[
https://issues.apache.org/jira/browse/SPARK-9264?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Yin Huai updated SPARK-9264:
----------------------------
Description:
The problem is
https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercion.scala#L361-L362.
When we union/intersect/except, for a column, if the data type of it in one
table is a fixed precision decimal type and that in another table is a
FloatType/DoubleType, we cast FloatType to Decimal(7, 7) and cast DoubleType to
Decimal(15, 15), respectively. It is wrong.
I tried the following in 1.4
{code}
sqlContext.sql("select a from (select cast(200.101 as double) as a union all
select cast(200.101 as decimal(6,3)) as a) tmp").show
{code}
I got
{code}
+-------------------+
| a|
+-------------------+
| null|
|200.101000000000000|
+-------------------+
{code}
was:The problem is
https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercion.scala#L361-L362.
When we union/intersect/except, for a column, if the data type of it in one
table is a fixed precision decimal type and that in another table is a
FloatType/DoubleType, we cast FloatType to Decimal(7, 7) and cast DoubleType to
Decimal(15, 15), respectively. It is wrong.
> When dealing with Union/Intersect/Except, we cast FloatType/DoubleType to the
> wrong DecimalType
> -----------------------------------------------------------------------------------------------
>
> Key: SPARK-9264
> URL: https://issues.apache.org/jira/browse/SPARK-9264
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 1.4.0
> Reporter: Yin Huai
> Priority: Blocker
>
> The problem is
> https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercion.scala#L361-L362.
> When we union/intersect/except, for a column, if the data type of it in one
> table is a fixed precision decimal type and that in another table is a
> FloatType/DoubleType, we cast FloatType to Decimal(7, 7) and cast DoubleType
> to Decimal(15, 15), respectively. It is wrong.
> I tried the following in 1.4
> {code}
> sqlContext.sql("select a from (select cast(200.101 as double) as a union all
> select cast(200.101 as decimal(6,3)) as a) tmp").show
> {code}
> I got
> {code}
> +-------------------+
> | a|
> +-------------------+
> | null|
> |200.101000000000000|
> +-------------------+
> {code}
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