Bug #620: create index ... (date_part('year', d)) fails

Ernst Molitor (molitor(at)uni-bonn(dot)de) reports a bug with a severity of 3
The lower the number the more severe it is.

Short Description
create index ... (date_part('year', d)) fails

Long Description
IMHO, creation of an index on a part of a date field should work,
but it fails due to the definition of "create index ..." in gram.y.

Maybe I'm wrong, but I feel that for large tables which will have to be analyzed per year, an index of this kind could be an advantage.

Sample Code
-- the table
create table test (d date);

-- partial indices:
create index d_year on test (date_part('year', d));

-- fails with: ERROR: parser: parse error at or near "'"

create index d_year on test (extract(year from d));

-- fails with: ERROR: parser: parse error at or near "("

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