/*****************************************************************************

Copyright (c) 1996, 2024, Oracle and/or its affiliates.

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License, version 2.0, as published by the
Free Software Foundation.

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*****************************************************************************/

/** @file row/row0row.cc
 General row routines

 Created 4/20/1996 Heikki Tuuri
 *******************************************************/

#include "row0row.h"

#include <sys/types.h>

#include "btr0btr.h"
#include "data0type.h"
#include "dict0boot.h"
#include "dict0dict.h"
#include "ha_prototypes.h"
#include "lob0lob.h"
#include "mach0data.h"
#include "que0que.h"
#include "read0read.h"
#include "rem0cmp.h"
#include "row0ext.h"
#include "row0mysql.h"
#include "row0upd.h"
#include "trx0purge.h"
#include "trx0rec.h"
#include "trx0roll.h"
#include "trx0rseg.h"
#include "trx0trx.h"
#include "trx0undo.h"
#include "ut0mem.h"

dtuple_t *row_build_index_entry_low(const dtuple_t *row, const row_ext_t *ext,
                                    const dict_index_t *index, mem_heap_t *heap,
                                    ulint flag) {
  dtuple_t *entry;
  ulint entry_len;
  ulint i;
  ulint num_v = 0;

  entry_len = dict_index_get_n_fields(index);

  if (flag == ROW_BUILD_FOR_INSERT && index->is_clustered()) {
    num_v = dict_table_get_n_v_cols(index->table);
    entry_len = entry_len - index->table->get_n_instant_drop_cols();
    entry = dtuple_create_with_vcol(heap, entry_len, num_v);
  } else {
    entry = dtuple_create(heap, entry_len);
  }

  if (index->is_corrupted() && dict_index_has_virtual(index) &&
      dict_index_get_online_status(index) == ONLINE_INDEX_ABORTED_DROPPED) {
    /* See comments for virtual index in ddl::drop_indexes().
    In this case, just return the empty entry object */
    return (entry);
  }

  if (dict_index_is_ibuf(index)) {
    dtuple_set_n_fields_cmp(entry, entry_len);
    /* There may only be externally stored columns
    in a clustered index B-tree of a user table. */
    ut_a(!ext);
  } else {
    dtuple_set_n_fields_cmp(entry, dict_index_get_n_unique_in_tree(index));
  }

  for (i = 0; i < entry_len + num_v; i++) {
    const dict_field_t *ind_field = nullptr;
    const dict_col_t *col;
    ulint col_no = 0;
    dfield_t *dfield;
    dfield_t *dfield2;
    ulint len;

    if (i >= entry_len) {
      /* This is to insert new rows to cluster index */
      ut_ad(index->is_clustered() && flag == ROW_BUILD_FOR_INSERT);
      dfield = dtuple_get_nth_v_field(entry, i - entry_len);
      col = &dict_table_get_nth_v_col(index->table, i - entry_len)->m_col;

    } else {
      ind_field = index->get_field(i);
      col = ind_field->col;
      ut_ad(!col->is_instant_dropped());
      col_no = dict_col_get_no(col);
      dfield = dtuple_get_nth_field(entry, i);
    }
    static_assert(DATA_MISSING == 0, "DATA_MISSING != 0");

    if (col->is_virtual()) {
      const dict_v_col_t *v_col = reinterpret_cast<const dict_v_col_t *>(col);

      ut_ad(v_col->v_pos < dtuple_get_n_v_fields(row));
      dfield2 = dtuple_get_nth_v_field(row, v_col->v_pos);

      ut_ad(dfield_is_null(dfield2) || dfield2->len == UNIV_NO_INDEX_VALUE ||
            dfield2->data);
    } else {
      dfield2 = dtuple_get_nth_field(row, col_no);
      ut_ad(dfield_get_type(dfield2)->mtype == DATA_MISSING ||
            (!(dfield_get_type(dfield2)->prtype & DATA_VIRTUAL)));
    }

    if (UNIV_UNLIKELY(dfield_get_type(dfield2)->mtype == DATA_MISSING)) {
      /* The field has not been initialized in the row.
      This should be from trx_undo_rec_get_partial_row(). */
      return (nullptr);
    }

#ifdef UNIV_DEBUG
    if (dfield_get_type(dfield2)->prtype & DATA_VIRTUAL &&
        index->is_clustered()) {
      ut_ad(flag == ROW_BUILD_FOR_INSERT);
    }
#endif /* UNIV_DEBUG */

    /* Special handle spatial index, set the first field
    which is for store MBR. */
    if (dict_index_is_spatial(index) && i == 0) {
      double *mbr;

      dfield_copy(dfield, dfield2);
      dfield->type.prtype |= DATA_GIS_MBR;

      /* Allocate memory for mbr field */
      ulint mbr_len = DATA_MBR_LEN;
      mbr = static_cast<double *>(mem_heap_alloc(heap, mbr_len));

      /* Set mbr field data. */
      dfield_set_data(dfield, mbr, mbr_len);

      if (dfield2->data) {
        uchar *dptr = nullptr;
        ulint dlen = 0;
        ulint flen = 0;
        double tmp_mbr[SPDIMS * 2];
        mem_heap_t *temp_heap = nullptr;

        if (dfield_is_ext(dfield2)) {
          if (flag == ROW_BUILD_FOR_PURGE) {
            byte *ptr = nullptr;

            spatial_status_t spatial_status;
            spatial_status = dfield_get_spatial_status(dfield2);

            switch (spatial_status) {
              case SPATIAL_ONLY:
                ptr = static_cast<byte *>(dfield_get_data(dfield2));
                ut_ad(dfield_get_len(dfield2) == DATA_MBR_LEN);
                break;

              case SPATIAL_MIXED:
                ptr = static_cast<byte *>(dfield_get_data(dfield2)) +
                      dfield_get_len(dfield2);
                break;

              case SPATIAL_NONE:
                /* Undo record is logged before
                spatial index is created.*/
                return (nullptr);

