junrushao commented on code in PR #12628:
URL: https://github.com/apache/tvm/pull/12628#discussion_r958076757
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include/tvm/meta_schedule/database.h:
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@@ -357,6 +357,18 @@ class Database : public runtime::ObjectRef {
*/
TVM_DLL static Database JSONDatabase(String path_workload, String
path_tuning_record,
bool allow_missing);
+ /*!
+ * \brief Create a database merged from multiple databases.
+ * \param preferred The preferred database. If the preferred database
responses to a query,
+ * all other databases will be ignored.
+ * \param databases The databases to be merged.
+ * \param fallback The fallback databases. If all the databases didn't
answer a query,
+ * the fallback databases will be used.
+ * \return The merged database.
+ */
+ TVM_DLL static Database MergedDatabase(Array<Database, void> preferred,
+ Array<Database, void> databases,
+ Array<Database, void> fallback);
Review Comment:
`Database` at that moment is an incomplete type, which won't pass Array's
static type checking which requires the `Database` to be a subclass of
`ObjectRef`, and therefore, we use the void-trick here
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