Dilly King created SPARK-30212:
----------------------------------
Summary: Could not use COUNT(DISTINCT) window function in SparkSQL
Key: SPARK-30212
URL: https://issues.apache.org/jira/browse/SPARK-30212
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.4.4
Environment: Spark 2.4.4
Scala 2.11.12
Hive 2.3.6
Reporter: Dilly King
Suppose we have a typical table in Hive like below:
{code:sql}
CREATE TABLE DEMO_COUNT_DISTINCT (
demo_date string,
demo_id string
);
{code}
{noformat}
+--------------------------------+------------------------------+
| demo_count_distinct.demo_date | demo_count_distinct.demo_id |
+--------------------------------+------------------------------+
| 20180301 | 101 |
| 20180301 | 102 |
| 20180301 | 103 |
| 20180401 | 201 |
| 20180401 | 202 |
+--------------------------------+------------------------------+
{noformat}
Now I want to count distinct number of DEMO_DATE but also reserve every
columns' data in each row.
So I use COUNT(DISTINCT) window function like below in Hive beeline and it work:
{code:sql}
SELECT T.*, COUNT(DISTINCT T.DEMO_DATE) OVER(PARTITION BY NULL) UNIQ_DATES
FROM DEMO_COUNT_DISTINCT T;
{code}
{noformat}
+--------------+------------+-------------+
| t.demo_date | t.demo_id | uniq_dates |
+--------------+------------+-------------+
| 20180401 | 202 | 2 |
| 20180401 | 201 | 2 |
| 20180301 | 103 | 2 |
| 20180301 | 102 | 2 |
| 20180301 | 101 | 2 |
+--------------+------------+-------------+
{noformat}
But when I came to SparkSQL, it threw exception even if I run the same SQL.
{code:sql}
spark.sql("""
SELECT T.*, COUNT(DISTINCT T.DEMO_DATE) OVER(PARTITION BY NULL) UNIQ_DATES
FROM DEMO_COUNT_DISTINCT T
""").show
{code}
{noformat}
org.apache.spark.sql.AnalysisException: Distinct window functions are not
supported: count(distinct DEMO_DATE#1) windowspecdefinition(null,
specifiedwindowframe(RowFrame, unboundedpreceding$(), unboundedfollowing$()));;
Project [demo_date#1, demo_id#2, UNIQ_DATES#0L]
+- Project [demo_date#1, demo_id#2, UNIQ_DATES#0L, UNIQ_DATES#0L]
+- Window [count(distinct DEMO_DATE#1) windowspecdefinition(null,
specifiedwindowframe(RowFrame, unboundedpreceding$(), unboundedfollowing$()))
AS UNIQ_DATES#0L], [null]
+- Project [demo_date#1, demo_id#2]
+- SubqueryAlias `T`
+- SubqueryAlias `default`.`demo_count_distinct`
+- HiveTableRelation `default`.`demo_count_distinct`,
org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, [demo_date#1, demo_id#2]
{noformat}
Then I try to use countDistinct function but also got exceptions.
{code:sql}
spark.sql("""
SELECT T.*, countDistinct(T.DEMO_DATE) OVER(PARTITION BY NULL) UNIQ_DATES
FROM DEMO_COUNT_DISTINCT T
""").show
{code}
{noformat}
org.apache.spark.sql.AnalysisException: Undefined function: 'countDistinct'.
This function is neither a registered temporary function nor a permanent
function registered in the database 'default'.; line 2 pos 12
at
org.apache.spark.sql.catalyst.analysis.Analyzer$LookupFunctions$$anonfun$apply$15$$anonfun$applyOrElse$49.apply(Analyzer.scala:1279)
at
org.apache.spark.sql.catalyst.analysis.Analyzer$LookupFunctions$$anonfun$apply$15$$anonfun$applyOrElse$49.apply(Analyzer.scala:1279)
at
org.apache.spark.sql.catalyst.analysis.package$.withPosition(package.scala:53)
......
{noformat}
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