Aleksey Plekhanov created IGNITE-14677:
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Summary: 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
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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