Support assignment to subfields of composite columns in UPDATE and INSERT.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 7e64dbc6b5e516a2510ae41c8c7999d1d8d25872
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2004-06-09T19:08:20Z
Releases: 8.0.0
Support assignment to subfields of composite columns in UPDATE and INSERT.
As a side effect, cause subscripts in INSERT targetlists to do something
more or less sensible; previously we evaluated such subscripts and then
effectively ignored them.  Another side effect is that UPDATE-ing an
element or slice of an array value that is NULL now produces a non-null
result, namely an array containing just the assigned-to positions.

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