fix(testing): Fix orderdate length in testShowColumns

[pramodsatya]

Description

Fixes expected orderdate length in testShowColumns for DWRF file format.

Motivation and Context

Required by tests to be added in #23671 .

== NO RELEASE NOTE ==

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adjust testShowColumns in AbstractTestQueries to correctly determine when orderdate has a max length by checking the actual column type rather than the storage format parameter.

File-Level Changes

Change	Details	Files
Fix orderdate length assertion logic	Replace format.equals("varchar") with orderdateType.equals("varchar") in the default block Replace format.equals("varchar") with orderdateType.equals("varchar") in the varchar(1) block	presto-tests/src/main/java/com/facebook/presto/tests/AbstractTestQueries.java

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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[aditi-pandit]

Thanks @pramodsatya