You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@calcite.apache.org by "Dongming Liu (JIRA)" <ji...@apache.org> on 2016/11/30 10:06:58 UTC
[jira] [Created] (CALCITE-1517) Calcite use ReduceExpressionsRule
make '' to ' '
Dongming Liu created CALCITE-1517:
-------------------------------------
Summary: Calcite use ReduceExpressionsRule make '' to ' '
Key: CALCITE-1517
URL: https://issues.apache.org/jira/browse/CALCITE-1517
Project: Calcite
Issue Type: Bug
Affects Versions: 1.11.0
Reporter: Dongming Liu
Assignee: Julian Hyde
SQL
{code}
select * from t1 where ta.a <> '';
{code}
If the type of {{ta.a}} is {{CHAR(1)}}, when I call {{SqlToRelConverter}}, will add a CAST function to cast the empty string to CHAR(1), like this:
{code}
CAST(''):CHAR(1) CHARACTER SET "ISO-8859-1" COLLATE "ISO-8859-1$en_US$primary" NOT NULL
{code}
But, when I use the {{ReduceExpressionsRule}} rule in planner, it will remove the cast and convert the empty string '' to ' '(string with a space)。Obviously, '' is not equal to ' '。
Is this a bug?
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)