Vihang Karajgaonkar created HIVE-14085:
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Summary: Allow type widening primitive conversion on hive/parquet
tables
Key: HIVE-14085
URL: https://issues.apache.org/jira/browse/HIVE-14085
Project: Hive
Issue Type: Improvement
Components: File Formats
Affects Versions: 2.1.0
Reporter: Vihang Karajgaonkar
Assignee: Vihang Karajgaonkar
There is a JIRA ticket on upstream that brought this usability improvement in
Hive to support auto type widening for Parquet tables. See
https://issues.apache.org/jira/browse/HIVE-12080
This improvement is very useful for users who have schema evolution on their
tables. For example, a Hive table with a "bigint" can read parquet files with
"int32" and "int64" types.
The patch only supports widening conversions from int->bigint and
float->double. We should support more types to allow users read their changed
parquet schema.
Here's a list of widening conversions we should support:
{code}
tinyint -> smallint,int,bigint,float,double
smallint -> int,bigint,float,double
int -> bigint,float,double
bigint -> float,double
float -> double
double -> --
{code}
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