table_esmh_global.h

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  */
 
#ifndef TABLE_ESMH_GLOBAL_H
#define TABLE_ESMH_GLOBAL_H
 
/**
  @file storage/perfschema/table_esmh_global.h
  Table EVENTS_STATEMENTS_HISTOGRAM_GLOBAL (declarations).
*/
 
#include "storage/perfschema/table_helper.h"
 
/**
  @addtogroup performance_schema_tables
  @{
*/
 
class PFS_index_esmh_global : public PFS_engine_index {
 public:
  PFS_index_esmh_global()
      : PFS_engine_index(&m_key_1), m_key_1("BUCKET_NUMBER") {}
 
  ~PFS_index_esmh_global() override = default;
 
  bool match_bucket(ulong bucket_index);
 
 private:
  PFS_key_bucket_number m_key_1;
};
 
/**
  A row of table
  PERFORMANCE_SCHEMA.EVENTS_STATEMENTS_HISTOGRAM_GLOBAL.
*/
 
struct PFS_esmh_global_bucket {
  /** Column BUCKET_NUMBER. */
  ulonglong m_count_bucket;
  /** Column COUNT_BUCKET_AND_LOWER. */
  ulonglong m_count_bucket_and_lower;
};
 
struct PFS_esmh_global_histogram {
  /** Statistics for all buckets. */
  PFS_esmh_global_bucket m_buckets[NUMBER_OF_BUCKETS];
};
 
struct row_esmh_global {
  /** Column BUCKET_NUMBER. */
  ulong m_bucket_number;
  /** Column BUCKET_TIMER_LOW. */
  ulonglong m_bucket_timer_low;
  /** Column BUCKET_TIMER_HIGH. */
  ulonglong m_bucket_timer_high;
  /** Column COUNT_BUCKET. */
  ulonglong m_count_bucket;
  /** Column COUNT_BUCKET_AND_LOWER. */
  ulonglong m_count_bucket_and_lower;
  /** Column BUCKET_QUANTILE. */
  double m_percentile;
};
 
/** Table PERFORMANCE_SCHEMA.EVENTS_STATEMENTS_HISTOGRAM_GLOBAL. */
class table_esmh_global : public PFS_engine_table {
  typedef PFS_simple_index pos_t;
 
 public:
  /** Table share */
  static PFS_engine_table_share m_share;
  static PFS_engine_table *create(PFS_engine_table_share *);
  static int delete_all_rows();
  static ha_rows get_row_count();
 
  void reset_position() override;
 
  int rnd_next() override;
  int rnd_pos(const void *pos) override;
 
  int index_init(uint idx, bool sorted) override;
  int index_next() override;
 
 protected:
  int read_row_values(TABLE *table, unsigned char *buf, Field **fields,
                      bool read_all) override;
 
  table_esmh_global();
 
 public:
  ~table_esmh_global() override = default;
 
 protected:
  void materialize();
  int make_row(ulong bucket_index);
 
 private:
  /** Table share lock. */
  static THR_LOCK m_table_lock;
  /** Table definition. */
  static Plugin_table m_table_def;
 
  /** Current row. */
  PFS_esmh_global_histogram m_materialized_histogram;
  row_esmh_global m_row;
  /** Current position. */
  pos_t m_pos;
  /** Next position. */
  pos_t m_next_pos;
 
  PFS_index_esmh_global *m_opened_index;
 
  bool m_materialized;
};
 
/** @} */
#endif