Add TPC-DS Phase 3: 8 more tables (catalog_sales, web_sales, and 6 others)

Implements the following tables in tpcds_benchmark:
  catalog_sales  — master-detail (callback-based, 4-14 line items/ticket)
  web_sales      — master-detail (callback-based, 8-16 line items/ticket)
  customer       — dimension table (simple, 100K rows at SF=1)
  item           — dimension table (simple, ~18K rows at SF=1)
  date_dim       — dimension table (simple, 73,049 fixed rows)
  store_returns  — driven through store_sales ticket loop
  catalog_returns — driven through catalog_sales ticket loop
  web_returns    — driven through web_sales ticket loop

Changes:
- tpcds_dsdgen.h: added struct definitions for all 8 new table row types,
  table ID constants, mk_w_* function declarations, and EMBEDDED_DSDGEN
  extern callback declarations for catalog_sales and web_sales
- dsdgen_wrapper.hpp: added generate_* method declarations for 8 tables
- dsdgen_wrapper.cpp: Arrow schemas, trampolines (catalog/web sales),
  generate_* implementations; returns tables are driven through their
  parent sales loop using a no-op callback to suppress file output while
  populating the global sales struct for valid return references
- dsdgen_converter.hpp/.cpp: Arrow builder converters for all 8 tables;
  updated append_dsdgen_row_to_builders() dispatcher
- tpcds_main.cpp: updated parse_table(), generation dispatch, and
  usage text to reflect Phase 3 completion
- third_party/tpcds submodule: updated to include w_catalog_sales.c
  and w_web_sales.c EMBEDDED_DSDGEN callback patches

All 10 implemented tables verified: correct row counts, sane values.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: tsafin

include/tpch/dsdgen_converter.hpp

@@ -30,6 +30,62 @@ void append_inventory_to_builders(
     const void* row,
     std::map<std::string, std::shared_ptr<arrow::ArrayBuilder>>& builders);
 
+/**
+ * Append a catalog_sales row (W_CATALOG_SALES_TBL*) to Arrow builders.
+ */
+void append_catalog_sales_to_builders(
+    const void* row,
+    std::map<std::string, std::shared_ptr<arrow::ArrayBuilder>>& builders);
+
+/**
+ * Append a web_sales row (W_WEB_SALES_TBL*) to Arrow builders.
+ */
+void append_web_sales_to_builders(
+    const void* row,
+    std::map<std::string, std::shared_ptr<arrow::ArrayBuilder>>& builders);
+
+/**
+ * Append a customer row (W_CUSTOMER_TBL*) to Arrow builders.
+ */
+void append_customer_to_builders(
+    const void* row,
+    std::map<std::string, std::shared_ptr<arrow::ArrayBuilder>>& builders);
+
+/**
+ * Append an item row (W_ITEM_TBL*) to Arrow builders.
+ */
+void append_item_to_builders(
+    const void* row,
+    std::map<std::string, std::shared_ptr<arrow::ArrayBuilder>>& builders);
+
+/**
+ * Append a date_dim row (W_DATE_TBL*) to Arrow builders.
+ */
+void append_date_dim_to_builders(
+    const void* row,
+    std::map<std::string, std::shared_ptr<arrow::ArrayBuilder>>& builders);
+
+/**
+ * Append a store_returns row (W_STORE_RETURNS_TBL*) to Arrow builders.
+ */
+void append_store_returns_to_builders(
+    const void* row,
+    std::map<std::string, std::shared_ptr<arrow::ArrayBuilder>>& builders);
+
+/**
+ * Append a catalog_returns row (W_CATALOG_RETURNS_TBL*) to Arrow builders.
+ */
+void append_catalog_returns_to_builders(
+    const void* row,
+    std::map<std::string, std::shared_ptr<arrow::ArrayBuilder>>& builders);
+
+/**
+ * Append a web_returns row (W_WEB_RETURNS_TBL*) to Arrow builders.
+ */
+void append_web_returns_to_builders(
+    const void* row,
+    std::map<std::string, std::shared_ptr<arrow::ArrayBuilder>>& builders);
+
 /**
  * Generic dispatcher by table name.
  */

include/tpch/dsdgen_wrapper.hpp

@@ -81,6 +81,70 @@ class DSDGenWrapper {
         std::function<void(const void* row)> callback,
         long max_rows = -1);
 
+    /**
+     * Generate catalog_sales rows (master-detail via callback).
+     * Calls callback once per line item with a const W_CATALOG_SALES_TBL*.
+     */
+    void generate_catalog_sales(
+        std::function<void(const void* row)> callback,
+        long max_rows = -1);
+
+    /**
+     * Generate web_sales rows (master-detail via callback).
+     * Calls callback once per line item with a const W_WEB_SALES_TBL*.
+     */
+    void generate_web_sales(
+        std::function<void(const void* row)> callback,
+        long max_rows = -1);
+
+    /**
+     * Generate customer rows.
+     * Calls callback once per row with a const W_CUSTOMER_TBL*.
+     */
+    void generate_customer(
+        std::function<void(const void* row)> callback,
+        long max_rows = -1);
+
+    /**
+     * Generate item rows.
+     * Calls callback once per row with a const W_ITEM_TBL*.
+     */
+    void generate_item(
+        std::function<void(const void* row)> callback,
+        long max_rows = -1);
+
+    /**
+     * Generate date_dim rows.
+     * Calls callback once per row with a const W_DATE_TBL*.
+     */
+    void generate_date_dim(
+        std::function<void(const void* row)> callback,
+        long max_rows = -1);
+
+    /**
+     * Generate store_returns rows.
+     * Calls callback once per row with a const W_STORE_RETURNS_TBL*.
+     */
+    void generate_store_returns(
+        std::function<void(const void* row)> callback,
+        long max_rows = -1);
+
+    /**
+     * Generate catalog_returns rows.
+     * Calls callback once per row with a const W_CATALOG_RETURNS_TBL*.
+     */
+    void generate_catalog_returns(
+        std::function<void(const void* row)> callback,
+        long max_rows = -1);
+
+    /**
+     * Generate web_returns rows.
+     * Calls callback once per row with a const W_WEB_RETURNS_TBL*.
+     */
+    void generate_web_returns(
+        std::function<void(const void* row)> callback,
+        long max_rows = -1);
+
     long scale_factor() const { return scale_factor_; }
 
     /**