Rahul Challapalli created DRILL-1216:
----------------------------------------
Summary: Decimal multiplication breaks when the scale exceeds 38
even when the actual data is small
Key: DRILL-1216
URL: https://issues.apache.org/jira/browse/DRILL-1216
Project: Apache Drill
Issue Type: Bug
Components: Execution - Data Types
Reporter: Rahul Challapalli
git.commit.id.abbrev=caa8b78
Input File Contents :
{code}
111.11|222.22|333.33
444.44|555.55|666.66
777.77|888.88|999.99
{code}
The below SQL query gives inaccurate results since the scale of the
multiplication is 39 (>38):
{code}
select cast(columns[0] as decimal(15,2)) * cast(columns[1] as decimal(15,2)) *
cast(columns[2] as decimal(15,2)) val from `decimal_scale.tbl`;
+------------+
| val |
+------------+
| 1000000000 |
| 0 |
| 0 |
+------------+
{code}
However the below SQL query succeeds :
{code}
select cast(columns[0] as decimal(5,2)) * cast(columns[1] as decimal(5,2)) *
cast(columns[2] as decimal(5,2)) val from `decimal_scale.tbl`;
+------------+
| val |
+------------+
| 8230205.763786 |
| 164604115.275720 |
| 691337284.158024 |
+------------+
{code}
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