matrix_input.c File Reference

#include "c_common/vroom/matrix_input.h"

Include dependency graph for matrix_input.c:

Go to the source code of this file.

Functions
static void	db_get_matrix (char *matrix_sql, Vroom_matrix_t **matrix, size_t *total_matrix_rows, Column_info_t *info, const int column_count, bool is_plain)
static void	fetch_matrix (HeapTuple *tuple, TupleDesc *tupdesc, Column_info_t *info, Vroom_matrix_t *matrix, bool is_plain)
void	get_vroom_matrix (char *sql, Vroom_matrix_t **rows, size_t *total_rows, bool is_plain)
	Reads the VROOM matrix. More...

Function Documentation

db_get_matrix()

static void db_get_matrix ( char *  matrix_sql, Vroom_matrix_t **  matrix, size_t *  total_matrix_rows, Column_info_t *  info, const int  column_count, bool  is_plain  )

static

Definition at line 77 of file matrix_input.c.

                   {
#ifdef PROFILE
  clock_t start_t = clock();
  PGR_DBG("%s", matrix_sql);
#endif
 
  const int tuple_limit = 1000000;
 
  size_t total_tuples;
 
  void *SPIplan;
  SPIplan = pgr_SPI_prepare(matrix_sql);
  Portal SPIportal;
  SPIportal = pgr_SPI_cursor_open(SPIplan);
 
  bool moredata = true;
  (*total_matrix_rows) = total_tuples = 0;
 
  /* on the first tuple get the column numbers */
 
  while (moredata == true) {
    SPI_cursor_fetch(SPIportal, true, tuple_limit);
    if (total_tuples == 0) {
      pgr_fetch_column_info(info, column_count);
    }
    size_t ntuples = SPI_processed;
    total_tuples += ntuples;
    if (ntuples > 0) {
      if ((*matrix) == NULL)
        (*matrix) = (Vroom_matrix_t *)palloc0(
            total_tuples * sizeof(Vroom_matrix_t));
      else
        (*matrix) = (Vroom_matrix_t *)repalloc(
            (*matrix),
            total_tuples * sizeof(Vroom_matrix_t));
 
      if ((*matrix) == NULL) {
        elog(ERROR, "Out of memory");
      }
 
      size_t t;
      SPITupleTable *tuptable = SPI_tuptable;
      TupleDesc tupdesc = SPI_tuptable->tupdesc;
      for (t = 0; t < ntuples; t++) {
        HeapTuple tuple = tuptable->vals[t];
        fetch_matrix(&tuple, &tupdesc, info,
            &(*matrix)[total_tuples - ntuples + t], is_plain);
      }
      SPI_freetuptable(tuptable);
    } else {
      moredata = false;
    }
  }
 
  SPI_cursor_close(SPIportal);
 
  if (total_tuples == 0) {
    (*total_matrix_rows) = 0;
    return;
  }
 
  (*total_matrix_rows) = total_tuples;
#ifdef PROFILE
  time_msg("reading matrix", start_t, clock());
#endif
}

References fetch_matrix(), PGR_DBG, pgr_fetch_column_info(), pgr_SPI_cursor_open(), pgr_SPI_prepare(), and time_msg().

Referenced by get_vroom_matrix().

fetch_matrix()

static void fetch_matrix ( HeapTuple *  tuple, TupleDesc *  tupdesc, Column_info_t *  info, Vroom_matrix_t *  matrix, bool  is_plain  )

static

Definition at line 56 of file matrix_input.c.

                   {
  matrix->start_id = get_MatrixIndex(tuple, tupdesc, info[0], -1);
  matrix->end_id = get_MatrixIndex(tuple, tupdesc, info[1], -1);
 
  if (is_plain) {
    matrix->duration = get_Duration(tuple, tupdesc, info[2], 0);
  } else {
    matrix->duration = (Duration)get_PositiveTInterval(tuple, tupdesc, info[2], 0);
  }
 
  // If unspecified, cost is same as the duration
  matrix->cost = get_Cost(tuple, tupdesc, info[3], matrix->duration);
}

References Vroom_matrix_t::cost, Vroom_matrix_t::duration, Vroom_matrix_t::end_id, get_Cost(), get_Duration(), get_MatrixIndex(), get_PositiveTInterval(), and Vroom_matrix_t::start_id.

Referenced by db_get_matrix().

get_vroom_matrix()

void get_vroom_matrix	(	char *	sql,
		Vroom_matrix_t **	rows,
		size_t *	total_rows,
		bool	is_plain
	)

Reads the VROOM matrix.

Parameters

[in]	sql	SQL query that has the following columns: start_id, end_id, duration, cost
[in]	is_plain	Whether the plain or timestamp function is used
[out]	rows	C Container that holds all the matrix rows
[out]	total_rows	Total rows recieved

cost is not mandatory

Definition at line 159 of file matrix_input.c.

                   {
  int kColumnCount = 4;
  Column_info_t info[kColumnCount];
 
  for (int i = 0; i < kColumnCount; ++i) {
    info[i].colNumber = -1;
    info[i].type = 0;
    info[i].strict = true;
    info[i].eType = ANY_INTEGER;
  }
  info[0].name = "start_id";
  info[1].name = "end_id";
  info[2].name = "duration";
  info[3].name = "cost";
 
  info[2].eType = INTEGER;     // duration
  info[3].eType = INTEGER;     // cost
 
  if (!is_plain) {
    info[2].eType = INTERVAL;  // duration
  }
 
  info[3].strict = false;
 
  db_get_matrix(sql, rows, total_rows, info, kColumnCount, is_plain);
}

References ANY_INTEGER, Column_info_t::colNumber, db_get_matrix(), Column_info_t::eType, INTEGER, INTERVAL, Column_info_t::name, Column_info_t::strict, and Column_info_t::type.

Referenced by process().