The following bug has been logged on the website:
Bug reference: 15084
Logged by: Tudor Bosman
Email address: tudorb@gmail.com
PostgreSQL version: 9.5.11
Operating system: Ubuntu 16.04
Description:
PostgreSQL will not always detect an invalid LIKE pattern (one that ends
with a backslash).
Example:
tudor=# select 'foo' like 'foo\';
?column?
----------
f
(1 row)
tudor=# select 'foobar' like 'foo\';
ERROR: LIKE pattern must not end with escape character
This probably happens because the pattern is only parsed lazily (as needed);
if PostgreSQL detects that a match is impossible, it doesn't even look at
the rest of the pattern.
Still, it would be nice for error reporting to be consistent.
Thanks,
-Tudor.