pgsql: Use a bitmapset instead of a list for duplicate-column checking

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pgsql: Use a bitmapset instead of a list for duplicate-column checking

От:
tgl@svr1.postgresql.org (Tom Lane)
Дата:
Log Message:
-----------
Use a bitmapset instead of a list for duplicate-column checking in
checkInsertTargets().  Avoids O(N^2) behavior on wide target lists.

Modified Files:
--------------
    pgsql/src/backend/parser:
        parse_target.c (r1.129 -> r1.130)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_target.c.diff?r1=1.129&r2=1.130)
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