[jira] [Updated] (IGNITE-14677) Calcite engine. Add 32-bit Unicode characters support

["Yury Gerzhedovich (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-14677?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yury Gerzhedovich updated IGNITE-14677:
---------------------------------------
    Labels: calcite2-required calcite3-required  (was: )

> Calcite engine. Add 32-bit Unicode characters support
> -----------------------------------------------------
>
>                 Key: IGNITE-14677
>                 URL: https://issues.apache.org/jira/browse/IGNITE-14677
>             Project: Ignite
>          Issue Type: Improvement
>            Reporter: Aleksey Plekhanov
>            Priority: Minor
>              Labels: calcite2-required, calcite3-required
>
> Currently, all SQL string length-dependent functions ({{length}}, {{substr}}, {{right}}, {{left}}, {{lpad}}, {{rpad}}, etc) work correctly only with up to 16-bit Unicode characters. These functions mapped to java {{String}} class functions (length, substring, etc), which operates with an array of 16-bit {{char}}'s. For example, the result of {{"🦆".length()}} will be 2, and the result of {{SELECT CHAR_LENGTH('🦆}}') will be 2. 
> Java {{String}} class has method {{offsetByCodePoints}} which can be used to implement functions that correctly work with 32-bit characters, but there will be a performance drop if this method will be used for all strings. Perhaps we need dedicated functions with 32-bit characters support.



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