-statement ok
-INSERT INTO t1 VALUES (1), (10), (100), (10), (1);
-
-query R
-SELECT kurtosis_pop(c1) FROM t1;
-----
-0.194323231917
-
-statement ok
-DROP TABLE t1;

datafusion/sqllogictest/test_files/aggregate.slt

@@ -252,7 +252,6 @@ last_value(expression [ORDER BY expression])
 - [regr_sxx](#regr_sxx)
 - [regr_syy](#regr_syy)
 - [regr_sxy](#regr_sxy)
-- [kurtosis_pop](#kurtosis_pop)
 
 ### `corr`
 
@@ -528,19 +527,6 @@ regr_sxy(expression_y, expression_x)
 - **expression_x**: Independent variable.
   Can be a constant, column, or function, and any combination of arithmetic operators.
 
-### `kurtosis_pop`
-
-Computes the excess kurtosis (Fisher’s definition) without bias correction.
-
-```
-kurtois_pop(expression)
-```
-
-#### Arguments
-
-- **expression**: Expression to operate on.
-  Can be a constant, column, or function, and any combination of arithmetic operators.
-
 ## Approximate
 
 - [approx_distinct](#approx_distinct)