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https://issues.apache.org/jira/browse/CALCITE-2273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16457488#comment-16457488
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yuqi commented on CALCITE-2273:
-------------------------------
As far as i see, unicode that have length more than 4 will be converted to two
normal unicode with length of 4
U&'\01CCCC'
will be covert to '\uD833\uDCCC'.
> <Unicode 6 digit escape value> misinterpreted
> ----------------------------------------------
>
> Key: CALCITE-2273
> URL: https://issues.apache.org/jira/browse/CALCITE-2273
> Project: Calcite
> Issue Type: Bug
> Reporter: Zhong Yu
> Assignee: Julian Hyde
> Priority: Major
>
>
>
> The following string literal is accepted by Calcite parser, but the result
> value in Java is incorrect
> {code:java}
> U&'\+01F600'{code}
>
> Cause: currently, SqlLiteral.unescapeUnicode() only intends to handle 4-digit
> unicode escape value in the form of "\xyzw" . When given the 6-digit form
> "\+xyzwrs", it parses the four chars "+xyz" as a hexadecimal, which succeeds
> too. Therefore the result value contains 4 characters: [\u0xyz, w, r, s]
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