tree 5d1524083e4c601789e5a97ea239ee87442b672c
parent 02ea049d7a5e2432959277b09576e6ff5f81a13a
author Ali Alsuliman <ali.al.solaiman@gmail.com> 1629212411 +0300
committer Ali Alsuliman <ali.al.solaiman@gmail.com> 1631046406 +0000

[ASTERIXDB-2949][RUN][FUN] SUBSTR function produces malformed string

- user model changes: no
- storage format changes: no
- interface changes: no

Details:
- Fix UTF8StringBuilder grow logic

UTF8StringBuilder initially takes an estimated length of the
string to be written and reserves space at the beginning
of the buffer to later store the length of the data written.
When the actual data written happens to be greater than the
estimated length requiring more space to store the length,
the string content needs to be shifted.

This patch is to fix the starting offset of the data to be shifted.
Also, the estimated length calculation of the substring method of
the UTF8StringPointable is modified to account for
SUBSTR(input_string, 0, num_chars_to_substring) with start offset = 0.

Change-Id: If36253ff884a9c19eaa130c4e5e926f2dd9eea1d
Reviewed-on: https://asterix-gerrit.ics.uci.edu/c/asterixdb/+/12864
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Ali Alsuliman <ali.al.solaiman@gmail.com>
Reviewed-by: Ian Maxon <imaxon@uci.edu>