[PATCH] OGR SQL 'SUBSTR' is not conformant with other SQL implementations

[rouault]

Our implementation considers that the character offset is like C language, that is to say that the first character is offset 0, the second one is offset 1, etc... All other implementations I've found consider 1 as the first character, 2 as the second one (and as a special case, if 0 is provided, they turn it to 1...)

References:

•  http://www.sqlite.org/lang_corefunc.html (SQLite)
•  http://www.1keydata.com/sql/sql-substring.html (several implementations)
•  http://www.adp-gmbh.ch/ora/sql/substr.html (Oracle)
•  http://www.postgresql.org/docs/8.1/static/functions-string.html (PostgreSQL)
•  http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_substr (mysql)

Should we fix our implementation ? (SUBSTR has been introduced in GDAL 1.8.0 and is not yet advertized in ogr_sql.dox)

[rouault]

r23434 /trunk/ (3 files in 2 dirs): [backward-compatibility] OGR SQL: fix offset convertion for SUBSTR() (#4348)

r23435 /branches/1.8/ (3 files in 2 dirs): [backward-compatibility] OGR SQL: fix offset convertion for SUBSTR() (#4348)

[rouault]

Milestone 1.8.2 deleted