Shuo Cheng created FLINK-22586:
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Summary: Improve precision derivation for decimal arithmetics
Key: FLINK-22586
URL: https://issues.apache.org/jira/browse/FLINK-22586
Project: Flink
Issue Type: Improvement
Components: Table SQL / Runtime
Affects Versions: 1.13.0
Reporter: Shuo Cheng
Fix For: 1.14.0
Currently the precision and scale derivation is not properly for decimal data
arithmetics, e.g,
considering the following example:
{code:java}
select cast('10.1' as decimal(38, 19)) * cast('10.2' as decimal(38, 19)) from
T{code}
the result is `null`, which may confuses use a lot, because the result is far
from overflow actually.
The root cause is the precision derivation for the above multiplication is:
(38, 19) * (38, 19) -> (38, 38)
So there is no space for integral digits, which leads to null results.
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