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https://issues.apache.org/jira/browse/CALCITE-6523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17873448#comment-17873448
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suibianwanwan edited comment on CALCITE-6523 at 8/14/24 8:32 AM:
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[~julianhyde] You're right, this comes from Oracle setting empty strings to
null. I will close this issue, more discussion about it can be done at
CALCITE-815
was (Author: JIRAUSER301334):
[~julianhyde] You're right, this comes from Oracle setting empty strings to
null. I will close this issue, discussion on this issue can be done at
[CALCITE-815|https://issues.apache.org/jira/browse/CALCITE-815]
> SUBSTRING via JDBC Adapter on Oracle Returns Unexpected Results
> ---------------------------------------------------------------
>
> Key: CALCITE-6523
> URL: https://issues.apache.org/jira/browse/CALCITE-6523
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: suibianwanwan
> Priority: Minor
>
> I tried to submit the SQL to Calcite as follows, Calcite's JDBC adapter
> converts the query to Oracle SQL, but the Oracle SQL returns results that do
> not match the function's expectations
> {code:java}
> SELECT brand_name a ,substring(brand_name, 15, 1) b sub_brand FROM
> foodmart.product LIMIT 1{code}
> Calcite expected result:
> {code:java}
> a | b
> -------------+--------
> Washington |{code}
> Oracle Return Result:
> {code:java}
> a | b
> -------------+--------
> Washington | NULL{code}
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