PostgreSQL Source Code git master
Functions
execJunk.c File Reference
#include "postgres.h"
#include "executor/executor.h"
Include dependency graph for execJunk.c:

Go to the source code of this file.

Functions

JunkFilter *  ExecInitJunkFilter (List *targetList, TupleTableSlot *slot)
 
JunkFilter *  ExecInitJunkFilterConversion (List *targetList, TupleDesc cleanTupType, TupleTableSlot *slot)
 
AttrNumber  ExecFindJunkAttribute (JunkFilter *junkfilter, const char *attrName)
 
AttrNumber  ExecFindJunkAttributeInTlist (List *targetlist, const char *attrName)
 
TupleTableSlot *  ExecFilterJunk (JunkFilter *junkfilter, TupleTableSlot *slot)
 

Function Documentation

◆ ExecFilterJunk()

TupleTableSlot * ExecFilterJunk ( JunkFilter *  junkfilter,
TupleTableSlot *  slot 
)

Definition at line 247 of file execJunk.c.

248{
249 TupleTableSlot *resultSlot;
250 AttrNumber *cleanMap;
251 TupleDesc cleanTupType;
252 int cleanLength;
253 int i;
254 Datum *values;
255 bool *isnull;
256 Datum *old_values;
257 bool *old_isnull;
258
259 /*
260 * Extract all the values of the old tuple.
261 */
262 slot_getallattrs(slot);
263 old_values = slot->tts_values;
264 old_isnull = slot->tts_isnull;
265
266 /*
267 * get info from the junk filter
268 */
269 cleanTupType = junkfilter->jf_cleanTupType;
270 cleanLength = cleanTupType->natts;
271 cleanMap = junkfilter->jf_cleanMap;
272 resultSlot = junkfilter->jf_resultSlot;
273
274 /*
275 * Prepare to build a virtual result tuple.
276 */
277 ExecClearTuple(resultSlot);
278 values = resultSlot->tts_values;
279 isnull = resultSlot->tts_isnull;
280
281 /*
282 * Transpose data into proper fields of the new tuple.
283 */
284 for (i = 0; i < cleanLength; i++)
285 {
286 int j = cleanMap[i];
287
288 if (j == 0)
289 {
290 values[i] = (Datum) 0;
291 isnull[i] = true;
292 }
293 else
294 {
295 values[i] = old_values[j - 1];
296 isnull[i] = old_isnull[j - 1];
297 }
298 }
299
300 /*
301 * And return the virtual tuple.
302 */
303 return ExecStoreVirtualTuple(resultSlot);
304}
int16 AttrNumber
Definition: attnum.h:21
static Datum values[MAXATTR]
Definition: bootstrap.c:153
TupleTableSlot * ExecStoreVirtualTuple(TupleTableSlot *slot)
Definition: execTuples.c:1741
j
int j
Definition: isn.c:78
i
int i
Definition: isn.c:77
uint64_t Datum
Definition: postgres.h:70
TupleDesc jf_cleanTupType
Definition: execnodes.h:419
TupleTableSlot * jf_resultSlot
Definition: execnodes.h:421
AttrNumber * jf_cleanMap
Definition: execnodes.h:420
int natts
Definition: tupdesc.h:137
bool * tts_isnull
Definition: tuptable.h:127
Datum * tts_values
Definition: tuptable.h:125
static TupleTableSlot * ExecClearTuple(TupleTableSlot *slot)
Definition: tuptable.h:458
static void slot_getallattrs(TupleTableSlot *slot)
Definition: tuptable.h:372

References ExecClearTuple(), ExecStoreVirtualTuple(), i, j, JunkFilter::jf_cleanMap, JunkFilter::jf_cleanTupType, JunkFilter::jf_resultSlot, TupleDescData::natts, slot_getallattrs(), TupleTableSlot::tts_isnull, TupleTableSlot::tts_values, and values.

Referenced by ExecEvalWholeRowVar(), ExecutePlan(), and sqlfunction_receive().

