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https://issues.apache.org/jira/browse/CALCITE-7088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18003588#comment-18003588
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Julian Hyde commented on CALCITE-7088:
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[~xuzifu666],
Can you answer my question:
{quote}
In your PR you add a test that “%%A” should not be simplified to “%A”. I would
like to hear from you a principled justification for why we should stop at “%%”.
{quote}
> X LIKE '%%'(with any number of '%') should simply to X=X
> --------------------------------------------------------
>
> Key: CALCITE-7088
> URL: https://issues.apache.org/jira/browse/CALCITE-7088
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.40.0
> Reporter: Yu Xu
> Assignee: Yu Xu
> Priority: Minor
> Fix For: 1.41.0
>
>
> sql:
> {code:java}
> "select \"net_weight\" like '%' from \"product\""{code}
> would convert as expected:
> {code:java}
> "SELECT NULL OR \"net_weight\" IS NOT NULL\nFROM
> \"foodmart\".\"product\""{code}
> but sql：
> {code:java}
> "select \"net_weight\" like '%%' from \"product\""{code}
> would convert not as expected:
> {code:java}
> "SELECT \"net_weight\" LIKE '%%'\nFROM \"foodmart\".\"product\"" ;{code}
>
> *note: "x = x" simplifies to "null or x is not null"*
>
> LIKE '%%' (with any number of '%') should keep the same with LIKE '%'
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