Add a config flag tpcds.use-varchar-type in Presto - Java TPC-DS Connector

[pdabre12]

Description

Add a config flag tpcds.use-varchar-type in Presto - Java TPC-DS Connector

Motivation and Context

Resolves: #24362

Impact

Test Plan

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• Please make sure your submission complies with our contributing guide, in particular code style and commit standards.
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• Documented new properties (with its default value), SQL syntax, functions, or other functionality.
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Release Notes

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== RELEASE NOTES ==

TPC-DS Connector Changes
* Add config property ``tpcds.use-varchar-type`` to allow toggling of char columns to varchar columns. :pr:`24406`

[steveburnett]

Thanks for the doc! Unfortunately there's a problem in RST formatting that simple tables - the way the table was initially formatted - "the first column cells cannot contain multiple lines".

See https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html#tables for details.

As a result, adding a second row causes the table to build looking like this:

In a local doc build I recoded the table as a grid table (formatting in the same link above) and a new doc build looked like this:

If it helps, here's a screenshot of the grid table format I used to build the second screenshot in Visual Studio:

If you redo the table in grid table formatting like I did, it should be fine.

[pdabre12]

Thanks @steveburnett for the detailed explanation.
I changed the table to be similar to other connectors.rst files eg: tpch.rst. It renders correctly locally for me.
Please take a look.

[steveburnett]

LGTM! (docs)

Pull updated branch, new local doc build, looks good. Thanks!

[pdabre12]

@aditi-pandit @majetideepak Please take a look, thanks.

[aditi-pandit]

@pdabre12 : Thanks for this code. Have a question about testing... Would it be possible to run these tests https://github.com/prestodb/presto/blob/master/presto-tpcds/src/test/java/com/facebook/presto/tpcds/TestTpcds.java with the flag turned on and off to validate the correctness of this work.