BUG #3106: A problem with escaping table name pattern for DatabaseMetaData.getColumns()

The following bug has been logged online:

Bug reference: 3106
Logged by: Valery Meshkov
Email address: meshok2001-news(at)yahoo(dot)com
PostgreSQL version: 8.2.3
Operating system: Windows
Description: A problem with escaping table name pattern for
DatabaseMetaData.getColumns()
Details:

I am seeing a problem in the JDBC driver postgresql-8.2-504.jdbc3.jar with
getting columns of the table 'A_B'. I am escaping '_' with the escape
value returned by DatabaseMetaData.getSearchStringEscape(), which in my case
is "\\\\" (standard_conforming_strings is off). When I pass the resulting
table name 'A\\_B' to DatabaseMetaData.getColumns() the number of
backslashes doubles again, resulting in 4 backslashes in the select
statement:

SELECT n.nspname,c.relname,a.attname,a.atttypid,a.attnotnull,a.atttypmod,
a.attlen,a.attnum,def.adsrc,dsc.description
FROM pg_catalog.pg_namespace n JOIN pg_catalog.pg_class c ON
(c.relnamespace = n.oid)
JOIN pg_catalog.pg_attribute a ON (a.attrelid=c.oid)
LEFT JOIN pg_catalog.pg_attrdef def ON (a.attrelid=def.adrelid AND a.attnum
= def.adnum)
LEFT JOIN pg_catalog.pg_description dsc ON (c.oid=dsc.objoid AND a.attnum =
dsc.objsubid)
LEFT JOIN pg_catalog.pg_class dc ON (dc.oid=dsc.classoid AND
dc.relname='pg_class')
LEFT JOIN pg_catalog.pg_namespace dn ON (dc.relnamespace=dn.oid AND
dn.nspname='pg_catalog') WHERE a.attnum > 0 AND NOT a.attisdropped AND
c.relname LIKE 'A\\\\_B' ORDER BY nspname,relname,attnum

With this select no columns are found. If I change the escape string in the
debugger to have just one backslash ("\\") everything works fine. It is
also working with the 8.1-404 driver.