Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/999#discussion_r13518251
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercion.scala
---
@@ -108,6 +108,9 @@ trait HiveTypeCoercion {
*
* Additionally, all types when UNION-ed with strings will be promoted
to strings.
* Other string conversions are handled by PromoteStrings.
+ *
+ * A widening conversion of a value with IntegerType and LongType to
FloatType,
--- End diff --
Maybe more clear if you document it this way:
```
Widening types might result in loss of precision the following cases:
- IntegerType to FloatType
- LongType to FloatType
- LongType to DoubleType
```
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