Support for parsing timestamp with/without time zone[] and time with/without time zone[] with postgres

[cpcloud]

Is your feature request related to a problem? Please describe.

Not related to a problem.

Describe the solution you'd like

I'd like sqlglot to support parsing the timestamp without time zone[] and time without time zone[] types for the postgres dialect.

Describe alternatives you've considered

I haven't considered any alternatives

Additional context

Proof that this is a thing :)

ibis_testing> create table t (x timestamp without time zone []);
CREATE TABLE
Time: 0.009s

[tobymao]

can you share the docs for this @cpcloud

[tobymao]

select cast('2022-01-01' as timestamp without time zone []) this is a syntax error

[cpcloud]

ibis_testing> select cast(array['2022-01-01'] as timestamp without time zone[]);
+-------------------------+
| array                   |
|-------------------------|
| ['2022-01-01 00:00:00'] |
+-------------------------+

You need to wrap it in the array constructor :)

[cpcloud]

The arrays docs say

PostgreSQL allows columns of a table to be defined as variable-length multidimensional arrays. Arrays of any built-in or user-defined base type, enum type, composite type, range type, or domain can be created.

Since timestamp without time zone is a built in type, it would follow that timestamp without time zone[] is a valid array type.

After the first example there's:

As shown, an array data type is named by appending square brackets ([]) to the data type name of the array elements.