Improve support of UPDATE with FROM in PostgreSQL compatibility mode #3544
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Closes #3543.
Support for this PostgreSQL-specific command was removed from the
Updateclass. AMergeUsinginstance is created instead of it directly by the parser whenUPDATEhas theFROMclause.There is no intention to add a complete support. This implementation is better than old one, but it is still incomplete. It supports only one
<table reference>in theFROMclause, but PostgreSQL allows multiple comma-separated table references like in theSELECTcommand.