              case SPATIAL_UNKNOWN:
                ut_d(ut_error);
            }

            memcpy(mbr, ptr, DATA_MBR_LEN);
            continue;
          }

          if (flag == ROW_BUILD_FOR_UNDO &&
              dict_table_has_atomic_blobs(index->table)) {
            /* For build entry for undo, and
            the table is Barrcuda, we need
            to skip the prefix data. */
            flen = BTR_EXTERN_FIELD_REF_SIZE;
            ut_ad(dfield_get_len(dfield2) >= BTR_EXTERN_FIELD_REF_SIZE);
            dptr = static_cast<byte *>(dfield_get_data(dfield2)) +
                   dfield_get_len(dfield2) - BTR_EXTERN_FIELD_REF_SIZE;
          } else {
            flen = dfield_get_len(dfield2);
            dptr = static_cast<byte *>(dfield_get_data(dfield2));
          }

          temp_heap = mem_heap_create(100, UT_LOCATION_HERE);

          const page_size_t page_size =
              (ext != nullptr) ? ext->page_size
                               : dict_table_page_size(index->table);

          const dict_index_t *clust_index =
              (ext == nullptr ? index->table->first_index() : ext->index);

          dptr = lob::btr_copy_externally_stored_field(
              nullptr, clust_index, &dlen, nullptr, dptr, page_size, flen,
              false, temp_heap);
        } else {
          dptr = static_cast<uchar *>(dfield_get_data(dfield2));
          dlen = dfield_get_len(dfield2);
        }

        if (dlen <= GEO_DATA_HEADER_SIZE) {
          for (uint i = 0; i < SPDIMS; ++i) {
            tmp_mbr[i * 2] = DBL_MAX;
            tmp_mbr[i * 2 + 1] = -DBL_MAX;
          }
        } else {
          get_mbr_from_store(index->rtr_srs.get(), dptr,
                             static_cast<uint>(dlen), SPDIMS, tmp_mbr, nullptr);
        }
        dfield_write_mbr(dfield, tmp_mbr);
        if (temp_heap) {
          mem_heap_free(temp_heap);
        }
      }
      continue;
    }

    len = dfield_get_len(dfield2);

    dfield_copy(dfield, dfield2);

    if (dfield_is_null(dfield)) {
      continue;
    }

    if ((!ind_field || ind_field->prefix_len == 0) &&
        (!dfield_is_ext(dfield) || index->is_clustered())) {
      /* The dfield_copy() above suffices for
      columns that are stored in-page, or for
      clustered index record columns that are not
      part of a column prefix in the PRIMARY KEY,
      or for virtual columns in cluster index record. */
      continue;
    }

    /* If the column is stored externally (off-page) in
    the clustered index, it must be an ordering field in
    the secondary index. If !atomic_blobs, the only way
    we may have a secondary index pointing to a clustered
    index record with an off-page column is when it is a
    column prefix index. If atomic_blobs, also fully
    indexed long columns may be stored off-page. */
    ut_ad(col->ord_part);

    if (ext && !col->is_virtual()) {
      /* See if the column is stored externally. */
      const byte *buf = row_ext_lookup(ext, col_no, &len);
      if (UNIV_LIKELY_NULL(buf)) {
        if (UNIV_UNLIKELY(buf == field_ref_zero)) {
          return (nullptr);
        }
        dfield_set_data(dfield, buf, len);
      }

      if (ind_field->prefix_len == 0) {
        /* If ROW_FORMAT=DYNAMIC or
        ROW_FORMAT=COMPRESSED, we can have a
        secondary index on an entire column
        that is stored off-page in the
        clustered index. As this is not a
        prefix index (prefix_len == 0),
        include the entire off-page column in
        the secondary index record. */
        continue;
      }
    } else if (dfield_is_ext(dfield)) {
      /* This table is either in
      (ROW_FORMAT=REDUNDANT or ROW_FORMAT=COMPACT)
      or a purge record where the ordered part of
      the field is not external.
      In ROW_FORMAT=REDUNDANT and ROW_FORMAT=COMPACT,
      the maximum column prefix
      index length is 767 bytes, and the clustered
      index record contains a 768-byte prefix of
      each off-page column. */
      ut_a(len >= BTR_EXTERN_FIELD_REF_SIZE);
      len -= BTR_EXTERN_FIELD_REF_SIZE;
      dfield_set_len(dfield, len);
    }

    /* If a column prefix index, take only the prefix. */
    if (ind_field->prefix_len) {
      len = dtype_get_at_most_n_mbchars(
          col->prtype, col->mbminmaxlen, ind_field->prefix_len, len,
          static_cast<char *>(dfield_get_data(dfield)));
      dfield_set_len(dfield, len);
    }
  }

  return (entry);
}

/** An inverse function to row_build_index_entry. Builds a row from a
record in a clustered index, with possible indexing on ongoing
addition of new virtual columns.
@param[in]      type            ROW_COPY_POINTERS or ROW_COPY_DATA;
@param[in]      index           clustered index
@param[in]      rec             record in the clustered index
@param[in]      offsets         rec_get_offsets(rec,index) or NULL
@param[in]      col_table       table, to check which
                                externally stored columns
                                occur in the ordering columns
                                of an index, or NULL if
                                index->table should be
                                consulted instead
@param[in]      add_cols        default values of added columns, or NULL
@param[in]      add_v           new virtual columns added
                                along with new indexes
@param[in]      col_map         mapping of old column
                                numbers to new ones, or NULL
@param[in]      ext             cache of externally stored column
                                prefixes, or NULL
@param[in]      heap            memory heap from which
                                the memory needed is allocated
@return own: row built; */
static inline dtuple_t *row_build_low(ulint type, const dict_index_t *index,
                                      const rec_t *rec, const ulint *offsets,
                                      const dict_table_t *col_table,
                                      const dtuple_t *add_cols,
                                      const dict_add_v_col_t *add_v,
                                      const ulint *col_map, row_ext_t **ext,
                                      mem_heap_t *heap) {
  const byte *copy;
  dtuple_t *row;
  ulint n_ext_cols;
  ulint *ext_cols = nullptr; /* remove warning */
  ulint len;
  byte *buf;
  ulint j;
  mem_heap_t *tmp_heap = nullptr;
  ulint offsets_[REC_OFFS_NORMAL_SIZE];
  rec_offs_init(offsets_);

  ut_ad(index != nullptr);
  ut_ad(rec != nullptr);
  ut_ad(heap != nullptr);
  ut_ad(index->is_clustered());
  ut_ad(!trx_sys_mutex_own());
  ut_ad(!col_map || col_table);

  if (!offsets) {
    offsets = rec_get_offsets(rec, index, offsets_, ULINT_UNDEFINED,
                              UT_LOCATION_HERE, &tmp_heap);
  } else {
    ut_ad(rec_offs_validate(rec, index, offsets));
  }

