Hi!
Hello
I would like to ask about struct ST_SCHEMA_TABLE found in sql\tables.h
(version mysql-5.0.13-rc. If I am correct this struct didn't exist in
early 5.0 versions).
ST_SCHEMA_TABLE introduced in 5.0.3. This struct holds the information about
information_schema(I_S) tables(see sql_show.cc, ST_SCHEMA_TABLE schema_tables[] array).
What does this struct represent? I can't make it out :( I found it in
make_join_statistcs in the first for:
if (tables->schema_table)
table->file->records= 2;
It's used to skip optimization of I_S tables. After otimization
I_S tables are filled with data and the count of records is fixed to
real value (see sql_select.cc, JOIN::exec() and sql_show.cc,
get_schema_tables_result()).
if we have this schema_table then the records of the table are two.
The ST_SCHEMA_TABLE * TABLE_LIST::schema_table has the comment
"information_schema table"
Regards,
Gluh
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