I started working again on my
My question is $SUBJECT.
This code is in rewriteTargetlist():

new_attr = build_column_default()
new_tle = makeTargetEntry((Expr *) new_expr, ...)

Now, in ExecInsert() I have to compute
the default for IDENTITY/GENERATED
between ExecConstraints() and heap_insert().

How can I create a Datum out of either an Expr
or a TargetEntry (that contains the computed
constant out of the default expression) so I can
use it after I did an heap_deform_tuple()?

Best regards,
Zoltán Böszörményi

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TIP 9: In versions below 8.0, the planner will ignore your desire to
      choose an index scan if your joining column's datatypes do not

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