Обсуждение: pgsql: Eliminate some no-longer-needed workarounds for palloc's old

Log Message:
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Eliminate some no-longer-needed workarounds for palloc's old behavior
of rejecting palloc(0).  Also, tweak like_selectivity() to avoid assuming
the presented pattern is nonempty; although that assumption is valid,
it doesn't really help much, and the new coding is more correct anyway
since it properly handles redundant wildcards.  In combination these
changes should eliminate a Coverity warning noted by Martijn.

Modified Files:
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    pgsql/src/backend/utils/adt:
        selfuncs.c (r1.198 -> r1.199)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/selfuncs.c.diff?r1=1.198&r2=1.199)