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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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6
sql/opt_histogram_json.h
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@@ -76,7 +76,8 @@ class Histogram_json_hb : public Histogram_base
public:
static constexpr const char* JSON_NAME="histogram_hb_v2";
bool parse(MEM_ROOT *mem_root, Field *field, Histogram_type type_arg,
bool parse(MEM_ROOT *mem_root, const char *db_name, const char *table_name,
Field *field, Histogram_type type_arg,
const char *hist_data, size_t hist_data_len) override;
void serialize(Field *field) override;
@@ -122,6 +123,9 @@ public:
}
private:
int parse_bucket(json_engine_t *je, Field *field, double *cumulative_size,
bool *assigned_last_end, const char **err);
double get_left_fract(int idx);
std::string& get_end_value(int idx);
int find_bucket(const Field *field, const uchar *lookup_val, bool *equal);