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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 |
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821 | * Filters the table alias identified as compatible with the current clause. |
822 | * |
823 | * @since 4.1.0 |
824 | * |
825 | * @param string|bool $alias Table alias, or false if none was found. |
826 | * @param array $clause First-order query clause. |
827 | * @param array $parent_query Parent of $clause. |
828 | * @param WP_Meta_Query $this WP_Meta_Query object. |
829 | */ |
830 | return apply_filters( 'meta_query_find_compatible_table_alias', $alias, $clause, $parent_query, $this ); |
831 | } |
832 |
|
833 | /** |
834 | * Checks whether the current query has any OR relations. |
835 | * |
836 | * In some cases, the presence of an OR relation somewhere in the query will require |
837 | * the use of a `DISTINCT` or `GROUP BY` keyword in the `SELECT` clause. The current |
838 | * method can be used in these cases to determine whether such a clause is necessary. |
839 | * |