table_esmh_by_digest.h

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/* Copyright (c) 2016, 2022, Oracle and/or its affiliates.
 
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  */
 
#ifndef TABLE_ESMH_BY_DIGEST_H
#define TABLE_ESMH_BY_DIGEST_H
 
/**
  @file storage/perfschema/table_esmh_by_digest.h
  Table EVENTS_STATEMENTS_HISTOGRAM_BY_DIGEST (declarations).
*/
 
#include "storage/perfschema/pfs_digest.h"
#include "storage/perfschema/table_helper.h"
 
/**
  @addtogroup performance_schema_tables
  @{
*/
 
/**
  Position of a cursor on
  PERFORMANCE_SCHEMA.EVENTS_STATEMENTS_HISTOGRAM_BY_DIGEST.
  Index 1 on digest array (0 based).
  Index 2 on buckets (0 based).
*/
struct pos_esmh_by_digest : public PFS_double_index {
  pos_esmh_by_digest() : PFS_double_index(0, 0) {}
 
  inline void reset(void) {
    m_index_1 = 0;
    m_index_2 = 0;
  }
 
  inline bool has_more_digest(void) { return (m_index_1 < digest_max); }
 
  inline void next_digest(void) {
    m_index_1++;
    m_index_2 = 0;
  }
 
  inline bool has_more_buckets(void) { return (m_index_2 < NUMBER_OF_BUCKETS); }
 
  inline void next_bucket(void) { m_index_2++; }
};
 
class PFS_index_esmh_by_digest : public PFS_engine_index {
 public:
  PFS_index_esmh_by_digest()
      : PFS_engine_index(&m_key_1, &m_key_2, &m_key_3),
        m_key_1("SCHEMA_NAME"),
        m_key_2("DIGEST"),
        m_key_3("BUCKET_NUMBER") {}
 
  ~PFS_index_esmh_by_digest() override = default;
 
  bool match_digest(PFS_statements_digest_stat *pfs);
  bool match_bucket(ulong bucket_index);
 
 private:
  PFS_key_schema m_key_1;
  PFS_key_digest m_key_2;
  PFS_key_bucket_number m_key_3;
};
 
/**
  A row of table
  PERFORMANCE_SCHEMA.EVENTS_STATEMENTS_HISTOGRAM_BY_DIGEST.
*/
 
struct PFS_esmh_by_digest_bucket {
  /** Column COUNT_BUCKET. */
  ulonglong m_count_bucket;
  /** Column COUNT_BUCKET_AND_LOWER. */
  ulonglong m_count_bucket_and_lower;
};
 
struct PFS_esmh_by_digest_histogram {
  /** Columns SCHEMA_NAME, DIGEST. */
  PFS_digest_row m_digest;
 
  /** Statistics for all buckets. */
  PFS_esmh_by_digest_bucket m_buckets[NUMBER_OF_BUCKETS];
};
 
struct row_esmh_by_digest {
  /*
    No need to repeat SCHEMA_NAME, DIGEST here,
    only materialize the parts of the row that changes per bucket.
  */
  /** 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_BY_DIGEST. */
class table_esmh_by_digest : public PFS_engine_table {
  typedef pos_esmh_by_digest 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(void) 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_by_digest();
 
 public:
  ~table_esmh_by_digest() override = default;
 
 protected:
  void materialize(PFS_statements_digest_stat *stat);
  int make_row(PFS_statements_digest_stat *stat, ulong bucket_index);
 
 private:
  /** Table share lock. */
  static THR_LOCK m_table_lock;
  /** Table definition. */
  static Plugin_table m_table_def;
 
  /** Current row. */
  PFS_statements_digest_stat *m_materialized_digest;
  PFS_esmh_by_digest_histogram m_materialized_histogram;
  row_esmh_by_digest m_row;
  /** Current position. */
  pos_t m_pos;
  /** Next position. */
  pos_t m_next_pos;
 
  PFS_index_esmh_by_digest *m_opened_index;
};
 
/** @} */
#endif