David Helgason <david@uti.is> writes:
> EXAMPLE 1:
> maint=# select ('{{1,2,3},{4,5,6}}'::int[])[1][1:3];
> int4
> -----------
> {{1,2,3}}
> (1 row)
> Shouldn't this have been just {1,2,3} ?
Nope. It's equivalent to (...)[1:1][1:3]. See section 8.10.3 "Accessing
Arrays" in the current documentation. Note in particular where it says
An array subscripting operation is always taken to represent an array
slice if any of the subscripts are written in the form lower:upper. A
lower bound of 1 is assumed for any subscript where only one value is
specified, ...
> Shouldn't this have been just {4,5,6} (or maybe {{4,5,6}} accepting the
> result of example 1) ?
See above. You need to write [2:2] not [2].
regards, tom lane