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MDEV-22665: Print ranges in the optimizer trace created for non-indexed columns when optimizer_use_condition_selectivity >2

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Now the optimizer trace shows the ranges constructed while getting estimates from EITS
This commit is contained in:
Varun Gupta
2020-05-22 21:15:17 +05:30
parent 205b0ce6ad
commit 4c3cbe2392
5 changed files with 240 additions and 38 deletions
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123
sql/opt_range.cc
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@ -442,6 +442,13 @@ static
void print_range(String *out, const KEY_PART_INFO *key_part,
KEY_MULTI_RANGE *range, uint n_key_parts);
static
void print_range_for_non_indexed_field(String *out, Field *field,
KEY_MULTI_RANGE *range);
static void print_min_range_operator(String *out, const ha_rkey_function flag);
static void print_max_range_operator(String *out, const ha_rkey_function flag);
/*
SEL_IMERGE is a list of possible ways to do index merge, i.e. it is
@ -3174,6 +3181,7 @@ static
double records_in_column_ranges(PARAM *param, uint idx,
SEL_ARG *tree)
{
THD *thd= param->thd;
SEL_ARG_RANGE_SEQ seq;
KEY_MULTI_RANGE range;
range_seq_t seq_it;
@ -3200,6 +3208,8 @@ double records_in_column_ranges(PARAM *param, uint idx,
seq_it= seq_if.init((void *) &seq, 0, flags);
Json_writer_array range_trace(thd, "ranges");
while (!seq_if.next(seq_it, &range))
{
key_range *min_endp, *max_endp;
@ -3216,6 +3226,13 @@ double records_in_column_ranges(PARAM *param, uint idx,
if (range.start_key.flag == HA_READ_BEFORE_KEY)
range_flag |= NEAR_MAX;
if (unlikely(thd->trace_started()))
{
StringBuffer<128> range_info(system_charset_info);
print_range_for_non_indexed_field(&range_info, field, &range);
range_trace.add(range_info.c_ptr_safe(), range_info.length());
}
rows= get_column_range_cardinality(field, min_endp, max_endp, range_flag);
if (DBL_MAX == rows)
{
@ -15804,6 +15821,37 @@ void QUICK_GROUP_MIN_MAX_SELECT::dbug_dump(int indent, bool verbose)
#endif /* !DBUG_OFF */
/*
@brief Print the comparison operator for the min range
*/
static void print_min_range_operator(String *out, const ha_rkey_function flag)
{
if (flag == HA_READ_AFTER_KEY)
out->append(STRING_WITH_LEN(" < "));
else if (flag == HA_READ_KEY_EXACT || flag == HA_READ_KEY_OR_NEXT)
out->append(STRING_WITH_LEN(" <= "));
else
out->append(STRING_WITH_LEN(" ? "));
}
/*
@brief Print the comparison operator for the max range
*/
static void print_max_range_operator(String *out, const ha_rkey_function flag)
{
if (flag == HA_READ_BEFORE_KEY)
out->append(STRING_WITH_LEN(" < "));
else if (flag == HA_READ_AFTER_KEY)
out->append(STRING_WITH_LEN(" <= "));
else
out->append(STRING_WITH_LEN(" ? "));
}
static
void print_range(String *out, const KEY_PART_INFO *key_part,
KEY_MULTI_RANGE *range, uint n_key_parts)
@ -15832,30 +15880,55 @@ void print_range(String *out, const KEY_PART_INFO *key_part,
{
print_key_value(out, key_part, range->start_key.key,
range->start_key.length);
if (range->start_key.flag == HA_READ_AFTER_KEY)
out->append(STRING_WITH_LEN(" < "));
else if (range->start_key.flag == HA_READ_KEY_EXACT ||
range->start_key.flag == HA_READ_KEY_OR_NEXT)
out->append(STRING_WITH_LEN(" <= "));
else
out->append(STRING_WITH_LEN(" ? "));
print_min_range_operator(out, range->start_key.flag);
}
print_keyparts_name(out, key_part, n_key_parts, keypart_map);
if (range->end_key.length)
{
if (range->end_key.flag == HA_READ_BEFORE_KEY)
out->append(STRING_WITH_LEN(" < "));
else if (range->end_key.flag == HA_READ_AFTER_KEY)
out->append(STRING_WITH_LEN(" <= "));
else
out->append(STRING_WITH_LEN(" ? "));
print_max_range_operator(out, range->end_key.flag);
print_key_value(out, key_part, range->end_key.key,
range->end_key.length);
}
}
/*
@brief Print range created for non-indexed columns
@param
out output string
field field for which the range is printed
range range for the field
*/
static
void print_range_for_non_indexed_field(String *out, Field *field,
KEY_MULTI_RANGE *range)
{
TABLE *table= field->table;
my_bitmap_map *old_sets[2];
dbug_tmp_use_all_columns(table, old_sets, table->read_set, table->write_set);
if (range->start_key.length)
{
field->print_key_part_value(out, range->start_key.key, field->key_length());
print_min_range_operator(out, range->start_key.flag);
}
out->append(field->field_name);
if (range->end_key.length)
{
print_max_range_operator(out, range->end_key.flag);
field->print_key_part_value(out, range->end_key.key, field->key_length());
}
dbug_tmp_restore_column_maps(table->read_set, table->write_set, old_sets);
}
/*
Add ranges to the trace
@ -15927,30 +16000,8 @@ static void print_key_value(String *out, const KEY_PART_INFO *key_part,
field= key_part->field;
store_length= key_part->store_length;
if (field->real_maybe_null())
{
/*
Byte 0 of key is the null-byte. If set, key is NULL.
Otherwise, print the key value starting immediately after the
null-byte
*/
if (*key)
{
out->append(STRING_WITH_LEN("NULL"));
goto next;
}
key++; // Skip null byte
store_length--;
}
field->print_key_part_value(out, key, key_part->length);
field->set_key_image(key, key_part->length);
field->print_key_value(&tmp, key_part->length);
if (field->charset() == &my_charset_bin)
out->append(tmp.ptr(), tmp.length(), tmp.charset());
else
tmp.print(out, system_charset_info);
next:
if (key + store_length < key_end)
out->append(STRING_WITH_LEN(","));
}