diff options
Diffstat (limited to 'src/backend/executor/nodeIndexscan.c')
| -rw-r--r-- | src/backend/executor/nodeIndexscan.c | 81 |
1 files changed, 41 insertions, 40 deletions
diff --git a/src/backend/executor/nodeIndexscan.c b/src/backend/executor/nodeIndexscan.c index a55d9cc6e1c..461bc1b8a5e 100644 --- a/src/backend/executor/nodeIndexscan.c +++ b/src/backend/executor/nodeIndexscan.c @@ -7,7 +7,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/executor/nodeIndexscan.c,v 1.35 1999/05/10 00:45:06 momjian Exp $ + * $Header: /cvsroot/pgsql/src/backend/executor/nodeIndexscan.c,v 1.36 1999/05/25 16:08:43 momjian Exp $ * *------------------------------------------------------------------------- */ @@ -91,13 +91,14 @@ IndexNext(IndexScan *node) IndexScanDesc scandesc; Relation heapRelation; RetrieveIndexResult result; - HeapTuple tuple; + HeapTuple tuple; TupleTableSlot *slot; Buffer buffer = InvalidBuffer; int numIndices; - bool bBackward; - int indexNumber; + bool bBackward; + int indexNumber; + /* ---------------- * extract necessary information from index scan node * ---------------- @@ -114,14 +115,14 @@ IndexNext(IndexScan *node) /* * Check if we are evaluating PlanQual for tuple of this relation. - * Additional checking is not good, but no other way for now. - * We could introduce new nodes for this case and handle - * IndexScan --> NewNode switching in Init/ReScan plan... + * Additional checking is not good, but no other way for now. We could + * introduce new nodes for this case and handle IndexScan --> NewNode + * switching in Init/ReScan plan... */ - if (estate->es_evTuple != NULL && + if (estate->es_evTuple != NULL && estate->es_evTuple[node->scan.scanrelid - 1] != NULL) { - int iptr; + int iptr; slot->ttc_buffer = InvalidBuffer; slot->ttc_shouldFree = false; @@ -138,7 +139,7 @@ IndexNext(IndexScan *node) scanstate->cstate.cs_ExprContext)) break; } - if (iptr == numIndices) /* would not be returned by indices */ + if (iptr == numIndices) /* would not be returned by indices */ slot->val = NULL; /* Flag for the next call that no more tuples */ estate->es_evTupleNull[node->scan.scanrelid - 1] = true; @@ -153,26 +154,26 @@ IndexNext(IndexScan *node) * appropriate heap tuple.. else return NULL. * ---------------- */ - bBackward = ScanDirectionIsBackward(direction); - if (bBackward) - { - indexNumber = numIndices - indexstate->iss_IndexPtr - 1; - if (indexNumber < 0) - { - indexNumber = 0; - indexstate->iss_IndexPtr = numIndices - 1; - } - } - else - { - if ((indexNumber = indexstate->iss_IndexPtr) < 0) - { - indexNumber = 0; - indexstate->iss_IndexPtr = 0; - } - } - while (indexNumber < numIndices) - { + bBackward = ScanDirectionIsBackward(direction); + if (bBackward) + { + indexNumber = numIndices - indexstate->iss_IndexPtr - 1; + if (indexNumber < 0) + { + indexNumber = 0; + indexstate->iss_IndexPtr = numIndices - 1; + } + } + else + { + if ((indexNumber = indexstate->iss_IndexPtr) < 0) + { + indexNumber = 0; + indexstate->iss_IndexPtr = 0; + } + } + while (indexNumber < numIndices) + { scandesc = scanDescs[indexstate->iss_IndexPtr]; while ((result = index_getnext(scandesc, direction)) != NULL) { @@ -224,14 +225,14 @@ IndexNext(IndexScan *node) if (BufferIsValid(buffer)) ReleaseBuffer(buffer); } - if (indexNumber < numIndices) - { - indexNumber++; - if (bBackward) - indexstate->iss_IndexPtr--; - else - indexstate->iss_IndexPtr++; - } + if (indexNumber < numIndices) + { + indexNumber++; + if (bBackward) + indexstate->iss_IndexPtr--; + else + indexstate->iss_IndexPtr++; + } } /* ---------------- * if we get here it means the index scan failed so we @@ -323,7 +324,7 @@ ExecIndexReScan(IndexScan *node, ExprContext *exprCtxt, Plan *parent) indexstate->iss_IndexPtr = -1; /* If this is re-scanning of PlanQual ... */ - if (estate->es_evTuple != NULL && + if (estate->es_evTuple != NULL && estate->es_evTuple[node->scan.scanrelid - 1] != NULL) { estate->es_evTupleNull[node->scan.scanrelid - 1] = false; @@ -703,7 +704,7 @@ ExecInitIndexScan(IndexScan *node, EState *estate, Plan *parent) run_keys = (n_keys <= 0) ? NULL : (int *) palloc(n_keys * sizeof(int)); - CXT1_printf("ExecInitIndexScan: context is %d\n",CurrentMemoryContext); + CXT1_printf("ExecInitIndexScan: context is %d\n", CurrentMemoryContext); /* ---------------- * for each opclause in the given qual, |