Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/20023#discussion_r158155039
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala
---
@@ -1526,15 +1526,15 @@ class SQLQuerySuite extends QueryTest with
SharedSQLContext {
checkAnswer(sql("select 10.300000000000000000 * 3.000000000000000000"),
Row(BigDecimal("30.900000000000000000000000000000000000", new
MathContext(38))))
checkAnswer(sql("select 10.300000000000000000 *
3.0000000000000000000"),
- Row(null))
--- End diff --
Two cases (2 and 3) were mentioned in the email. If this is the only
`NULL`-return test case from previous behavior, can we have another test case?
```
Currently, Spark behaves like follows:
1. It follows some rules taken from intial Hive implementation;
2. it returns NULL;
3. it returns NULL.
```
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