#if defined UNIV_DEBUG || defined UNIV_BLOB_LIGHT_DEBUG
  /* Some blob refs can be NULL during crash recovery before
  trx_rollback_active() has completed execution, or when a concurrently
  executing insert or update has committed the B-tree mini-transaction
  but has not yet managed to restore the cursor position for writing
  the big_rec. Note that the mini-transaction can be committed multiple
  times, and the cursor restore can happen multiple times for single
  insert or update statement.  */
  ut_a(!rec_offs_any_null_extern(index, rec, offsets) ||
       trx_rw_is_active(row_get_rec_trx_id(rec, index, offsets), false));
#endif /* UNIV_DEBUG || UNIV_BLOB_LIGHT_DEBUG */

  if (type != ROW_COPY_POINTERS) {
    /* Take a copy of rec to heap */
    buf = static_cast<byte *>(mem_heap_alloc(heap, rec_offs_size(offsets)));

    copy = rec_copy(buf, rec, offsets);
  } else {
    copy = rec;
  }

  n_ext_cols = rec_offs_n_extern(index, offsets);
  if (n_ext_cols) {
    ext_cols = static_cast<ulint *>(
        mem_heap_alloc(heap, n_ext_cols * sizeof *ext_cols));
  }

  /* Avoid a debug assertion in rec_offs_validate(). */
  rec_offs_make_valid(copy, index, const_cast<ulint *>(offsets));

  if (!col_table) {
    ut_ad(!col_map);
    ut_ad(!add_cols);
    col_table = index->table;
  }

  if (add_cols) {
    ut_ad(col_map);
    row = dtuple_copy(add_cols, heap);
    /* dict_table_copy_types() would set the fields to NULL */
    for (ulint i = 0; i < col_table->get_n_cols(); i++) {
      col_table->get_col(i)->copy_type(
          dfield_get_type(dtuple_get_nth_field(row, i)));
    }
  } else if (add_v != nullptr) {
    row = dtuple_create_with_vcol(
        heap, col_table->get_n_cols(),
        dict_table_get_n_v_cols(col_table) + add_v->n_v_col);
    dict_table_copy_types(row, col_table);

    for (ulint i = 0; i < add_v->n_v_col; i++) {
      add_v->v_col[i].m_col.copy_type(
          dfield_get_type(dtuple_get_nth_v_field(row, i + col_table->n_v_def)));
    }
  } else {
    row = dtuple_create_with_vcol(heap, col_table->get_n_cols(),
                                  dict_table_get_n_v_cols(col_table));
    dict_table_copy_types(row, col_table);
  }

  dtuple_set_info_bits(row, rec_get_info_bits(copy, rec_offs_comp(offsets)));

  j = 0;

  for (ulint i = 0; i < rec_offs_n_fields(offsets); i++) {
    const dict_field_t *ind_field = index->get_field(i);

    if (ind_field->prefix_len) {
      /* Column prefixes can only occur in key
      fields, which cannot be stored externally. For
      a column prefix, there should also be the full
      field in the clustered index tuple. The row
      tuple comprises full fields, not prefixes. */
      ut_ad(!rec_offs_nth_extern(index, offsets, i));
      continue;
    }

    const dict_col_t *col = ind_field->col;
    /* If this column has been dropped instantly, skip it. */
    if (col->is_instant_dropped()) {
      continue;
    }

    ulint col_no = dict_col_get_no(col);

    if (col_map) {
      col_no = col_map[col_no];

      if (col_no == ULINT_UNDEFINED) {
        /* dropped column */
        continue;
      }
    }

    dfield_t *dfield = dtuple_get_nth_field(row, col_no);

    const byte *field;

    field = rec_get_nth_field_instant(copy, offsets, i, index, &len);

    dfield_set_data(dfield, field, len);

    if (rec_offs_nth_extern(index, offsets, i)) {
      dfield_set_ext(dfield);

      col = col_table->get_col(col_no);

      if (col->ord_part) {
        /* We will have to fetch prefixes of
        externally stored columns that are
        referenced by column prefixes. */
        ext_cols[j++] = col_no;
      }
    }
  }

  rec_offs_make_valid(rec, index, const_cast<ulint *>(offsets));

  ut_ad(dtuple_check_typed(row));

  if (!ext) {
    /* REDUNDANT and COMPACT formats store a local
    768-byte prefix of each externally stored
    column. No cache is needed.

    During online table rebuild,
    row_log_table_apply_delete_low()
    may use a cache that was set up by
    row_log_table_delete(). */

  } else if (j) {
    *ext = row_ext_create(index, j, ext_cols, index->table->flags, row,
                          dict_index_is_sdi(index), heap);
  } else {
    *ext = nullptr;
  }

  if (tmp_heap) {
    mem_heap_free(tmp_heap);
  }

  return (row);
}

dtuple_t *row_build(ulint type, const dict_index_t *index, const rec_t *rec,
                    const ulint *offsets, const dict_table_t *col_table,
                    const dtuple_t *add_cols, const ulint *col_map,
                    row_ext_t **ext, mem_heap_t *heap) {
  return (row_build_low(type, index, rec, offsets, col_table, add_cols, nullptr,
                        col_map, ext, heap));
}

