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MDEV-18144: ANALYZE for statement support for PK filters

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ANALYZE and ANALYZE FORMAT=JSON structures are changed in the way that they
show additional information when rowid filter is used:

- r_selectivity_pct - the observed filter selectivity
- r_buffer_size - the size of the rowid filter container buffer
- r_filling_time_ms - how long it took to fill rowid filter container

New class Rowid_filter_tracker was added. This class is needed to collect data
about how rowid filter is executed.
This commit is contained in:
Galina Shalygina
2019-02-06 23:40:07 +03:00
parent e299ae5b07
commit 447e0f023f
11 changed files with 636 additions and 14 deletions
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2
sql/sql_class.cc
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@ -2728,7 +2728,7 @@ void THD::make_explain_field_list(List<Item> &field_list, uint8 explain_flags,
if (is_analyze)
{
field_list.push_back(item= new (mem_root)
Item_float(this, "r_rows", 0.1234, 10, 4),
Item_empty_string(this, "r_rows", NAME_CHAR_LEN, cs),
mem_root);
item->maybe_null=1;
}