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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 | 
|---|---|
| 2771 |      /** | 
| 2772 |       * Filters the dbDelta SQL queries for inserting or updating. | 
| 2773 |       * | 
| 2774 |       * Queries filterable via this hook contain "INSERT INTO" or "UPDATE". | 
| 2775 |       * | 
| 2776 |       * @since 3.3.0 | 
| 2777 |       * | 
| 2778 |       * @param string[] $iqueries An array of dbDelta insert or update SQL queries. | 
| 2779 |       */ | 
| 2780 |      $iqueries = apply_filters( 'dbdelta_insert_queries', $iqueries ); | 
| 2781 |  | 
| 2782 |      $text_fields = array( 'tinytext', 'text', 'mediumtext', 'longtext' ); | 
| 2783 |      $blob_fields = array( 'tinyblob', 'blob', 'mediumblob', 'longblob' ); | 
| 2784 |  | 
| 2785 |      $global_tables = $wpdb->tables( 'global' ); | 
| 2786 |      foreach ( $cqueries as $table => $qry ) { | 
| 2787 |           // Upgrade global tables only for the main site. Don't upgrade at all if conditions are not optimal. | 
| 2788 |           if ( in_array( $table, $global_tables, true ) && ! wp_should_upgrade_global_tables() ) { | 
| 2789 |                unset( $cqueries[ $table ], $for_update[ $table ] ); |