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

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Details

Type: Improvement
Status: Resolved
Priority: Major
Resolution: Fixed
Affects Version/s: None
Fix Version/s: 0.13.0
Component/s: None
Labels:
None

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).