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This feature stores the ddls of the tables/views that are used in a query, to the optimizer trace. It is currently controlled by a system variable store_ddls_in_optimizer_trace, and is not enabled by default. All the ddls will be stored in a single json array, with each element having table/view name, and the associated create definition of the table/view. The approach taken is to read global query_tables from the thd->lex, and read them in reverse. Create a record with table_name, ddl of the table and add the table_name to the hash, along with dumping the information to the trace. dbName_plus_tableName is used as a key, and the duplicate entries are not added to the hash. The main suite tests are also run with the feature enabled, and they all succeed.