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https://issues.apache.org/jira/browse/IMPALA-11127?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Quanlong Huang resolved IMPALA-11127.
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Fix Version/s: Impala 4.1.0
Resolution: Fixed
> Document the UTF8_MODE query option and relavent string functions
> -----------------------------------------------------------------
>
> Key: IMPALA-11127
> URL: https://issues.apache.org/jira/browse/IMPALA-11127
> Project: IMPALA
> Issue Type: Documentation
> Affects Versions: Impala 4.1.0
> Reporter: Quanlong Huang
> Assignee: shajini thayasingh
> Priority: Major
> Fix For: Impala 4.1.0
>
>
> Since IMPALA-2019 is resolved, we can document the UTF8_MODE query option
> added in it now. The query option will turn on the UTF-8 aware behavior of
> string functions. The relevant string functions and their UTF-8 aware
> behaviors are:
> * LENGTH(STRING a)
> ** returns the number of UTF-8 characters instead of bytes
> * SUBSTR(STRING a, INT start [, INT len])
> SUBSTRING(STRING a, INT start [, INT len])()
> ** the substring start position and length is counted by UTF-8 characters
> instead of bytes
> * REVERSE(STRING a)
> ** the unit of the operation is a UTF-8 character, ie. it won't reverse
> bytes inside a UTF-8 character.
> * INSTR(STRING str, STRING substr[, BIGINT position[, BIGINT occurrence]])
> LOCATE(STRING substr, STRING str[, INT pos])
> ** These functions have an optional position argument. The return values are
> also positions in the string. In UTF-8 mode, these positions are counted by
> UTF-8 characters instead of bytes.
> * mask functions
> ** The unit of the operation is a UTF-8 character, ie. they won't mask the
> string byte-to-byte.
> * upper/lower/initcap
> ** These functions will recognize non-ascii characters and transform them
> based on the current locale used by the Impala process.
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