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https://issues.apache.org/jira/browse/ASTERIXDB-2949?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ali Alsuliman updated ASTERIXDB-2949:
-------------------------------------
Priority: Critical (was: Major)
> SUBSTR function may produce malformed string
> --------------------------------------------
>
> Key: ASTERIXDB-2949
> URL: https://issues.apache.org/jira/browse/ASTERIXDB-2949
> Project: Apache AsterixDB
> Issue Type: Bug
> Components: FUN - Functions, RT - Runtime
> Affects Versions: 0.9.3
> Reporter: Ali Alsuliman
> Assignee: Ali Alsuliman
> Priority: Critical
> Fix For: 0.9.8
>
>
> SUBSTR function may produce a malformed string. SUBSTR function uses a string
> builder to construct the output substring. Before constructing the string, it
> gives an estimated length of the output substring to the string builder and
> then starts writing out the substring data to the builder buffer. If the
> actual data written exceeds the estimated length by an amount that requires
> the builder buffer to make more space to encode the actual length and shift
> the substring content, the resulting content gets malformed which might lead
> to failures up in the stack.
> Also, for the function call SUBSTR(input_string, 0, num_chars_to_substring)
> with start offset = 0, SUBSTR always estimates the length to be 0-127 which
> means if the characters written go beyond 127, it will encounter the issue
> described above.
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