How do I have WP_Query match posts based on search parameter OR meta fields? (rather than search parameters AND meta fields)?

Question

I'm trying to include post meta in the scope of a WordPress search using WP_Query.

I have a meta query that looks like this:

$args['meta_query'] = [
    'relation' => 'AND',
    [
         'key' => 'quantity',
         'value' => 1,
         'compare' => '>='
    ],
    [
        'relation' => 'OR'
        [
            'key' => 'brand',
            'value' => 'bar'
        ],
        [
            'key' => 'vendor',
            'value' => 'biz'
        ]
    ]
]

When I add the 's' parameter to the query object, it seems like it's matching posts that have one of the meta query fields "brand" or "vendor", but also matches the description or title.

I want it to match like this: brand OR vendor OR title OR description.

The current semantics seem to be giving me something more like: (brand OR vendor) AND (title OR description)

Answer 1

I had the same desire. A quick and dirty answer is to use the get_meta_sql to replace the leading 'AND' with an 'OR'.

(See also the answer here: https://stackoverflow.com/questions/43734845/how-to-give-or-relation-in-tax-query-and-meta-query-wordpress ( A related, but not duplicate, question.) )