/** An inverse function to row_build_index_entry. Builds a row from a
record in a clustered index, with possible indexing on ongoing
addition of new virtual columns.
@param[in]      type            ROW_COPY_POINTERS or ROW_COPY_DATA;
@param[in]      index           clustered index
@param[in]      rec             record in the clustered index
@param[in]      offsets         rec_get_offsets(rec,index) or NULL
@param[in]      col_table       table, to check which
                                externally stored columns
                                occur in the ordering columns
                                of an index, or NULL if
                                index->table should be
                                consulted instead
@param[in]      add_cols        default values of added columns, or NULL
@param[in]      add_v           new virtual columns added
                                along with new indexes
@param[in]      col_map         mapping of old column
                                numbers to new ones, or NULL
@param[in]      ext             cache of externally stored column
                                prefixes, or NULL
@param[in]      heap            memory heap from which
                                the memory needed is allocated
@return own: row built */
dtuple_t *row_build_w_add_vcol(ulint type, const dict_index_t *index,
                               const rec_t *rec, const ulint *offsets,
                               const dict_table_t *col_table,
                               const dtuple_t *add_cols,
                               const dict_add_v_col_t *add_v,
                               const ulint *col_map, row_ext_t **ext,
                               mem_heap_t *heap) {
  return (row_build_low(type, index, rec, offsets, col_table, add_cols, add_v,
                        col_map, ext, heap));
}

/** Converts an index record to a typed data tuple.
 @return index entry built; does not set info_bits, and the data fields
 in the entry will point directly to rec */
dtuple_t *row_rec_to_index_entry_low(
    const rec_t *rec,          /*!< in: record in the index */
    const dict_index_t *index, /*!< in: index */
    const ulint *offsets,      /*!< in: rec_get_offsets(rec, index) */
    mem_heap_t *heap)          /*!< in: memory heap from which
                               the memory needed is allocated */
{
  dtuple_t *entry;
  dfield_t *dfield;
  ulint i;
  const byte *field;
  ulint len;
  ulint rec_len;

  ut_ad(rec != nullptr);
  ut_ad(heap != nullptr);
  ut_ad(index != nullptr);

  /* Because this function may be invoked by row0ddl.cc
  on a record whose header is in different format, the check
  rec_offs_validate(rec, index, offsets) must be avoided here. */

  rec_len = rec_offs_n_fields(offsets);

  entry = dtuple_create(heap, rec_len);

  dtuple_set_n_fields_cmp(entry, dict_index_get_n_unique_in_tree(index));

  ut_ad(rec_len == dict_index_get_n_fields(index) ||
        /* non-leaf record which has keys and child page no as record data */
        rec_len == dict_index_get_n_unique(index) + 1
        /* a record for older SYS_INDEXES table
        (missing merge_threshold column) is acceptable. */
        || (index->table->id == DICT_INDEXES_ID &&
            rec_len == dict_index_get_n_fields(index) - 1));

  dict_index_copy_types(entry, index, rec_len);

  for (i = 0; i < rec_len; i++) {
    dfield = dtuple_get_nth_field(entry, i);

    field = rec_get_nth_field_instant(rec, offsets, i, index, &len);

    dfield_set_data(dfield, field, len);

    if (rec_offs_nth_extern(index, offsets, i)) {
      dfield_set_ext(dfield);
    }
  }

  ut_ad(dtuple_check_typed(entry));

  return (entry);
}

/** Converts an index record to a typed data tuple. NOTE that externally
 stored (often big) fields are NOT copied to heap.
 @return own: index entry built */
dtuple_t *row_rec_to_index_entry(
    const rec_t *rec,          /*!< in: record in the index */
    const dict_index_t *index, /*!< in: index */
    const ulint *offsets,      /*!< in: rec_get_offsets(rec) */
    mem_heap_t *heap)          /*!< in: memory heap from which
                               the memory needed is allocated */
{
  dtuple_t *entry;
  byte *buf;
  const rec_t *copy_rec;
  DBUG_TRACE;

  ut_ad(rec != nullptr);
  ut_ad(heap != nullptr);
  ut_ad(index != nullptr);
  ut_ad(rec_offs_validate(rec, index, offsets));

  /* Take a copy of rec to heap */
  buf = static_cast<byte *>(mem_heap_alloc(heap, rec_offs_size(offsets)));

  copy_rec = rec_copy(buf, rec, offsets);

  rec_offs_make_valid(copy_rec, index, const_cast<ulint *>(offsets));
  entry = row_rec_to_index_entry_low(copy_rec, index, offsets, heap);
  rec_offs_make_valid(rec, index, const_cast<ulint *>(offsets));

  dtuple_set_info_bits(entry, rec_get_info_bits(rec, rec_offs_comp(offsets)));

  return entry;
}

/** Builds from a secondary index record a row reference with which we can
 search the clustered index record.
 @return own: row reference built; see the NOTE below! */
dtuple_t *row_build_row_ref(
    ulint type,                /*!< in: ROW_COPY_DATA, or ROW_COPY_POINTERS:
                               the former copies also the data fields to
                               heap, whereas the latter only places pointers
                               to data fields on the index page */
    const dict_index_t *index, /*!< in: secondary index */
    const rec_t *rec,          /*!< in: record in the index;
                               NOTE: in the case ROW_COPY_POINTERS
                               the data fields in the row will point
                               directly into this record, therefore,
                               the buffer page of this record must be
                               at least s-latched and the latch held
                               as long as the row reference is used! */
    mem_heap_t *heap)          /*!< in: memory heap from which the memory
                               needed is allocated */
{
  dict_table_t *table;
  dict_index_t *clust_index;
  dfield_t *dfield;
  dtuple_t *ref;
  const byte *field;
  ulint len;
  ulint ref_len;
  ulint pos;
  byte *buf;
  ulint clust_col_prefix_len;
  ulint i;
  mem_heap_t *tmp_heap = nullptr;
  ulint offsets_[REC_OFFS_NORMAL_SIZE];
  ulint *offsets = offsets_;
  rec_offs_init(offsets_);

  ut_ad(index != nullptr);
  ut_ad(rec != nullptr);
  ut_ad(heap != nullptr);
  ut_ad(!index->is_clustered());

  offsets = rec_get_offsets(rec, index, offsets, ULINT_UNDEFINED,
                            UT_LOCATION_HERE, &tmp_heap);
  /* Secondary indexes must not contain externally stored columns. */
  ut_ad(!rec_offs_any_extern(offsets));

  if (type == ROW_COPY_DATA) {
    /* Take a copy of rec to heap */

    buf = static_cast<byte *>(mem_heap_alloc(heap, rec_offs_size(offsets)));

    rec = rec_copy(buf, rec, offsets);
    /* Avoid a debug assertion in rec_offs_validate(). */
    rec_offs_make_valid(rec, index, offsets);
  }

  table = index->table;

  clust_index = table->first_index();

  ref_len = dict_index_get_n_unique(clust_index);

  ref = dtuple_create(heap, ref_len);

  dict_index_copy_types(ref, clust_index, ref_len);

  for (i = 0; i < ref_len; i++) {
    dfield = dtuple_get_nth_field(ref, i);

    pos = dict_index_get_nth_field_pos(index, clust_index, i);

    ut_a(pos != ULINT_UNDEFINED);

    field = rec_get_nth_field(index, rec, offsets, pos, &len);

    dfield_set_data(dfield, field, len);

