implicit declaration of datumIsEqual in parse_coerce.c

Hi,

Not sure what changed, but I'm seeing this failure:

parse_coerce.c: In function ‘coerce_type’:
parse_coerce.c:345:9: warning: implicit declaration of function ‘datumIsEqual’ [-Wimplicit-function-declaration]
345 | if (!datumIsEqual(newcon->constvalue, val2, false, newcon->constlen))
| ^~~~~~~~~~~~

Not sure if this because of compiler version (I'm on gcc 9.2.1) or
something else - I don't see any obvious changes to relevant parts of
the code, but I haven't dug too much.

Simply including 'utils/datum.h' resolves the issue.

regards

--
Tomas Vondra http://www.2ndQuadrant.com
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