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pgsql: Fix string_to_array() to correctly handle the case where there - Mailing list pgsql-committers

From [email protected] (Tom Lane)
Subject pgsql: Fix string_to_array() to correctly handle the case where there
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Msg-id [email protected]
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Log Message:
-----------
Fix string_to_array() to correctly handle the case where there are
overlapping possible matches for the separator string, such as
string_to_array('123xx456xxx789', 'xx').
Also, revise the logic of replace(), split_part(), and string_to_array()
to avoid O(N^2) work from redundant searches and conversions to pg_wchar
format when there are N matches to the separator string.
Backpatched the full patch as far as 8.0.  7.4 also has the bug, but the
code has diverged a lot, so I just went for a quick-and-dirty fix of the
bug itself in that branch.

Tags:
----
REL8_0_STABLE

Modified Files:
--------------
    pgsql/src/backend/utils/adt:
        varlena.c (r1.118.4.2 -> r1.118.4.3)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/varlena.c.diff?r1=1.118.4.2&r2=1.118.4.3)

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