Custom query using LIKE compare method adds weird hash-like strings around search string

[ragingtroll]

below is my test.php file code

<?php
        require_once("wp-load.php");

        $query = "test.query";

        $args = array(
                'part_title' => $query,
                'post_type' => 'product',
                'post_status' => 'publish',
                'posts_per_page' => 5,
                //'orderby' => 'title',
                'orderby' => 'none',
                'order' => 'ASC',
        );

        $args['meta_query']['relation'] = 'AND';
        $args['meta_query'][] = array(
                'key'     => 'wpcf-tecdoc',
                'value'   => 1
        );

        $args['meta_query'][] = array(
                'key'     => 'wpcf-part-number',
                //'value'   => preg_quote($query), /* workaround to get query%, because compare=LIKE gives %query% */
                'value'   => $query,
                'compare' => 'LIKE'
        );

        $wp_query = new WP_Query($args);
        var_dump($wp_query->request);
        die();

outputs something similar to:

LIKE '{632c0741f4b27a83907ceef3c216758d6b81152b5561e7c069c6463b3a041dc7}test.query{632c0741f4b27a83907ceef3c216758d6b81152b5561e7c069c6463b3a041dc7}'

instead of

LIKE 'test.query'

making my query find zero results. If i replace LIKE compare method with RLIKE and use 'test.query', the resulting query works as expected, and finds the right results.

[dd32]

After WordPress 4.8.3 this is expected.

Please see the comments on #42653 and #42409 for adding support for using LIKE against meta_key (You've probably got another filter somewhere on the SQL which is now failing, which wasn't included in the ticket details)