Remove cayenne catalog

website/docs/reference/sql/dml.md

@@ -81,59 +81,3 @@ SELECT order_id, customer_id, total, order_date
 FROM orders
 WHERE order_date < '2024-01-01';
 ```
-
-## MERGE INTO
-
-Update rows in a target table based on matching rows from a source table. Currently supported for [Spice Cayenne](../../components/data-accelerators/cayenne) catalog tables only.
-
-### Syntax
-
-```sql
-MERGE INTO target [AS alias]
-USING source [AS alias]
-ON <join_condition>
-WHEN MATCHED THEN UPDATE SET column1 = expr1 [, column2 = expr2, ...]
-```
-
-### Parameters
-
-- **`target`**: The table to update. Must be a Cayenne catalog table.
-- **`source`**: The table containing new values. Must be a Cayenne catalog table.
-- **`join_condition`**: A conjunction of equality predicates (e.g., `target.id = source.id AND target.region = source.region`).
-- **`column = expr`**: Column assignments applied to matched rows. Expressions can reference columns from both target and source tables using aliases.
-
-### Constraints
-
-- Only `WHEN MATCHED THEN UPDATE SET` is supported (no `INSERT`, `DELETE`, or `NOT MATCHED` clauses).
-- The `ON` clause must use equality predicates only, joined with `AND`.
-- The target table must not have `primary_key` or `on_conflict` configured.
-- The source table must not contain duplicate rows for the same join key(s). If duplicates are detected, the MERGE operation fails with an error to prevent data loss. Deduplicate the source table before running MERGE.
-- In distributed deployments, both source and target tables must be partitioned by the same column, and the partition column must appear in the `ON` clause join keys. Use [`CREATE TABLE ... LIKE`](../../components/catalogs/cayenne#create-table--like) to create staging tables that share partition routing with the target table.
-
-### Examples
-
-#### Update Matching Rows
-
-```sql
-MERGE INTO catalog.schema.customers AS t
-USING catalog.schema.customer_updates AS s
-ON t.id = s.id
-WHEN MATCHED THEN UPDATE SET name = s.name, email = s.email;
-```
-
-```text
-+-------+
-| count |
-+-------+
-| 42    |
-+-------+
-```
-
-#### Composite Join Keys
-
-```sql
-MERGE INTO catalog.schema.inventory AS t
-USING catalog.schema.new_stock AS s
-ON t.product_id = s.product_id AND t.warehouse_id = s.warehouse_id
-WHEN MATCHED THEN UPDATE SET quantity = s.quantity, updated_at = s.updated_at;
-```