Filtering orders list in WooCommerce with HPOS

I'm in the process of converting an open source plugin to be HPOS-compatible. One of its features is additional filters on the orders list in admin (inline with the order statuses), eg:

I can't seem to actually execute the modification of the query. Previously, I was hooking into pre_get_posts which obviously is no longer relevant when WP_Post is no longer being used.

Then the same for a filter field, for which I was hooking into restrict_manage_posts. found the equivalent hook: woocommerce_order_list_table_restrict_manage_orders

Anyone have an idea which hook to use?

As WC_Order_Query is used to query orders for HPOS, the following filters should still work:

• woocommerce_order_query_args filter hook (replaces pre_get_posts),
• woocommerce_order_query filter hook (replaces pre_get_posts),
• and may be try woocommerce_order_data_store_cpt_get_orders_query filter hook.

For restrict_manage_posts hook now you will use:
woocommerce_order_list_table_restrict_manage_orders

Some others replacements hooks with HPOS:

• To edit existing columns or add custom columns to admin Orders list:

  • manage_woocommerce_page_wc-orders_columns replaces the hook
    manage_edit-shop_order_columns,
  • manage_woocommerce_page_wc-orders_custom_column replaces the hook
    manage_shop_order_posts_custom_column.

• To make custom columns sortable in admin Order list use:

  • woocommerce_shop_order_list_table_sortable_columns replacing the hook
    manage_edit-shop_order_sortable_columns

• To make custom order metadata searchable in admin Order list use:

  • woocommerce_order_table_search_query_meta_keys replacing the hook
    woocommerce_shop_order_search_fields.

• To edit the filters and navigation in admin Orders list:

  • woocommerce_order_list_table_extra_tablenav replaces the hook manage_posts_extra_tablenav.

• For Bulk actions in admin Orders list:

  • bulk_actions-woocommerce_page_wc-orders replaces the hook
    bulk_actions-edit-shop_order
  • handle_bulk_actions-woocommerce_page_wc-orders has 2 arguments $column and $order and replaces the hook handle_bulk_actions-edit-shop_order

On High-Performance Order Storage documentation, there is a link to High Performance Order Storage Upgrade Recipe Book where you will find the path(s) to related core files you are looking for.

In this documentation, you have:

use Automattic\WooCommerce\Internal\DataStores\Orders\CustomOrdersTableController;

that points to woocommerce/src/Internal/DataStores/Orders, where OrdersTableQuery.php file is the right location to look at.

Inside the method maybe_override_query() you have at line 233:

$pre_query = apply_filters( 'woocommerce_hpos_pre_query', null, $this, $this->sql );

Inside the method build_query() you have at line 877:

$clauses = (array) apply_filters_ref_array( 'woocommerce_orders_table_query_clauses', array( $pieces, &$this, $this->args ) );

And so on…