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MDEV-406: ANALYZE $stmt: add support for BNL join buffering

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This commit is contained in:
Sergei Petrunia
2014-06-25 15:15:38 +04:00
parent c3cfb6910a
commit 7711999d8b
8 changed files with 122 additions and 26 deletions
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26
sql/sql_explain.h
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@@ -19,13 +19,13 @@ class Table_access_tracker
{
public:
Table_access_tracker() :
r_scans(0), r_rows(0), r_rows_after_table_cond(0),
r_scans(0), r_rows(0), /*r_rows_after_table_cond(0),*/
r_rows_after_where(0)
{}
ha_rows r_scans; /* How many scans were ran on this join_tab */
ha_rows r_rows; /* How many rows we've got after that */
ha_rows r_rows_after_table_cond; /* Rows after applying the table condition */
// ha_rows r_rows_after_table_cond; /* Rows after applying the table condition */
ha_rows r_rows_after_where; /* Rows after applying attached part of WHERE */
bool has_scans() { return (r_scans != 0); }
@@ -33,6 +33,17 @@ public:
{
return r_scans ? (ha_rows)rint((double) r_rows / r_scans): 0;
}
double get_filtered_after_where()
{
double r_filtered;
if (r_rows > 0)
r_filtered= (double)r_rows_after_where / r_rows;
else
r_filtered= 1.0;
return r_filtered;
}
};
@@ -371,13 +382,17 @@ enum explain_extra_tag
};
typedef struct st_explain_bka_type
class EXPLAIN_BKA_TYPE
{
public:
EXPLAIN_BKA_TYPE() : join_alg(NULL) {}
bool incremental;
const char *join_alg;
StringBuffer<64> mrr_type;
} EXPLAIN_BKA_TYPE;
bool is_using_jbuf() { return (join_alg != NULL); }
};
/*
@@ -517,6 +532,7 @@ public:
/* ANALYZE members*/
Table_access_tracker tracker;
Table_access_tracker jbuf_tracker;
private:
void append_tag_name(String *str, enum explain_extra_tag tag);