    /* If the primary key contains a column prefix, then the
    secondary index may contain a longer prefix of the same
    column, or the full column, and we must adjust the length
    accordingly. */

    clust_col_prefix_len = clust_index->get_field(i)->prefix_len;

    if (clust_col_prefix_len > 0) {
      if (len != UNIV_SQL_NULL) {
        const dtype_t *dtype = dfield_get_type(dfield);

        dfield_set_len(dfield, dtype_get_at_most_n_mbchars(
                                   dtype->prtype, dtype->mbminmaxlen,
                                   clust_col_prefix_len, len, (char *)field));
      }
    }
  }

  ut_ad(dtuple_check_typed(ref));
  if (tmp_heap) {
    mem_heap_free(tmp_heap);
  }

  return (ref);
}

void row_build_row_ref_in_tuple(dtuple_t *ref, const rec_t *rec,
                                const dict_index_t *index, ulint *offsets) {
  const dict_index_t *clust_index;
  dfield_t *dfield;
  const byte *field;
  ulint len;
  ulint ref_len;
  ulint pos;
  ulint clust_col_prefix_len;
  ulint i;
  mem_heap_t *heap = nullptr;
  ulint offsets_[REC_OFFS_NORMAL_SIZE];
  rec_offs_init(offsets_);

  ut_a(ref);
  ut_a(index);
  ut_a(rec);
  ut_ad(!index->is_clustered());
  ut_a(index->table);

  clust_index = index->table->first_index();
  ut_ad(clust_index);

  if (!offsets) {
    offsets = rec_get_offsets(rec, index, offsets_, ULINT_UNDEFINED,
                              UT_LOCATION_HERE, &heap);
  } else {
    ut_ad(rec_offs_validate(rec, index, offsets));
  }

  /* Secondary indexes must not contain externally stored columns. */
  ut_ad(!rec_offs_any_extern(offsets));
  ref_len = dict_index_get_n_unique(clust_index);

  ut_ad(ref_len == dtuple_get_n_fields(ref));

  dict_index_copy_types(ref, clust_index, ref_len);

  for (i = 0; i < ref_len; i++) {
    dfield = dtuple_get_nth_field(ref, i);

    pos = dict_index_get_nth_field_pos(index, clust_index, i);

    ut_a(pos != ULINT_UNDEFINED);

    field = rec_get_nth_field(index, rec, offsets, pos, &len);

    dfield_set_data(dfield, field, len);

    /* If the primary key contains a column prefix, then the
    secondary index may contain a longer prefix of the same
    column, or the full column, and we must adjust the length
    accordingly. */

    clust_col_prefix_len = clust_index->get_field(i)->prefix_len;

    if (clust_col_prefix_len > 0) {
      if (len != UNIV_SQL_NULL) {
        const dtype_t *dtype = dfield_get_type(dfield);

        dfield_set_len(dfield, dtype_get_at_most_n_mbchars(
                                   dtype->prtype, dtype->mbminmaxlen,
                                   clust_col_prefix_len, len, (char *)field));
      }
    }
  }

  ut_ad(dtuple_check_typed(ref));
  if (UNIV_LIKELY_NULL(heap)) {
    mem_heap_free(heap);
  }
}

/** Searches the clustered index record for a row, if we have the row reference.
 @return true if found */
bool row_search_on_row_ref(btr_pcur_t *pcur, /*!< out: persistent cursor, which
                                              must be closed by the caller */
                           ulint mode,       /*!< in: BTR_MODIFY_LEAF, ... */
                           dict_table_t *table, /*!< in: table */
                           const dtuple_t *ref, /*!< in: row reference */
                           mtr_t *mtr)          /*!< in/out: mtr */
{
  ulint low_match;
  rec_t *rec;
  dict_index_t *index;

  ut_ad(dtuple_check_typed(ref));

  index = table->first_index();

  ut_a(dtuple_get_n_fields(ref) == dict_index_get_n_unique(index));

  pcur->open(index, 0, ref, PAGE_CUR_LE, mode, mtr, UT_LOCATION_HERE);

  low_match = pcur->get_low_match();

  rec = pcur->get_rec();

  if (page_rec_is_infimum(rec)) {
    return false;
  }

  if (low_match != dtuple_get_n_fields(ref)) {
    return false;
  }

  return true;
}

/** Fetches the clustered index record for a secondary index record. The latches
 on the secondary index record are preserved.
 @return record or NULL, if no record found */
rec_t *row_get_clust_rec(
    ulint mode,                 /*!< in: BTR_MODIFY_LEAF, ... */
    const rec_t *rec,           /*!< in: record in a secondary index */
    const dict_index_t *index,  /*!< in: secondary index */
    dict_index_t **clust_index, /*!< out: clustered index */
    mtr_t *mtr)                 /*!< in: mtr */
{
  mem_heap_t *heap;
  dtuple_t *ref;
  dict_table_t *table;
  btr_pcur_t pcur;
  rec_t *clust_rec;

  ut_ad(!index->is_clustered());

  table = index->table;

  heap = mem_heap_create(256, UT_LOCATION_HERE);

  ref = row_build_row_ref(ROW_COPY_POINTERS, index, rec, heap);

  auto found = row_search_on_row_ref(&pcur, mode, table, ref, mtr);

  clust_rec = found ? pcur.get_rec() : nullptr;

  mem_heap_free(heap);

  pcur.close();

