[COMMITTERS] oracompat - oracompat: Add substr() variant

[User Swm]

Log Message:
-----------
Add substr() variant

Modified Files:
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    oracompat:
        string.sql (r1.2 -> r1.3)
        
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/oracompat/oracompat/string.sql.diff?r1=1.2&r2=1.3)

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