breadthFirstSearch.c File Reference

#include <stdbool.h>
#include "c_common/postgres_connection.h"
#include "utils/array.h"
#include "c_common/debug_macro.h"
#include "c_common/e_report.h"
#include "c_common/time_msg.h"
#include "c_common/edges_input.h"
#include "c_common/arrays_input.h"
#include "drivers/breadthFirstSearch/breadthFirstSearch_driver.h"

Include dependency graph for breadthFirstSearch.c:

Go to the source code of this file.

Functions
PGDLLEXPORT Datum	_pgr_breadthfirstsearch (PG_FUNCTION_ARGS)
	PG_FUNCTION_INFO_V1 (_pgr_breadthfirstsearch)
static void	process (char *edges_sql, ArrayType *starts, int64_t max_depth, bool directed, pgr_mst_rt **result_tuples, size_t *result_count)

Function Documentation

_pgr_breadthfirstsearch()

PGDLLEXPORT Datum _pgr_breadthfirstsearch

(

PG_FUNCTION_ARGS

)

Definition at line 126 of file breadthFirstSearch.c.

                                                            {
    FuncCallContext *funcctx;
    TupleDesc tuple_desc;
 
    /**************************************************************************/
    pgr_mst_rt *result_tuples = NULL;
    size_t result_count = 0;
    /**************************************************************************/
 
    if (SRF_IS_FIRSTCALL()) {
        MemoryContext oldcontext;
        funcctx = SRF_FIRSTCALL_INIT();
        oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
 
        /**********************************************************************/
        /*
        pgr_breadthFirstSearch(
            edge_sql TEXT,
            start_vids ANYARRAY,
            max_depth BIGINT DEFAULT 9223372036854775807,
            directed BOOLEAN DEFAULT true)
        */
        /**********************************************************************/
 
        PGR_DBG("Calling process");
        process(
            text_to_cstring(PG_GETARG_TEXT_P(0)),
            PG_GETARG_ARRAYTYPE_P(1),
            PG_GETARG_INT64(2),
            PG_GETARG_BOOL(3),
            &result_tuples,
            &result_count);
 
        /**********************************************************************/
 
#if PGSQL_VERSION > 95
        funcctx->max_calls = result_count;
#else
        funcctx->max_calls = (uint32_t)result_count;
#endif
        funcctx->user_fctx = result_tuples;
        if (get_call_result_type(fcinfo, NULL, &tuple_desc) != TYPEFUNC_COMPOSITE) {
            ereport(ERROR,
                    (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                     errmsg("function returning record called in context "
                            "that cannot accept type record")));
        }
 
        funcctx->tuple_desc = tuple_desc;
        MemoryContextSwitchTo(oldcontext);
    }
 
    funcctx = SRF_PERCALL_SETUP();
    tuple_desc = funcctx->tuple_desc;
    result_tuples = (pgr_mst_rt *)funcctx->user_fctx;
 
    if (funcctx->call_cntr < funcctx->max_calls) {
        HeapTuple tuple;
        Datum result;
        Datum *values;
        bool *nulls;
 
        /**********************************************************************/
        /*
            OUT seq BIGINT,
            OUT depth BIGINT,
            OUT start_vid BIGINT,
            OUT node BIGINT,
            OUT edge BIGINT,
            OUT cost FLOAT,
            OUT agg_cost FLOAT
        */
        /**********************************************************************/
        size_t numb = 7;
        values = palloc(numb * sizeof(Datum));
        nulls = palloc(numb * sizeof(bool));
 
        size_t i;
        for (i = 0; i < numb; ++i) {
            nulls[i] = false;
        }
 
        values[0] = Int32GetDatum(funcctx->call_cntr + 1);
        values[1] = Int64GetDatum(result_tuples[funcctx->call_cntr].depth);
        values[2] = Int64GetDatum(result_tuples[funcctx->call_cntr].from_v);
        values[3] = Int64GetDatum(result_tuples[funcctx->call_cntr].node);
        values[4] = Int64GetDatum(result_tuples[funcctx->call_cntr].edge);
        values[5] = Float8GetDatum(result_tuples[funcctx->call_cntr].cost);
        values[6] = Float8GetDatum(result_tuples[funcctx->call_cntr].agg_cost);
 
        /**********************************************************************/
 
        tuple = heap_form_tuple(tuple_desc, values, nulls);
        result = HeapTupleGetDatum(tuple);
        SRF_RETURN_NEXT(funcctx, result);
    } else {
        /**********************************************************************/
 
        PGR_DBG("Clean up code");
 
        /**********************************************************************/
 
        SRF_RETURN_DONE(funcctx);
    }
}

References pgr_mst_rt::agg_cost, pgr_mst_rt::cost, pgr_mst_rt::depth, pgr_mst_rt::edge, pgr_mst_rt::from_v, if(), pgr_mst_rt::node, PGR_DBG, and process().

PG_FUNCTION_INFO_V1()

PG_FUNCTION_INFO_V1

(

_pgr_breadthfirstsearch

)

process()

static void process ( char *  edges_sql, ArrayType *  starts, int64_t  max_depth, bool  directed, pgr_mst_rt **  result_tuples, size_t *  result_count  )

static

Definition at line 48 of file breadthFirstSearch.c.

                          {
    pgr_SPI_connect();
 
    PGR_DBG("Initializing arrays");
 
    size_t size_start_vidsArr = 0;
    int64_t *start_vidsArr = (int64_t *)
        pgr_get_bigIntArray(&size_start_vidsArr, starts);
    PGR_DBG("start_vidsArr size %ld ", size_start_vidsArr);
 
 
    (*result_tuples) = NULL;
    (*result_count) = 0;
 
    PGR_DBG("Load data");
    pgr_edge_t *edges = NULL;
    size_t total_edges = 0;
 
    pgr_get_edges(edges_sql, &edges, &total_edges);
    PGR_DBG("Total %ld edges in query:", total_edges);
 
    if (total_edges == 0) {
        if (start_vidsArr)
            pfree(start_vidsArr);
        pgr_SPI_finish();
        return;
    }
 
    PGR_DBG("Starting processing");
    clock_t start_t = clock();
    char *log_msg = NULL;
    char *notice_msg = NULL;
    char *err_msg = NULL;
    do_pgr_breadthFirstSearch(
        edges,
        total_edges,
        start_vidsArr, size_start_vidsArr,
        max_depth,
        directed,
 
        result_tuples,
        result_count,
 
        &log_msg,
        &notice_msg,
        &err_msg);
 
    time_msg(" processing pgr_breadthFirstSearch", start_t, clock());
    PGR_DBG("Returning %ld tuples", *result_count);
 
    if (err_msg) {
        if (*result_tuples)
            pfree(*result_tuples);
    }
 
    pgr_global_report(log_msg, notice_msg, err_msg);
 
    if (edges)
        pfree(edges);
    if (log_msg)
        pfree(log_msg);
    if (notice_msg)
        pfree(notice_msg);
    if (err_msg)
        pfree(err_msg);
 
    if (start_vidsArr)
        pfree(start_vidsArr);
    pgr_SPI_finish();
}

References do_pgr_breadthFirstSearch(), PGR_DBG, pgr_get_bigIntArray(), pgr_get_edges(), pgr_global_report(), pgr_SPI_connect(), pgr_SPI_finish(), and time_msg().

Referenced by _pgr_breadthfirstsearch().