ifilonenko
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+--
+-- Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
+--
+--
+-- AGGREGATES [Part 1]
+-- https://github.com/postgres/postgres/blob/REL_12_BETA1/src/test/regress/sql/aggregates.sql#L1-L143
+
+-- avoid bit-exact output here because operations may not be bit-exact.
+-- SET extra_float_digits = 0;
+
+-- This test file was converted from pgSQL/aggregates_part1.sql.
+-- Note that currently registered UDF returns a string. So there are some differences, for instance
+-- in string cast within UDF in Scala and Python.
+
+SELECT avg(udf(four)) AS avg_1 FROM onek;
+
+SELECT udf(avg(a)) AS avg_32 FROM aggtest WHERE a < 100;
+
+-- In 7.1, avg(float4) is computed using float8 arithmetic.
+-- Round the result to 3 digits to avoid platform-specific results.
+
+select CAST(avg(udf(b)) AS Decimal(10,3)) AS avg_107_943 FROM aggtest;
+-- `student` has a column with data type POINT, which is not supported by Spark [SPARK-27766]
+-- SELECT avg(gpa) AS avg_3_4 FROM ONLY student;
+
+SELECT sum(udf(four)) AS sum_1500 FROM onek;
+SELECT udf(sum(a)) AS sum_198 FROM aggtest;
+SELECT udf(udf(sum(b))) AS avg_431_773 FROM aggtest;
+-- `student` has a column with data type POINT, which is not supported by Spark [SPARK-27766]
+-- SELECT sum(gpa) AS avg_6_8 FROM ONLY student;
+
+SELECT udf(max(four)) AS max_3 FROM onek;
+SELECT max(udf(a)) AS max_100 FROM aggtest;
+SELECT CAST(udf(udf(max(aggtest.b))) AS int) AS max_324_78 FROM aggtest;
+-- `student` has a column with data type POINT, which is not supported by Spark [SPARK-27766]
+-- SELECT max(student.gpa) AS max_3_7 FROM student;
+
+SELECT CAST(stddev_pop(udf(b)) AS int) FROM aggtest;
+SELECT udf(stddev_samp(b)) FROM aggtest;
+SELECT CAST(var_pop(udf(b)) as int) FROM aggtest;
+SELECT udf(var_samp(b)) FROM aggtest;
+
+SELECT udf(stddev_pop(CAST(b AS Decimal(38,0)))) FROM aggtest;
+SELECT stddev_samp(CAST(udf(b) AS Decimal(38,0))) FROM aggtest;
+SELECT udf(var_pop(CAST(b AS Decimal(38,0)))) FROM aggtest;
+SELECT var_samp(udf(CAST(b AS Decimal(38,0)))) FROM aggtest;
+
+-- population variance is defined for a single tuple, sample variance
+-- is not
+SELECT udf(var_pop(1.0)), var_samp(udf(2.0));
+SELECT stddev_pop(udf(CAST(3.0 AS Decimal(38,0)))), stddev_samp(CAST(udf(4.0) AS Decimal(38,0)));
+
+
+-- verify correct results for null and NaN inputs
+select sum(udf(CAST(null AS int))) from range(1,4);
+select sum(udf(CAST(null AS long))) from range(1,4);
+select sum(udf(CAST(null AS Decimal(38,0)))) from range(1,4);
+select sum(udf(CAST(null AS DOUBLE))) from range(1,4);
+select avg(udf(CAST(null AS int))) from range(1,4);
+select avg(udf(CAST(null AS long))) from range(1,4);
+select avg(udf(CAST(null AS Decimal(38,0)))) from range(1,4);
+select avg(udf(CAST(null AS DOUBLE))) from range(1,4);
+select sum(CAST(udf('NaN') AS DOUBLE)) from range(1,4);
+select avg(CAST(udf('NaN') AS DOUBLE)) from range(1,4);
+
+-- [SPARK-27768] verify correct results for infinite inputs
+-- [SPARK-28291] UDFs cannot be evaluated within inline table definition
+-- SELECT avg(CAST(x AS DOUBLE)), var_pop(CAST(x AS DOUBLE))
+-- FROM (VALUES (CAST(udf('1') AS DOUBLE)), (CAST(udf('Infinity') AS DOUBLE))) v(x);
+SELECT avg(CAST(udf(x) AS DOUBLE)), var_pop(CAST(udf(x) AS DOUBLE))
+FROM (VALUES ('Infinity'), ('1')) v(x);
+SELECT avg(CAST(udf(x) AS DOUBLE)), var_pop(CAST(udf(x) AS DOUBLE))
+FROM (VALUES ('Infinity'), ('Infinity')) v(x);
+SELECT avg(CAST(udf(x) AS DOUBLE)), var_pop(CAST(udf(x) AS DOUBLE))
+FROM (VALUES ('-Infinity'), ('Infinity')) v(x);
