Minor nitpicks:

Let me suggest to use get_attnum() in CreateStatistics instead of
SearchSysCacheAttName for each column.  Also, we use type AttrNumber for
attribute numbers rather than int16.  Finally in the same function you
have an erroneous ERRCODE_UNDEFINED_COLUMN which should be
ERRCODE_DUPLICATE_COLUMN in the loop that searches for duplicates.

May I suggest that compare_int16 be named attnum_cmp (just to be
consistent with other qsort comparators) and look like
        return *((const AttrNumber *) a) - *((const AttrNumber *) b);
instead of memcmp?

Álvaro Herrera                https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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