Port Bug Report: transaction control interacts strangely with drop table

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Christopher Oliver
Your email address : oliver(at)traverse(dot)net

Category : runtime: back-end
Severity : serious

Summary: transaction control interacts strangely with drop table

System Configuration
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Operating System : Linux 2.0.33 ELF

PostgreSQL version : 6.5

Compiler used : 2.7.3.2

Hardware:
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Pentium 133 / 64M RAM

Versions of other tools:
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Problem Description:
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Transactions do not protect against outside visibility of
drop table. The interaction leaves an empty file which
held the table which prevents a similarly named table
from being created. Further aborting does not undo
effects of drop table. This does not seem right.

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Test Case:
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Scenario:

1) open two psql sessions (A and B) on the same database.

2) in session 1, create a talbe an populate with entries.

3) in session 2, select * from table to see that values
are present;

4) in session 1, begin a transaction and drop the
newly created table.

5) in session 2, select * from the table. Observe
that the entries are gone though the transaction is
not commited.

6) In session 1, commit the transaction.

7) In session 2, observe select * still shows an
empty table where none should exist.

8) In session 2, observe that while the table doesn't
exist, you may not create another with the same name.
(The file representing the table still exists, and it
is empty.)

Note also that an abort of the transaction will not cause
the data to return.

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Solution:
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