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MDEV-26519: Improved histograms: Make JSON parser efficient

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Previous JSON parser was using an API which made the parsing
inefficient: the same JSON contents was parsed again and again.

Switch to using a lower-level parsing API which allows to do
parsing in an efficient way.
This commit is contained in:
Sergei Petrunia
2021-12-02 11:54:10 +03:00
parent be55ad0d34
commit 1d14176ec4
7 changed files with 358 additions and 188 deletions
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9
mysql-test/main/statistics_json.test
View File

@ -46,62 +46,53 @@ drop table ten;
UPDATE mysql.column_stats
SET histogram='["not-what-you-expect"]' WHERE table_name='t1_json';
FLUSH TABLES;
--error ER_JSON_HISTOGRAM_PARSE_FAILED
explain select * from t1_json limit 1;
UPDATE mysql.column_stats
SET histogram='{"histogram_hb_v2":"not-histogram"}' WHERE table_name='t1_json';
FLUSH TABLES;
--error ER_JSON_HISTOGRAM_PARSE_FAILED
explain select * from t1_json limit 1;
UPDATE mysql.column_stats
SET histogram='{"histogram_hb_v2":["not-a-bucket"]}'
WHERE table_name='t1_json';
FLUSH TABLES;
--error ER_JSON_HISTOGRAM_PARSE_FAILED
explain select * from t1_json limit 1;
UPDATE mysql.column_stats
SET histogram='{"histogram_hb_v2":[{"no-expected-members":1}]}'
WHERE table_name='t1_json';
FLUSH TABLES;
--error ER_JSON_HISTOGRAM_PARSE_FAILED
explain select * from t1_json limit 1;
UPDATE mysql.column_stats
SET histogram='{"histogram_hb_v2":[{"start":{}}]}'
WHERE table_name='t1_json';
FLUSH TABLES;
--error ER_JSON_HISTOGRAM_PARSE_FAILED
explain select * from t1_json limit 1;
UPDATE mysql.column_stats
SET histogram='{"histogram_hb_v2":[{"start":"aaa", "size":"not-an-integer"}]}'
WHERE table_name='t1_json';
FLUSH TABLES;
--error ER_JSON_HISTOGRAM_PARSE_FAILED
explain select * from t1_json limit 1;
UPDATE mysql.column_stats
SET histogram='{"histogram_hb_v2":[{"start":"aaa", "size":0.25}]}'
WHERE table_name='t1_json';
FLUSH TABLES;
--error ER_JSON_HISTOGRAM_PARSE_FAILED
explain select * from t1_json limit 1;
UPDATE mysql.column_stats
SET histogram='{"histogram_hb_v2":[{"start":"aaa", "size":0.25, "ndv":1}]}'
WHERE table_name='t1_json';
FLUSH TABLES;
--error ER_JSON_HISTOGRAM_PARSE_FAILED
explain select * from t1_json limit 1;
UPDATE mysql.column_stats
SET histogram='{"histogram_hb_v2":[]}'
WHERE table_name='t1_json';
FLUSH TABLES;
--error ER_JSON_HISTOGRAM_PARSE_FAILED
explain select * from t1_json limit 1;
--source include/have_sequence.inc