Two patches

Hi, everybody!

Attached are two patches for the JDBC sources -

comp_err_patch.txt fixes - a compilation error that I sent a message about earlier (but never got any reply for some reason):
(it fails the same way in both REL7_3_STABLE and HEAD sources)
> Buildfile: ./build.xml
>
> all:
>
> prepare:
> [mkdir] Created dir: /home/dima/postgres7.3/pgsql/src/interfaces/jdbc/build
> [mkdir] Created dir: /home/dima/postgres7.3/pgsql/src/interfaces/jdbc/jars
>
> check_versions:
>
> driver:
> [copy] Copying 1 file to /home/dima/postgres7.3/pgsql/src/interfaces/jdbc/org/postgresql
> [echo] Configured build for the JDBC3 edition driver
>
> compile:
> [javac] Compiling 52 source files to /home/dima/postgres7.3/pgsql/src/interfaces/jdbc/build
> [javac] /home/dima/postgres7.3/pgsql/src/interfaces/jdbc/org/postgresql/jdbc2/AbstractJdbc2ResultSet.java:560: incompatible types
> [javac] found : java.sql.PreparedStatement
> [javac] required: org.postgresql.jdbc2.PreparedStatement
> [javac] deleteStatement = ((java.sql.Connection) connection).prepareStatement(deleteSQL.toString());
> [javac] ^
> [javac] /home/dima/postgres7.3/pgsql/src/interfaces/jdbc/org/postgresql/jdbc2/AbstractJdbc2ResultSet.java:619: incompatible types
> [javac] found : java.sql.PreparedStatement
> [javac] required: org.postgresql.jdbc2.PreparedStatement
> [javac] insertStatement = ((java.sql.Connection) connection).prepareStatement(insertSQL.toString());
> [javac] ^
> [javac] /home/dima/postgres7.3/pgsql/src/interfaces/jdbc/org/postgresql/jdbc2/AbstractJdbc2ResultSet.java:955: incompatible types
> [javac] found : java.sql.PreparedStatement
> [javac] required: org.postgresql.jdbc2.PreparedStatement
> [javac] selectStatement = ((java.sql.Connection) connection).prepareStatement(selectSQL.toString());
> [javac] ^
> [javac] /home/dima/postgres7.3/pgsql/src/interfaces/jdbc/org/postgresql/jdbc2/AbstractJdbc2ResultSet.java:1038: incompatible types
> [javac] found : java.sql.PreparedStatement
> [javac] required: org.postgresql.jdbc2.PreparedStatement
> [javac] updateStatement = ((java.sql.Connection) connection).prepareStatement(updateSQL.toString());
> [javac] ^
> [javac] /home/dima/postgres7.3/pgsql/src/interfaces/jdbc/org/postgresql/jdbc2/Jdbc2Statement.java:11: org.postgresql.jdbc2.Jdbc2Statement should be declared abstract; it does not define getMoreResults(int) in org.postgresql.jdbc2.Jdbc2Statement
> [javac] public class Jdbc2Statement extends org.postgresql.jdbc2.AbstractJdbc2Statement implements java.sql.Statement
>

The other one - timestamp_perf_patch.txt
Fixes some performance problem I ran into, that has to do with parsing Timestamps - I was running a query that returned lots
(like, a few thousand) rows, and it was taking much longer than I would expect. After some debugging and profiling, I was surprised
to find out, that *literally* most of the time was spent inside "new SimpleDateFormat()"...

So, I made those formats to only be created ones, and stored in a static field. That made that unfortunate query about 80% quicker.
I was also able to see some accross the board performance improvements (although, not that dramatic, because normally my queries would
only return a handful of rows, so the time wasted on creating those formats would be less noticable).
So, I am sending it your way in case you like what it does, and want to put it in...
Let me know if you see any problems with it.

Thanks!

Dima