Chun Chang created DRILL-1123:
---------------------------------
Summary: how scale (significant digits after decimal point) is
determined for decimal operations
Key: DRILL-1123
URL: https://issues.apache.org/jira/browse/DRILL-1123
Project: Apache Drill
Issue Type: Bug
Components: Functions - Drill
Reporter: Chun Chang
Assignee: Mehant Baid
#Wed Jul 09 10:28:32 PDT 2014
git.commit.id.abbrev=810a204
The way we determine how many significant digits after decimal point during
decimal operation seems confusion, and in some cases, just doesn't make sense.
Here is the experiments I did:
0: jdbc:drill:schema=dfs> select cast('12.3456' as decimal(18,6)) / cast('2.0'
as decimal(38,1)) from data limit 1;
+------------+
| EXPR$0 |
+------------+
| 6.1728000000000000000000000 |
+------------+
1 row selected (0.163 seconds)
0: jdbc:drill:schema=dfs> select cast('12.3456' as decimal(18,6)) / cast('2.0'
as decimal(38,10)) from data limit 1;
+------------+
| EXPR$0 |
+------------+
| 6.1728000000000000 |
+------------+
1 row selected (0.173 seconds)
0: jdbc:drill:schema=dfs> select cast('12.3456' as decimal(18,6)) / cast('2.0'
as decimal(38,20)) from data limit 1;
+------------+
| EXPR$0 |
+------------+
| 6.172800 |
+------------+
1 row selected (0.136 seconds)
0: jdbc:drill:schema=dfs> select cast('12.3456' as decimal(18,6)) / cast('2.0'
as decimal(38,30)) from data limit 1;
+------------+
| EXPR$0 |
+------------+
| 6 |
+------------+
1 row selected (0.185 seconds)
Look at the last example, no decimal digits are displayed, even though I
increased decimal scale.
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