/*
* @@ selectivity for tsvector var vs tsquery constant
*/
static Selectivity
tsquerysel(VariableStatData *vardata, Datum constval)
{
Selectivity selec;
TSQuery query;
/* The caller made sure the const is a TSQuery, so get it now */
query = DatumGetTSQuery(constval);
/* Empty query matches nothing */
if (query->size == 0)
return (Selectivity) 0.0;
if (HeapTupleIsValid(vardata->statsTuple))
{
Form_pg_statistic stats;
Datum *values;
int nvalues;
float4 *numbers;
int nnumbers;
stats = (Form_pg_statistic) GETSTRUCT(vardata->statsTuple);
/* MCELEM will be an array of TEXT elements for a tsvector column */
if (get_attstatsslot(vardata->statsTuple,
TEXTOID, -1,
STATISTIC_KIND_MCELEM, InvalidOid,
NULL,
&values, &nvalues,
&numbers, &nnumbers))
{
/*
* There is a most-common-elements slot for the tsvector Var, so
* use that.
*/
selec = mcelem_tsquery_selec(query, values, nvalues,
numbers, nnumbers);
free_attstatsslot(TEXTOID, values, nvalues, numbers, nnumbers);
}
else
{
/* No most-common-elements info, so do without */
selec = tsquery_opr_selec_no_stats(query);
}
/*
* MCE stats count only non-null rows, so adjust for null rows.
*/
selec *= (1.0 - stats->stanullfrac);
}
else
{
/* No stats at all, so do without */
selec = tsquery_opr_selec_no_stats(query);
/* we assume no nulls here, so no stanullfrac correction */
}
return selec;
}
/*
* @@ selectivity for tsvector var vs tsquery constant
*/
static Selectivity
tsquerysel(VariableStatData *vardata, Datum constval)
{
Selectivity selec;
TSQuery query;
/* The caller made sure the const is a TSQuery, so get it now */
query = DatumGetTSQuery(constval);
/* Empty query matches nothing */
if (query->size == 0)
return (Selectivity) 0.0;
if (HeapTupleIsValid(vardata->statsTuple))
{
Form_pg_statistic stats;
Datum *values;
int nvalues;
float4 *numbers;
int nnumbers;
stats = (Form_pg_statistic) GETSTRUCT(vardata->statsTuple);
/* MCELEM will be an array of TEXT elements for a tsvector column */
if (get_attstatsslot(vardata->statsTuple,
TEXTOID, -1,
STATISTIC_KIND_MCELEM, InvalidOid,
&values, &nvalues,
&numbers, &nnumbers))
{
/*
* There is a most-common-elements slot for the tsvector Var, so
* use that.
*/
selec = mcelem_tsquery_selec(query, values, nvalues,
numbers, nnumbers);
free_attstatsslot(TEXTOID, values, nvalues, numbers, nnumbers);
}
else
{
/* No most-common-elements info, so we must punt */
selec = (Selectivity) DEFAULT_TS_MATCH_SEL;
}
}
else
{
/* No stats at all, so we must punt */
selec = (Selectivity) DEFAULT_TS_MATCH_SEL;
}
return selec;
}
