MDEV-26519: Improved histograms: Make JSON parser efficient

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.

1 files changed, 0 insertions, 9 deletions

diff --git a/mysql-test/main/statistics_json.test b/mysql-test/main/statistics_json.test
index 23e5e7395a7..b0a1795c235 100644
--- a/mysql-test/main/statistics_json.test
+++ b/mysql-test/main/statistics_json.test
@@ -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