foreign key check makes a big LOCK

Szima Gabor (sygma(at)marr(dot)irisz(dot)hu) reports a bug with a severity of 3
The lower the number the more severe it is.

Short Description
foreign key check makes a big LOCK

Long Description
in: src/backend/utils/adt/ri_triggers.c

RI_FKey_check(), RI_FKey_noaction_upd(), RI_FKey_noaction_del(), etc..
checking the referential with SELECT FOR UPDATE.

After BEGIN TRANSACTION: the INSERT/DELETE/UPDATE calling foreign-key checks, and the SELECT FOR UPDATE locking ALL matched rows in referential table.

I modify ri_triggers.c (remove "FOR UPDATE"). This working.. but is correct?

Sample Code

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