Jihun Kang created TAJO-1019:
--------------------------------
Summary: Rounding Errors in Floating Point Arithmetic
Key: TAJO-1019
URL: https://issues.apache.org/jira/browse/TAJO-1019
Project: Tajo
Issue Type: Improvement
Environment: Ubuntu 14.04
Hadoop 2.4.1
Reporter: Jihun Kang
Priority: Minor
Floating point rounding errors are found when executing some statement on cli.
When running math functions with this floating point number, results will be
varied based on which JVM "Math" implementation used.
default> select 0.8-0.1;
?minus
-------------------------------
0.7000000000000001
(1 rows, 0.067 sec, 0 B selected)
With a modified Float8Dotum class, SQL result will be shown like this.
default> select 0.8-0.1;
?minus
-------------------------------
0.7
(1 rows, 0.004 sec, 0 B selected)
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