+
+
+-- test accuracy with a large input offset
+SELECT avg(udf(CAST(x AS DOUBLE))), udf(var_pop(CAST(x AS DOUBLE)))
+FROM (VALUES (100000003), (100000004), (100000006), (100000007)) v(x);
+SELECT avg(udf(CAST(x AS DOUBLE))), udf(var_pop(CAST(x AS DOUBLE)))
+FROM (VALUES (7000000000005), (7000000000007)) v(x);
+
+-- SQL2003 binary aggregates [SPARK-23907]
+-- SELECT regr_count(b, a) FROM aggtest;
+-- SELECT regr_sxx(b, a) FROM aggtest;
+-- SELECT regr_syy(b, a) FROM aggtest;
+-- SELECT regr_sxy(b, a) FROM aggtest;
+-- SELECT regr_avgx(b, a), regr_avgy(b, a) FROM aggtest;
+-- SELECT regr_r2(b, a) FROM aggtest;
+-- SELECT regr_slope(b, a), regr_intercept(b, a) FROM aggtest;
+SELECT CAST(udf(covar_pop(b, udf(a))) AS int), CAST(covar_samp(udf(b), a) as int) FROM aggtest;
+SELECT corr(b, udf(a)) FROM aggtest;
+
+
+-- test accum and combine functions directly [SPARK-23907]
+-- CREATE TABLE regr_test (x float8, y float8);
+-- INSERT INTO regr_test VALUES (10,150),(20,250),(30,350),(80,540),(100,200);
+-- SELECT count(*), sum(x), regr_sxx(y,x), sum(y),regr_syy(y,x), regr_sxy(y,x)
+-- FROM regr_test WHERE x IN (10,20,30,80);
+-- SELECT count(*), sum(x), regr_sxx(y,x), sum(y),regr_syy(y,x), regr_sxy(y,x)
+-- FROM regr_test;
+-- SELECT float8_accum('{4,140,2900}'::float8[], 100);
+-- SELECT float8_regr_accum('{4,140,2900,1290,83075,15050}'::float8[], 200, 100);
+-- SELECT count(*), sum(x), regr_sxx(y,x), sum(y),regr_syy(y,x), regr_sxy(y,x)
+-- FROM regr_test WHERE x IN (10,20,30);
+-- SELECT count(*), sum(x), regr_sxx(y,x), sum(y),regr_syy(y,x), regr_sxy(y,x)
+-- FROM regr_test WHERE x IN (80,100);
+-- SELECT float8_combine('{3,60,200}'::float8[],ELECT CAST(udf(covar_pop(b, udf(a))) AS '{0,0,0}'::float8[]);
+-- SELECT float8_combine('{0,0,0}'::float8[], '{2,180,200}'::float8[]);
+-- SELECT float8_combine('{3,60,200}'::float8[], '{2,180,200}'::float8[]);
+-- SELECT float8_regr_combine('{3,60,200,750,20000,2000}'::float8[],
+--                            '{0,0,0,0,0,0}'::float8[]);
+-- SELECT float8_regr_combine('{0,0,0,0,0,0}'::float8[],
+--                            '{2,180,200,740,57800,-3400}'::float8[]);
+-- SELECT float8_regr_combine('{3,60,200,750,20000,2000}'::float8[],
+--                            '{2,180,200,740,57800,-3400}'::float8[]);
+-- DROP TABLE regr_test;
+
+
+-- test count, distinct
+SELECT count(udf(four)) AS cnt_1000 FROM onek;
+SELECT udf(count(DISTINCT four)) AS cnt_4 FROM onek;
+
+select ten, udf(count(*)), sum(udf(four)) from onek
+group by ten order by ten;
+
+select ten, count(udf(four)), udf(sum(DISTINCT four)) from onek
+group by ten order by ten;
+
+-- user-defined aggregates
+-- SELECT newavg(four) AS avg_1 FROM onek;
+-- SELECT newsum(four) AS sum_1500 FROM onek;
+-- SELECT newcnt(four) AS cnt_1000 FROM onek;
+-- SELECT newcnt(*) AS cnt_1000 FROM onek;
+-- SELECT oldcnt(*) AS cnt_1000 FROM onek;
+-- SELECT sum2(q1,q2) FROM int8_tbl;
+
+-- test for outer-level aggregates
+
+-- this should work
+select ten, udf(sum(distinct four)) from onek a
+group by ten
+having exists (select 1 from onek b where udf(sum(distinct a.four)) = b.four);
+
+-- this should fail because subquery has an agg of its own in WHERE
+select ten, sum(distinct four) from onek a
+group by ten
+having exists (select 1 from onek b
+               where sum(distinct a.four + b.four) = udf(b.four));
+
+-- [SPARK-27769] Test handling of sublinks within outer-level aggregates.
+-- Per bug report from Daniel Grace.
+select
+  (select udf(max((select i.unique2 from tenk1 i where i.unique1 = o.unique1))))
+from tenk1 o;