◆ ExecFindJunkAttribute()

AttrNumber ExecFindJunkAttribute ( JunkFilter *  junkfilter,
const char *  attrName 
)

Definition at line 210 of file execJunk.c.

211{
212 return ExecFindJunkAttributeInTlist(junkfilter->jf_targetList, attrName);
213}
AttrNumber ExecFindJunkAttributeInTlist(List *targetlist, const char *attrName)
Definition: execJunk.c:222
List * jf_targetList
Definition: execnodes.h:418

References ExecFindJunkAttributeInTlist(), and JunkFilter::jf_targetList.

◆ ExecFindJunkAttributeInTlist()

AttrNumber ExecFindJunkAttributeInTlist ( List *  targetlist,
const char *  attrName 
)

Definition at line 222 of file execJunk.c.

223{
224 ListCell *t;
225
226 foreach(t, targetlist)
227 {
228 TargetEntry *tle = lfirst(t);
229
230 if (tle->resjunk && tle->resname &&
231 (strcmp(tle->resname, attrName) == 0))
232 {
233 /* We found it ! */
234 return tle->resno;
235 }
236 }
237
238 return InvalidAttrNumber;
239}
#define InvalidAttrNumber
Definition: attnum.h:23
#define lfirst(lc)
Definition: pg_list.h:172
AttrNumber resno
Definition: primnodes.h:2240
Definition: pg_list.h:46

References InvalidAttrNumber, lfirst, and TargetEntry::resno.

Referenced by create_foreign_modify(), ExecBuildAuxRowMark(), ExecFindJunkAttribute(), and ExecInitModifyTable().

◆ ExecInitJunkFilter()

JunkFilter * ExecInitJunkFilter ( List *  targetList,
TupleTableSlot *  slot 
)

Definition at line 60 of file execJunk.c.

61{
62 JunkFilter *junkfilter;
63 TupleDesc cleanTupType;
64 int cleanLength;
65 AttrNumber *cleanMap;
66
67 /*
68 * Compute the tuple descriptor for the cleaned tuple.
69 */
70 cleanTupType = ExecCleanTypeFromTL(targetList);
71
72 /*
73 * Use the given slot, or make a new slot if we weren't given one.
74 */
75 if (slot)
76 ExecSetSlotDescriptor(slot, cleanTupType);
77 else
78 slot = MakeSingleTupleTableSlot(cleanTupType, &TTSOpsVirtual);
79
80 /*
81 * Now calculate the mapping between the original tuple's attributes and
82 * the "clean" tuple's attributes.
83 *
84 * The "map" is an array of "cleanLength" attribute numbers, i.e. one
85 * entry for every attribute of the "clean" tuple. The value of this entry
86 * is the attribute number of the corresponding attribute of the
87 * "original" tuple. (Zero indicates a NULL output attribute, but we do
88 * not use that feature in this routine.)
89 */
90 cleanLength = cleanTupType->natts;
91 if (cleanLength > 0)
92 {
93 AttrNumber cleanResno;
94 ListCell *t;
95
96 cleanMap = (AttrNumber *) palloc(cleanLength * sizeof(AttrNumber));
97 cleanResno = 0;
98 foreach(t, targetList)
99 {
100 TargetEntry *tle = lfirst(t);
101
102 if (!tle->resjunk)
103 {
104 cleanMap[cleanResno] = tle->resno;
105 cleanResno++;
106 }
107 }
108 Assert(cleanResno == cleanLength);
109 }
110 else
111 cleanMap = NULL;
112
113 /*
114 * Finally create and initialize the JunkFilter struct.
115 */
116 junkfilter = makeNode(JunkFilter);
117
118 junkfilter->jf_targetList = targetList;
119 junkfilter->jf_cleanTupType = cleanTupType;
120 junkfilter->jf_cleanMap = cleanMap;
121 junkfilter->jf_resultSlot = slot;
122
123 return junkfilter;
124}
TupleTableSlot * MakeSingleTupleTableSlot(TupleDesc tupdesc, const TupleTableSlotOps *tts_ops)
Definition: execTuples.c:1427
const TupleTableSlotOps TTSOpsVirtual
Definition: execTuples.c:84
TupleDesc ExecCleanTypeFromTL(List *targetList)
Definition: execTuples.c:2139
void ExecSetSlotDescriptor(TupleTableSlot *slot, TupleDesc tupdesc)
Definition: execTuples.c:1478
Assert(PointerIsAligned(start, uint64))
void * palloc(Size size)
Definition: mcxt.c:1365
#define makeNode(_type_)
Definition: nodes.h:161

