[jira] [Updated] (CALCITE-1517) Calcite use ReduceExpressionsRule make '' to ' '

["Julian Hyde (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-1517?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julian Hyde updated CALCITE-1517:
---------------------------------
    Fix Version/s: 1.11.0

> 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
>             Fix For: 1.11.0
>
>
> SQL
> {code}
> select * from ta 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?



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