[SQL] How do I quit in the middle of a SQL script?

[Wei Weng]

Say if I want to add a small snip of code in front of the sql script 
generated by the pg_dump, to check for something then if the condition 
doesn't match, the script terminates right away. (Without actually doing the 
restoring stuff that the following large chunk is supposed to do)

Can I do that? And is it a good idea to add arbitrary code to the database 
dump sql script?

Thanks!
Wei
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TIP 9: the planner will ignore your desire to choose an index scan if your
     joining column's datatypes do not match