1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
|
/*
* Routines for handling of 'SET var TO', 'SHOW var' and 'RESET var'
* statements.
*
* $Id: variable.c,v 1.9 1997/05/20 10:31:42 vadim Exp $
*
*/
#include <stdio.h>
#include <string.h>
#include "postgres.h"
#include "miscadmin.h"
#include "tcop/variable.h"
#include "utils/builtins.h"
#include "optimizer/internal.h"
extern Cost _cpu_page_wight_;
extern Cost _cpu_index_page_wight_;
extern bool _use_geqo_;
extern bool _use_right_sided_plans_;
/*-----------------------------------------------------------------------*/
#if USE_EURODATES
#define DATE_EURO TRUE
#else
#define DATE_EURO FALSE
#endif
/*-----------------------------------------------------------------------*/
struct PGVariables PGVariables =
{
{ DATE_EURO, Date_Postgres }
};
/*-----------------------------------------------------------------------*/
static const char *get_token(char *buf, int size, const char *str)
{
if(!*str)
return NULL;
/* skip white space */
while(*str && (*str == ' ' || *str == '\t'))
str++;
/* copy until we hit white space or comma or end of string */
while(*str && *str != ' ' && *str != '\t' && *str != ',' && size-- > 1)
*buf++ = *str++;
*buf = '\0';
/* skip white space and comma*/
while(*str && (*str == ' ' || *str == '\t' || *str == ','))
str++;
return str;
}
/*-----------------------------------------------------------------------*/
static bool parse_null(const char *value)
{
return TRUE;
}
static bool show_null(const char *value)
{
return TRUE;
}
static bool reset_null(const char *value)
{
return TRUE;
}
static bool parse_geqo (const char *value)
{
if ( strcasecmp (value, "on") == 0 )
_use_geqo_ = true;
else if ( strcasecmp (value, "off") == 0 )
_use_geqo_ = false;
else
elog(WARN, "Bad value for GEQO (%s)", value);
return TRUE;
}
static bool show_geqo ()
{
if ( _use_geqo_ )
elog (NOTICE, "GEQO is ON");
else
elog (NOTICE, "GEQO is OFF");
return TRUE;
}
static bool reset_geqo ()
{
#ifdef GEQO
_use_geqo_ = true;
#else
_use_geqo_ = false;
#endif
return TRUE;
}
static bool parse_r_plans (const char *value)
{
if ( strcasecmp (value, "on") == 0 )
_use_right_sided_plans_ = true;
else if ( strcasecmp (value, "off") == 0 )
_use_right_sided_plans_ = false;
else
elog(WARN, "Bad value for Right-sided Plans (%s)", value);
return TRUE;
}
static bool show_r_plans ()
{
if ( _use_right_sided_plans_ )
elog (NOTICE, "Right-sided Plans are ON");
else
elog (NOTICE, "Right-sided Plans are OFF");
return TRUE;
}
static bool reset_r_plans ()
{
#ifdef USE_RIGHT_SIDED_PLANS
_use_right_sided_plans_ = true;
#else
_use_right_sided_plans_ = false;
#endif
return TRUE;
}
static bool parse_cost_heap (const char *value)
{
float32 res = float4in ((char*)value);
_cpu_page_wight_ = *res;
return TRUE;
}
static bool show_cost_heap ()
{
elog (NOTICE, "COST_HEAP is %f", _cpu_page_wight_);
return TRUE;
}
static bool reset_cost_heap ()
{
_cpu_page_wight_ = _CPU_PAGE_WEIGHT_;
return TRUE;
}
static bool parse_cost_index (const char *value)
{
float32 res = float4in ((char*)value);
_cpu_index_page_wight_ = *res;
return TRUE;
}
static bool show_cost_index ()
{
elog (NOTICE, "COST_INDEX is %f", _cpu_index_page_wight_);
return TRUE;
}
static bool reset_cost_index ()
{
_cpu_index_page_wight_ = _CPU_INDEX_PAGE_WEIGHT_;
return TRUE;
}
static bool parse_date(const char *value)
{
char tok[32];
int dcnt = 0, ecnt = 0;
while((value = get_token(tok, sizeof(tok), value)) != 0)
{
/* Ugh. Somebody ought to write a table driven version -- mjl */
if(!strcasecmp(tok, "iso"))
{
DateStyle = USE_ISO_DATES;
dcnt++;
}
else if(!strcasecmp(tok, "sql"))
{
DateStyle = USE_SQL_DATES;
dcnt++;
}
else if(!strcasecmp(tok, "postgres"))
{
DateStyle = USE_POSTGRES_DATES;
dcnt++;
}
else if(!strncasecmp(tok, "euro", 4))
{
EuroDates = TRUE;
ecnt++;
}
else if((!strcasecmp(tok, "us"))
|| (!strncasecmp(tok, "noneuro", 7)))
{
EuroDates = FALSE;
ecnt++;
}
else if(!strcasecmp(tok, "default"))
{
DateStyle = USE_POSTGRES_DATES;
EuroDates = FALSE;
ecnt++;
}
else
{
elog(WARN, "Bad value for date style (%s)", tok);
}
}
if(dcnt > 1 || ecnt > 1)
elog(NOTICE, "Conflicting settings for date");
return TRUE;
}
static bool show_date()
{
char buf[64];
strcpy( buf, "DateStyle is ");
switch (DateStyle) {
case USE_ISO_DATES:
strcat( buf, "ISO");
break;
case USE_SQL_DATES:
strcat( buf, "SQL");
break;
default:
strcat( buf, "Postgres");
break;
};
strcat( buf, " with ");
strcat( buf, ((EuroDates)? "European": "US (NonEuropean)"));
strcat( buf, " conventions");
elog(NOTICE, buf, NULL);
return TRUE;
}
static bool reset_date()
{
DateStyle = USE_POSTGRES_DATES;
EuroDates = FALSE;
return TRUE;
}
/*-----------------------------------------------------------------------*/
struct VariableParsers
{
const char *name;
bool (*parser)(const char *);
bool (*show)();
bool (*reset)();
} VariableParsers[] =
{
{ "datestyle", parse_date, show_date, reset_date },
{ "timezone", parse_null, show_null, reset_null },
{ "cost_heap", parse_cost_heap,
show_cost_heap, reset_cost_heap },
{ "cost_index", parse_cost_index,
show_cost_index, reset_cost_index },
{ "geqo", parse_geqo, show_geqo, reset_geqo },
{ "r_plans", parse_r_plans, show_r_plans, reset_r_plans },
{ NULL, NULL, NULL }
};
/*-----------------------------------------------------------------------*/
bool SetPGVariable(const char *name, const char *value)
{
struct VariableParsers *vp;
for(vp = VariableParsers; vp->name; vp++)
{
if(!strcasecmp(vp->name, name))
return (vp->parser)(value);
}
elog(NOTICE, "Unrecognized variable %s", name);
return TRUE;
}
/*-----------------------------------------------------------------------*/
bool GetPGVariable(const char *name)
{
struct VariableParsers *vp;
for(vp = VariableParsers; vp->name; vp++)
{
if(!strcasecmp(vp->name, name))
return (vp->show)();
}
elog(NOTICE, "Unrecognized variable %s", name);
return TRUE;
}
/*-----------------------------------------------------------------------*/
bool ResetPGVariable(const char *name)
{
struct VariableParsers *vp;
for(vp = VariableParsers; vp->name; vp++)
{
if(!strcasecmp(vp->name, name))
return (vp->reset)();
}
elog(NOTICE, "Unrecognized variable %s", name);
return TRUE;
}
|
