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https://issues.apache.org/jira/browse/SPARK-27768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16848510#comment-16848510
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Dongjoon Hyun commented on SPARK-27768:
---------------------------------------
In addition to [~dkbiswal]'s investigation, I want to add `Presto` result to be
complete. Hive/Spark/Presto is in the same behavior. Personally, I don't think
DB2 and PostgreSQL is currently used in Big Data area.
{code}
presto> select CAST('Infinity' AS DOUBLE);
_col0
----------
Infinity
(1 row)
presto> select CAST('infinity' AS DOUBLE);
Query 20190526_192453_00002_t4z79 failed: Cannot cast 'infinity' to DOUBLE
{code}
> Infinity, -Infinity, NaN should be recognized in a case insensitive manner
> --------------------------------------------------------------------------
>
> Key: SPARK-27768
> URL: https://issues.apache.org/jira/browse/SPARK-27768
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Xiao Li
> Priority: Major
>
> When the inputs contain the constant 'infinity', Spark SQL does not generate
> the expected results.
> {code:java}
> SELECT avg(CAST(x AS DOUBLE)), var_pop(CAST(x AS DOUBLE))
> FROM (VALUES ('1'), (CAST('infinity' AS DOUBLE))) v(x);
> SELECT avg(CAST(x AS DOUBLE)), var_pop(CAST(x AS DOUBLE))
> FROM (VALUES ('infinity'), ('1')) v(x);
> SELECT avg(CAST(x AS DOUBLE)), var_pop(CAST(x AS DOUBLE))
> FROM (VALUES ('infinity'), ('infinity')) v(x);
> SELECT avg(CAST(x AS DOUBLE)), var_pop(CAST(x AS DOUBLE))
> FROM (VALUES ('-infinity'), ('infinity')) v(x);{code}
> The root cause: Spark SQL does not recognize the special constants in a case
> insensitive way. In PostgreSQL, they are recognized in a case insensitive
> way.
> Link: https://www.postgresql.org/docs/9.3/datatype-numeric.html
>
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