get_meta_sql WordPress Filter Hook

The get_meta_sql hook is used to alter the SQL query that is used to retrieve post meta data. This hook can be used to change the way the data is ordered, or to limit the amount of data that is retrieved.

apply_filters_ref_array( 'get_meta_sql', string[] $sql, array $queries, string $type, string $primary_table, string $primary_id_column, object $context ) #

Filters the meta query’s generated SQL.

Parameters
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Parameters

$sql: (string[])Array containing the query's JOIN and WHERE clauses.
$queries: (array)Array of meta queries.
$type: (string)Type of meta. Possible values include but are not limited to 'post', 'comment', 'blog', 'term', and 'user'.
$primary_table: (string)Primary table.
$primary_id_column: (string)Primary column ID.
$context: (object)The main query object that corresponds to the type, for example a WP_Query, WP_User_Query, or WP_Site_Query.