List of error messages from PL/Proxy. Specified is only first part of message.
There can be additional info appended (error location etc)

Generic error message format:
ERROR: ({file}:{line}) {errno}:{error_str} {message text}

In following, only {errno}:{error_str} is described

1:GENERIC
    This is returned by last resort error handler when there is no specific
    handler

2:SPI
    There is nothing PL/Proxy can do. It is best to reconnect to set PL/Proxy
    back to known state.

3:NULL_HASH
    Hash function returned null value

4:NO_MEM
    Can't allocate more memory

5:NOT_IMPL
    Some requested feature is not implemented yet

6:NO_TRIGGER
    PL/Proxy function can't be called as trigger

7:SET_CONTEXT
    Set-valued function called in context that cannot accept a set.

8:SYS_CACHE
    System's cache lookup failed for oid

9:ANY
    PL/Proxy does not support polymorphic procedures with anyelement/anyarray
    as parameter(s)

10:TYPE
    Specified type not supported.

11:SRC_NULL
    PL/Proxy procedure source is null

12:SYNTAX
    PL/Proxy procedure syntax error with source line

13:POOL_CONNECT
    Error during connecting to connection pooler

14:POOL_CONFIG
    Error reading partitions configuration from database

1001:POOL
    SQL error from partition

1002:EPOOL
    Requested feature is not implemented yet

1003:EPOOL
    Connection to requested partition is broken.

1004:EPOOL
    Connection to requested partition is not found.

1005:EPOOL
    Requested cluster not found

1006:EPOOL
    Requested partition not found