  *clust_index = table->first_index();

  return (clust_rec);
}

/** Parse the integer data from specified field, which could be
DATA_INT, DATA_FLOAT or DATA_DOUBLE. We could return 0 if
1) the value is less than 0 and the type is not unsigned
or 2) the field is null.
@param[in]      field           field to read the int value
@return the integer value read from the field, 0 for negative signed
int or NULL field */
uint64_t row_parse_int_from_field(const dfield_t *field) {
  const dtype_t *dtype = dfield_get_type(field);
  ulint len = dfield_get_len(field);
  const byte *data = static_cast<const byte *>(dfield_get_data(field));
  ulint mtype = dtype_get_mtype(dtype);
  bool unsigned_type = dtype->prtype & DATA_UNSIGNED;

  if (dfield_is_null(field)) {
    return (0);
  } else {
    return (row_parse_int(data, len, mtype, unsigned_type));
  }
}

/** Read the autoinc counter from the clustered index row.
@param[in]      row     row to read the autoinc counter
@param[in]      n       autoinc counter is in the nth field
@return the autoinc counter read */
uint64_t row_get_autoinc_counter(const dtuple_t *row, ulint n) {
  const dfield_t *field = dtuple_get_nth_field(row, n);

  return (row_parse_int_from_field(field));
}

/** Searches an index record.
 @return whether the record was found or buffered */
enum row_search_result row_search_index_entry(
    dict_index_t *index,   /*!< in: index */
    const dtuple_t *entry, /*!< in: index entry */
    ulint mode,            /*!< in: BTR_MODIFY_LEAF, ... */
    btr_pcur_t *pcur,      /*!< in/out: persistent cursor, which must
                           be closed by the caller */
    mtr_t *mtr)            /*!< in: mtr */
{
  ulint n_fields;
  ulint low_match;
  rec_t *rec;

  ut_ad(dtuple_check_typed(entry));

  if (dict_index_is_spatial(index)) {
    ut_ad(mode & BTR_MODIFY_LEAF || mode & BTR_MODIFY_TREE);
    rtr_pcur_open(index, entry, PAGE_CUR_RTREE_LOCATE, mode, pcur,
                  UT_LOCATION_HERE, mtr);
  } else {
    pcur->open(index, 0, entry, PAGE_CUR_LE, mode, mtr, UT_LOCATION_HERE);
  }

  switch (pcur->get_btr_cur()->flag) {
    case BTR_CUR_UNSET:
      ut_d(ut_error);
      ut_o(break);

    case BTR_CUR_DELETE_REF:
      ut_a(mode & BTR_DELETE && !dict_index_is_spatial(index));
      return (ROW_NOT_DELETED_REF);

    case BTR_CUR_DEL_MARK_IBUF:
    case BTR_CUR_DELETE_IBUF:
    case BTR_CUR_INSERT_TO_IBUF:
      return (ROW_BUFFERED);

    case BTR_CUR_HASH:
    case BTR_CUR_HASH_NOT_ATTEMPTED:
    case BTR_CUR_HASH_FAIL:
    case BTR_CUR_BINARY:
      break;
  }

  low_match = pcur->get_low_match();

  rec = pcur->get_rec();

  n_fields = dtuple_get_n_fields(entry);

  if (page_rec_is_infimum(rec)) {
    return (ROW_NOT_FOUND);
  } else if (low_match != n_fields) {
    return (ROW_NOT_FOUND);
  }

  return (ROW_FOUND);
}

/** Formats the raw data in "data" (in InnoDB on-disk format) that is of
 type DATA_INT using "prtype" and writes the result to "buf".
 If the data is in unknown format, then nothing is written to "buf",
 0 is returned and "format_in_hex" is set to true, otherwise
 "format_in_hex" is left untouched.
 Not more than "buf_size" bytes are written to "buf".
 The result is always '\0'-terminated (provided buf_size > 0) and the
 number of bytes that were written to "buf" is returned (including the
 terminating '\0').
 @return number of bytes that were written */
static ulint row_raw_format_int(const char *data,    /*!< in: raw data */
                                ulint data_len,      /*!< in: raw data length
                                                     in bytes */
                                ulint prtype,        /*!< in: precise type */
                                char *buf,           /*!< out: output buffer */
                                ulint buf_size,      /*!< in: output buffer size
                                                     in bytes */
                                bool *format_in_hex) /*!< out: should the data
                                                      be formatted in hex */
{
  ulint ret;

  if (data_len <= sizeof(uint64_t)) {
    uint64_t value;
    bool unsigned_type = (prtype & DATA_UNSIGNED) != 0;

    value = mach_read_int_type((const byte *)data, data_len, unsigned_type);

    ret =
        snprintf(buf, buf_size, unsigned_type ? UINT64PF : "%" PRId64, value) +
        1;
  } else {
    *format_in_hex = true;
    ret = 0;
  }

  return (std::min(ret, buf_size));
}

/** Formats the raw data in "data" (in InnoDB on-disk format) that is of
 type DATA_(CHAR|VARCHAR|MYSQL|VARMYSQL) using "prtype" and writes the
 result to "buf".
 If the data is in binary format, then nothing is written to "buf",
 0 is returned and "format_in_hex" is set to true, otherwise
 "format_in_hex" is left untouched.
 Not more than "buf_size" bytes are written to "buf".
 The result is always '\0'-terminated (provided buf_size > 0) and the
 number of bytes that were written to "buf" is returned (including the
 terminating '\0').
 @return number of bytes that were written */
static ulint row_raw_format_str(const char *data,    /*!< in: raw data */
                                ulint data_len,      /*!< in: raw data length
                                                     in bytes */
                                ulint prtype,        /*!< in: precise type */
                                char *buf,           /*!< out: output buffer */
                                ulint buf_size,      /*!< in: output buffer size
                                                     in bytes */
                                bool *format_in_hex) /*!< out: should the data
                                                      be formatted in hex */
{
  ulint charset_coll;

  if (buf_size == 0) {
    return (0);
  }

  /* we assume system_charset_info is UTF-8 */

  charset_coll = dtype_get_charset_coll(prtype);

