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The cstring datatype can now be copied, passed around, etc. The typlen

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value '-2' is used to indicate a variable-width type whose width is
computed as strlen(datum)+1.  Everything that looks at typlen is updated
except for array support, which Joe Conway is working on; at the moment
it wouldn't work to try to create an array of cstring.
This commit is contained in:
Tom Lane
2002-08-24 15:00:47 +00:00
parent cf4d885c67
commit 976246cc7e
23 changed files with 260 additions and 198 deletions
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24
src/backend/commands/analyze.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/analyze.c,v 1.42 2002/08/11 00:08:48 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/analyze.c,v 1.43 2002/08/24 15:00:46 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -860,6 +860,8 @@ compute_minimal_stats(VacAttrStats *stats,
double total_width = 0;
bool is_varlena = (!stats->attr->attbyval &&
stats->attr->attlen == -1);
bool is_varwidth = (!stats->attr->attbyval &&
stats->attr->attlen < 0);
FmgrInfo f_cmpeq;
typedef struct
{
@ -905,7 +907,7 @@ compute_minimal_stats(VacAttrStats *stats,
nonnull_cnt++;
/*
* If it's a varlena field, add up widths for average width
* If it's a variable-width field, add up widths for average width
* calculation. Note that if the value is toasted, we use the
* toasted width. We don't bother with this calculation if it's a
* fixed-width type.
@ -928,6 +930,11 @@ compute_minimal_stats(VacAttrStats *stats,
}
value = PointerGetDatum(PG_DETOAST_DATUM(value));
}
else if (is_varwidth)
{
/* must be cstring */
total_width += strlen(DatumGetCString(value)) + 1;
}
/*
* See if the value matches anything we're already tracking.
@ -984,7 +991,7 @@ compute_minimal_stats(VacAttrStats *stats,
stats->stats_valid = true;
/* Do the simple null-frac and width stats */
stats->stanullfrac = (double) null_cnt / (double) numrows;
if (is_varlena)
if (is_varwidth)
stats->stawidth = total_width / (double) nonnull_cnt;
else
stats->stawidth = stats->attrtype->typlen;
@ -1157,6 +1164,8 @@ compute_scalar_stats(VacAttrStats *stats,
double total_width = 0;
bool is_varlena = (!stats->attr->attbyval &&
stats->attr->attlen == -1);
bool is_varwidth = (!stats->attr->attbyval &&
stats->attr->attlen < 0);
double corr_xysum;
RegProcedure cmpFn;
SortFunctionKind cmpFnKind;
@ -1196,7 +1205,7 @@ compute_scalar_stats(VacAttrStats *stats,
nonnull_cnt++;
/*
* If it's a varlena field, add up widths for average width
* If it's a variable-width field, add up widths for average width
* calculation. Note that if the value is toasted, we use the
* toasted width. We don't bother with this calculation if it's a
* fixed-width type.
@ -1219,6 +1228,11 @@ compute_scalar_stats(VacAttrStats *stats,
}
value = PointerGetDatum(PG_DETOAST_DATUM(value));
}
else if (is_varwidth)
{
/* must be cstring */
total_width += strlen(DatumGetCString(value)) + 1;
}
/* Add it to the list to be sorted */
values[values_cnt].value = value;
@ -1311,7 +1325,7 @@ compute_scalar_stats(VacAttrStats *stats,
stats->stats_valid = true;
/* Do the simple null-frac and width stats */
stats->stanullfrac = (double) null_cnt / (double) numrows;
if (is_varlena)
if (is_varwidth)
stats->stawidth = total_width / (double) nonnull_cnt;
else
stats->stawidth = stats->attrtype->typlen;