References Assert(), ExecCleanTypeFromTL(), ExecSetSlotDescriptor(), JunkFilter::jf_cleanMap, JunkFilter::jf_cleanTupType, JunkFilter::jf_resultSlot, JunkFilter::jf_targetList, lfirst, makeNode, MakeSingleTupleTableSlot(), TupleDescData::natts, palloc(), TargetEntry::resno, and TTSOpsVirtual.

Referenced by ExecInitWholeRowVar(), init_execution_state(), and InitPlan().

◆ ExecInitJunkFilterConversion()

JunkFilter * ExecInitJunkFilterConversion ( List *  targetList,
TupleDesc  cleanTupType,
TupleTableSlot *  slot 
)

Definition at line 137 of file execJunk.c.

140{
141 JunkFilter *junkfilter;
142 int cleanLength;
143 AttrNumber *cleanMap;
144 ListCell *t;
145 int i;
146
147 /*
148 * Use the given slot, or make a new slot if we weren't given one.
149 */
150 if (slot)
151 ExecSetSlotDescriptor(slot, cleanTupType);
152 else
153 slot = MakeSingleTupleTableSlot(cleanTupType, &TTSOpsVirtual);
154
155 /*
156 * Calculate the mapping between the original tuple's attributes and the
157 * "clean" tuple's attributes.
158 *
159 * The "map" is an array of "cleanLength" attribute numbers, i.e. one
160 * entry for every attribute of the "clean" tuple. The value of this entry
161 * is the attribute number of the corresponding attribute of the
162 * "original" tuple. We store zero for any deleted attributes, marking
163 * that a NULL is needed in the output tuple.
164 */
165 cleanLength = cleanTupType->natts;
166 if (cleanLength > 0)
167 {
168 cleanMap = (AttrNumber *) palloc0(cleanLength * sizeof(AttrNumber));
169 t = list_head(targetList);
170 for (i = 0; i < cleanLength; i++)
171 {
172 if (TupleDescCompactAttr(cleanTupType, i)->attisdropped)
173 continue; /* map entry is already zero */
174 for (;;)
175 {
176 TargetEntry *tle = lfirst(t);
177
178 t = lnext(targetList, t);
179 if (!tle->resjunk)
180 {
181 cleanMap[i] = tle->resno;
182 break;
183 }
184 }
185 }
186 }
187 else
188 cleanMap = NULL;
189
190 /*
191 * Finally create and initialize the JunkFilter struct.
192 */
193 junkfilter = makeNode(JunkFilter);
194
195 junkfilter->jf_targetList = targetList;
196 junkfilter->jf_cleanTupType = cleanTupType;
197 junkfilter->jf_cleanMap = cleanMap;
198 junkfilter->jf_resultSlot = slot;
199
200 return junkfilter;
201}
void * palloc0(Size size)
Definition: mcxt.c:1395
static ListCell * list_head(const List *l)
Definition: pg_list.h:128
static ListCell * lnext(const List *l, const ListCell *c)
Definition: pg_list.h:343
static CompactAttribute * TupleDescCompactAttr(TupleDesc tupdesc, int i)
Definition: tupdesc.h:175

References ExecSetSlotDescriptor(), i, JunkFilter::jf_cleanMap, JunkFilter::jf_cleanTupType, JunkFilter::jf_resultSlot, JunkFilter::jf_targetList, lfirst, list_head(), lnext(), makeNode, MakeSingleTupleTableSlot(), TupleDescData::natts, palloc0(), TargetEntry::resno, TTSOpsVirtual, and TupleDescCompactAttr().

Referenced by init_execution_state().

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