  if (UNIV_LIKELY(dtype_is_utf8(prtype))) {
    return (ut_str_sql_format(data, data_len, buf, buf_size));
  }
  /* else */

  if (charset_coll == DATA_MYSQL_BINARY_CHARSET_COLL) {
    *format_in_hex = true;
    return (0);
  }
  /* else */

  return (innobase_raw_format(data, data_len, charset_coll, buf, buf_size));
}

/** Formats the raw data in "data" (in InnoDB on-disk format) using
 "dict_field" and writes the result to "buf".
 Not more than "buf_size" bytes are written to "buf".
 The result is always NUL-terminated (provided buf_size is positive) and the
 number of bytes that were written to "buf" is returned (including the
 terminating NUL).
 @return number of bytes that were written */
ulint row_raw_format(const char *data,               /*!< in: raw data */
                     ulint data_len,                 /*!< in: raw data length
                                                     in bytes */
                     const dict_field_t *dict_field, /*!< in: index field */
                     char *buf,                      /*!< out: output buffer */
                     ulint buf_size)                 /*!< in: output buffer size
                                                     in bytes */
{
  ulint mtype;
  ulint prtype;
  ulint ret;
  bool format_in_hex;

  if (buf_size == 0) {
    return (0);
  }

  ut_ad(data_len != UNIV_SQL_ADD_COL_DEFAULT);

  if (data_len == UNIV_SQL_NULL) {
    ret = snprintf((char *)buf, buf_size, "NULL") + 1;

    return (std::min(ret, buf_size));
  }

  mtype = dict_field->col->mtype;
  prtype = dict_field->col->prtype;

  format_in_hex = false;

  switch (mtype) {
    case DATA_INT:

      ret = row_raw_format_int(data, data_len, prtype, buf, buf_size,
                               &format_in_hex);
      if (format_in_hex) {
        goto format_in_hex;
      }
      break;
    case DATA_CHAR:
    case DATA_VARCHAR:
    case DATA_MYSQL:
    case DATA_VARMYSQL:

      ret = row_raw_format_str(data, data_len, prtype, buf, buf_size,
                               &format_in_hex);
      if (format_in_hex) {
        goto format_in_hex;
      }

      break;
    /* XXX support more data types */
    default:
    format_in_hex:

      if (UNIV_LIKELY(buf_size > 2)) {
        memcpy(buf, "0x", 2);
        buf += 2;
        buf_size -= 2;
        ret = 2 + ut_raw_to_hex(data, data_len, buf, buf_size);
      } else {
        buf[0] = '\0';
        ret = 1;
      }
  }

  return (ret);
}

dfield_t *Multi_value_entry_builder_normal::find_multi_value_field() {
  for (size_t i = 0; i < m_row->n_v_fields; ++i) {
    const auto field = &m_row->v_fields[i];
    if (!dfield_is_multi_value(field)) {
      continue;
    }

    const auto vcol = dict_table_get_nth_v_col(m_index->table, i);
    m_mv_field_no = m_index->has_multi_value_col(vcol);

    if (m_mv_field_no == 0) {
      continue;
    }
    return field;
  }

  return nullptr;
}

#ifdef UNIV_ENABLE_UNIT_TEST_ROW_RAW_FORMAT_INT

#ifdef HAVE_UT_CHRONO_T

static inline void CALL_AND_TEST(char *data, ulint data_len, ulint prtype,
                                 char *buf, ulint buf_size, ulint ret_expected,
                                 char *buf_expected,
                                 int format_in_hex_expected) {
  bool ok = true;
  memset(buf, 'x', 10);
  buf[10] = '\0';
  format_in_hex = false;
  fprintf(stderr, "TESTING \"\\x");
  for (ulint i = 0; i < data_len; i++) {
    fprintf(stderr, "%02hhX", data[i]);
  }
  fprintf(stderr, "\", %lu, %lu, %lu\n", data_len, prtype, buf_size);
  auto ret =
      row_raw_format_int(data, data_len, prtype, buf, buf_size, &format_in_hex);
  if (ret != ret_expected) {
    fprintf(stderr, "expected ret %lu, got %lu\n", ret_expected, ret);
    ok = false;
  }
  if (strcmp(buf, buf_expected) != 0) {
    fprintf(stderr, "expected buf \"%s\", got \"%s\"\n", buf_expected, buf);
    ok = false;
  }
  if (format_in_hex != format_in_hex_expected) {
    fprintf(stderr, "expected format_in_hex %d, got %d\n",
            (int)format_in_hex_expected, (int)format_in_hex);
    ok = false;
  }
  if (ok) {
    fprintf(stderr, "OK: %lu, \"%s\" %d\n\n", (ulint)ret, buf,
            (int)format_in_hex);
  }
}

void test_row_raw_format_int() {
  char buf[128];
  bool format_in_hex;

  /* min values for signed 1-8 byte integers */

  CALL_AND_TEST("\x00", 1, 0, buf, sizeof(buf), 5, "-128", 0);

  CALL_AND_TEST("\x00\x00", 2, 0, buf, sizeof(buf), 7, "-32768", 0);

  CALL_AND_TEST("\x00\x00\x00", 3, 0, buf, sizeof(buf), 9, "-8388608", 0);

  CALL_AND_TEST("\x00\x00\x00\x00", 4, 0, buf, sizeof(buf), 12, "-2147483648",
                0);

  CALL_AND_TEST("\x00\x00\x00\x00\x00", 5, 0, buf, sizeof(buf), 14,
                "-549755813888", 0);

  CALL_AND_TEST("\x00\x00\x00\x00\x00\x00", 6, 0, buf, sizeof(buf), 17,
                "-140737488355328", 0);

  CALL_AND_TEST("\x00\x00\x00\x00\x00\x00\x00", 7, 0, buf, sizeof(buf), 19,
                "-36028797018963968", 0);

  CALL_AND_TEST("\x00\x00\x00\x00\x00\x00\x00\x00", 8, 0, buf, sizeof(buf), 21,
                "-9223372036854775808", 0);

  /* min values for unsigned 1-8 byte integers */

  CALL_AND_TEST("\x00", 1, DATA_UNSIGNED, buf, sizeof(buf), 2, "0", 0);

