pgsql: Improve performance of OverrideSearchPathMatchesCurrent().

Improve performance of OverrideSearchPathMatchesCurrent().

This function was initially coded on the assumption that it would not be
performance-critical, but that turns out to be wrong in workloads that
are heavily dependent on the speed of plpgsql functions. Speed it up by
hard-coding the comparison rules, thereby avoiding palloc/pfree traffic
from creating and immediately freeing an OverrideSearchPath object.
Per report from Scott Marlowe.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/96d66bcfc60d9bcb7db767f23d33abf4d8bc7021

Modified Files
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src/backend/catalog/namespace.c | 50 +++++++++++++++++++++++++++++----------
1 file changed, 37 insertions(+), 13 deletions(-)

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