database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-08-01 03:47:19 +03:00
Code Activity

MDEV-16188: Use in-memory PK filters built from range index scans

Browse Source 
First phase: make optimizer choose to use filter and show it in EXPLAIN.
This commit is contained in:
Galina Shalygina
2018-08-16 00:24:52 +03:00
parent befc09f002
commit 8d5a11122c
17 changed files with 722 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
sql/sql_explain.cc
View File

@ -1146,6 +1146,15 @@ void Explain_table_access::fill_key_len_str(String *key_len_str) const
length= longlong10_to_str(hash_next_key.get_key_len(), buf, 10) - buf;
key_len_str->append(buf, length);
}
if (key.get_filter_key_length() != (uint)-1)
{
char buf[64];
size_t length;
key_len_str->append(',');
length= longlong10_to_str(key.get_filter_key_length(), buf, 10) - buf;
key_len_str->append(buf, length);
}
}
@ -1274,12 +1283,20 @@ int Explain_table_access::print_explain(select_result_sink *output, uint8 explai
push_string_list(thd, &item_list, ref_list, &ref_list_buf);
/* `rows` */
StringBuffer<64> rows_str;
if (rows_set)
{
rows_str.append_ulonglong((ulonglong)rows);
if (is_filter_set())
{
rows_str.append(" (");
rows_str.append_ulonglong(filter_perc);
rows_str.append("%)");
}
item_list.push_back(new (mem_root)
Item_int(thd, (longlong) (ulonglong) rows,
MY_INT64_NUM_DECIMAL_DIGITS),
mem_root);
Item_string_sys(thd, rows_str.ptr(),
rows_str.length()), mem_root);
}
else
item_list.push_back(item_null, mem_root);
@ -1359,6 +1376,15 @@ int Explain_table_access::print_explain(select_result_sink *output, uint8 explai
extra_buf.append(STRING_WITH_LEN("Using filesort"));
}
if (is_filter_set())
{
if (first)
first= false;
else
extra_buf.append(STRING_WITH_LEN("; "));
extra_buf.append(STRING_WITH_LEN("Using filter"));
}
item_list.push_back(new (mem_root)
Item_string_sys(thd, extra_buf.ptr(),
extra_buf.length()),