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https://issues.apache.org/jira/browse/CALCITE-1517?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Dongming Liu updated CALCITE-1517:
----------------------------------
Description:
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?
was:
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?
> 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 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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