Re: [BUGS] BUG #14521: pg_attribute.attndims = 0 for array column

Krzysztof Heim <krzysztof.heim@gmail.com> writes:
> If I may ask, what is then the best way of checking if column is array.

The standard way for C code is to use this macro from lsyscache.h:

#define type_is_array(typid)  (get_element_type(typid) != InvalidOid)

or depending on what you're doing, you might want these semantics:

/* type_is_array_domain accepts both plain arrays and domains over arrays */
#define type_is_array_domain(typid)  (get_base_element_type(typid) != InvalidOid)

or then again, you might just want to check if the type has nonzero
typelem --- that would be the appropriate thing if you want to see
whether the type is subscriptable.

            regards, tom lane


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