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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 864 | * Filters the table alias identified as compatible with the current clause. |
| 865 | * |
| 866 | * @since 4.1.0 |
| 867 | * |
| 868 | * @param string|false $alias Table alias, or false if none was found. |
| 869 | * @param array $clause First-order query clause. |
| 870 | * @param array $parent_query Parent of $clause. |
| 871 | * @param WP_Meta_Query $query WP_Meta_Query object. |
| 872 | */ |
| 873 | return apply_filters( 'meta_query_find_compatible_table_alias', $alias, $clause, $parent_query, $this ); |
| 874 | } |
| 875 | |
| 876 | /** |
| 877 | * Checks whether the current query has any OR relations. |
| 878 | * |
| 879 | * In some cases, the presence of an OR relation somewhere in the query will require |
| 880 | * the use of a `DISTINCT` or `GROUP BY` keyword in the `SELECT` clause. The current |
| 881 | * method can be used in these cases to determine whether such a clause is necessary. |
| 882 | * |