[HIVE-5726] The DecimalTypeInfo instance associated with a decimal constant is not in line with the precision/scale of the constant

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.13.0
• Assignee: Xuefu Zhang
• Reporter: Xuefu Zhang
• Created: 01/Nov/13 16:57
• Updated: 07/Nov/13 15:25
• Resolved: 07/Nov/13 15:25

Description

Currently Hive uses a default decimal type info instance to associate with a decimal constant in the expression tree. To precisely determine the precision/scale of the expression result requires more accurate precision/scale of the type of the decimal constant. Thus, Hive uses a precision/scale of the constant for the type info instance. As an example, the following is not desirable:

hive> create table mytable as select 3.14BD as t from person_age limit 1;
hive> desc mytable;
OK
t                   	decimal(65,30)      	None                
Time taken: 0.08 seconds, Fetched: 1 row(s)

instead, the precision/scale for t above should be (3, 2).

Issue Links

• is required by: HIVE-5356 Move arithmatic UDFs to generic UDF implementations
• links to: https://reviews.apache.org/r/15217/