[jira] [Commented] (CALCITE-3164) Averaging an all-nulls values after grouping produce NaN instead of NULL

[Feng Zhu (JIRA)]

    [ 
https://issues.apache.org/jira/browse/CALCITE-3164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16877529#comment-16877529
 ] 

Feng Zhu commented on CALCITE-3164:
-----------------------------------

Hi, [~mgelbana], I cannot reproduce the issue in current master branch. Could 
you provide more information?
{code:java}
@Test public void testNaNValues() {
  CalciteAssert.that()
      .query("select \"C1\", avg(\"C2\") "
          + "from (values ('X', cast(nullif(1,1) as integer))) as \"T\" 
(\"C1\", \"C2\") "
          + "group by \"C1\"")
      .returns("C1=X; EXPR$1=null\n");
}
{code}

> Averaging an all-nulls values after grouping produce NaN instead of NULL
> ------------------------------------------------------------------------
>
>                 Key: CALCITE-3164
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3164
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.20.0
>            Reporter: Muhammad Gelbana
>            Priority: Major
>
> {code:sql}
> -- Values are a single tuple
> SELECT C1, avg(C2)
> FROM (VALUES('X', NULL::INT)) T (C1, C2)
> GROUP  BY C1
> -- Values are more than a single tuple
> SELECT C1, avg(C2)
> FROM (VALUES('X', NULL::INT), ('X', NULL::INT)) T (C1, C2)
> GROUP  BY C1
> {code}
> Those queries return {{NaN}} while it's expected to return {{NULL}}.



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