  CALL_AND_TEST("\x00\x00", 2, DATA_UNSIGNED, buf, sizeof(buf), 2, "0", 0);

  CALL_AND_TEST("\x00\x00\x00", 3, DATA_UNSIGNED, buf, sizeof(buf), 2, "0", 0);

  CALL_AND_TEST("\x00\x00\x00\x00", 4, DATA_UNSIGNED, buf, sizeof(buf), 2, "0",
                0);

  CALL_AND_TEST("\x00\x00\x00\x00\x00", 5, DATA_UNSIGNED, buf, sizeof(buf), 2,
                "0", 0);

  CALL_AND_TEST("\x00\x00\x00\x00\x00\x00", 6, DATA_UNSIGNED, buf, sizeof(buf),
                2, "0", 0);

  CALL_AND_TEST("\x00\x00\x00\x00\x00\x00\x00", 7, DATA_UNSIGNED, buf,
                sizeof(buf), 2, "0", 0);

  CALL_AND_TEST("\x00\x00\x00\x00\x00\x00\x00\x00", 8, DATA_UNSIGNED, buf,
                sizeof(buf), 2, "0", 0);

  /* max values for signed 1-8 byte integers */

  CALL_AND_TEST("\xFF", 1, 0, buf, sizeof(buf), 4, "127", 0);

  CALL_AND_TEST("\xFF\xFF", 2, 0, buf, sizeof(buf), 6, "32767", 0);

  CALL_AND_TEST("\xFF\xFF\xFF", 3, 0, buf, sizeof(buf), 8, "8388607", 0);

  CALL_AND_TEST("\xFF\xFF\xFF\xFF", 4, 0, buf, sizeof(buf), 11, "2147483647",
                0);

  CALL_AND_TEST("\xFF\xFF\xFF\xFF\xFF", 5, 0, buf, sizeof(buf), 13,
                "549755813887", 0);

  CALL_AND_TEST("\xFF\xFF\xFF\xFF\xFF\xFF", 6, 0, buf, sizeof(buf), 16,
                "140737488355327", 0);

  CALL_AND_TEST("\xFF\xFF\xFF\xFF\xFF\xFF\xFF", 7, 0, buf, sizeof(buf), 18,
                "36028797018963967", 0);

  CALL_AND_TEST("\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF", 8, 0, buf, sizeof(buf), 20,
                "9223372036854775807", 0);

  /* max values for unsigned 1-8 byte integers */

  CALL_AND_TEST("\xFF", 1, DATA_UNSIGNED, buf, sizeof(buf), 4, "255", 0);

  CALL_AND_TEST("\xFF\xFF", 2, DATA_UNSIGNED, buf, sizeof(buf), 6, "65535", 0);

  CALL_AND_TEST("\xFF\xFF\xFF", 3, DATA_UNSIGNED, buf, sizeof(buf), 9,
                "16777215", 0);

  CALL_AND_TEST("\xFF\xFF\xFF\xFF", 4, DATA_UNSIGNED, buf, sizeof(buf), 11,
                "4294967295", 0);

  CALL_AND_TEST("\xFF\xFF\xFF\xFF\xFF", 5, DATA_UNSIGNED, buf, sizeof(buf), 14,
                "1099511627775", 0);

  CALL_AND_TEST("\xFF\xFF\xFF\xFF\xFF\xFF", 6, DATA_UNSIGNED, buf, sizeof(buf),
                16, "281474976710655", 0);

  CALL_AND_TEST("\xFF\xFF\xFF\xFF\xFF\xFF\xFF", 7, DATA_UNSIGNED, buf,
                sizeof(buf), 18, "72057594037927935", 0);

  CALL_AND_TEST("\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF", 8, DATA_UNSIGNED, buf,
                sizeof(buf), 21, "18446744073709551615", 0);

  /* some random values */

  CALL_AND_TEST("\x52", 1, 0, buf, sizeof(buf), 4, "-46", 0);

  CALL_AND_TEST("\x0E", 1, DATA_UNSIGNED, buf, sizeof(buf), 3, "14", 0);

  CALL_AND_TEST("\x62\xCE", 2, 0, buf, sizeof(buf), 6, "-7474", 0);

  CALL_AND_TEST("\x29\xD6", 2, DATA_UNSIGNED, buf, sizeof(buf), 6, "10710", 0);

  CALL_AND_TEST("\x7F\xFF\x90", 3, 0, buf, sizeof(buf), 5, "-112", 0);

  CALL_AND_TEST("\x00\xA1\x16", 3, DATA_UNSIGNED, buf, sizeof(buf), 6, "41238",
                0);

  CALL_AND_TEST("\x7F\xFF\xFF\xF7", 4, 0, buf, sizeof(buf), 3, "-9", 0);

  CALL_AND_TEST("\x00\x00\x00\x5C", 4, DATA_UNSIGNED, buf, sizeof(buf), 3, "92",
                0);

  CALL_AND_TEST("\x7F\xFF\xFF\xFF\xFF\xFF\xDC\x63", 8, 0, buf, sizeof(buf), 6,
                "-9117", 0);

  CALL_AND_TEST("\x00\x00\x00\x00\x00\x01\x64\x62", 8, DATA_UNSIGNED, buf,
                sizeof(buf), 6, "91234", 0);

  /* speed test */

  ut_chrono_t ch(__func__);

  for (auto i = 0; i < 1000000; i++) {
    row_raw_format_int("\x23", 1, 0, buf, sizeof(buf), &format_in_hex);
    row_raw_format_int("\x23", 1, DATA_UNSIGNED, buf, sizeof(buf),
                       &format_in_hex);

    row_raw_format_int("\x00\x00\x00\x00\x00\x01\x64\x62", 8, 0, buf,
                       sizeof(buf), &format_in_hex);
    row_raw_format_int("\x00\x00\x00\x00\x00\x01\x64\x62", 8, DATA_UNSIGNED,
                       buf, sizeof(buf), &format_in_hex);
  }
}

#endif /* HAVE_UT_CHRONO_T */

#endif /* UNIV_ENABLE_UNIT_TEST_ROW_RAW_FORMAT_INT */
