bsrikanth-mariadb 9dd9ea3928 MDEV-36511: Dump basic stats of a table to trace ...

This feature stores the basic stats of the base tables that are used in
a query, to the optimizer trace. This feature is also controlled by
optimizer_record_context, and is not enabled by default. The stats
such as num_of_records present in the table, indexes if present
then their names, along with the average number of records_per_key
with in each index are dumped to the trace. Additionally, stats from
range analysis of the queries are also dumped into the trace

The approach taken here is to extend the existing function
store_tables_context_in_trace() and add new dump_table_stats_to_trace()
to opt_trace_ddl_info.cc. For storing the range analysis stats into the
trace, they are first recorded in the hash defined in
Optimizer_Stats_Context_Recorder, and is used later while dumping the
stats into the trace from dump_table_stats_to_trace().
Several new tests are also added to opt_trace_store_stats.test

2026-08-12 14:31:52 +03:00

30 KiB

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