database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-09-03 20:43:11 +03:00
Code Activity

ndb: wl-1893: range scanning backwards, ndb kernel

Browse Source
This commit is contained in:
pekka@mysql.com
2004-12-17 10:20:18 +01:00
parent 4ef4272e2c
commit b2f164b4b4
19 changed files with 272 additions and 66 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
ndb/src/ndbapi/NdbScanOperation.cpp
View File

@@ -116,7 +116,7 @@ NdbScanOperation::readTuples(NdbScanOperation::LockMode lm,
Uint32 batch,
Uint32 parallel)
{
m_ordered = 0;
m_ordered = m_descending = false;
Uint32 fragCount = m_currentTable->m_fragmentCount;
if (parallel > fragCount || parallel == 0) {
@@ -1191,9 +1191,10 @@ NdbIndexScanOperation::readTuples(LockMode lm,
Uint32 batch,
Uint32 parallel,
bool order_by,
bool order_desc,
bool read_range_no){
int res = NdbScanOperation::readTuples(lm, batch, 0);
if(read_range_no)
if(!res && read_range_no)
{
m_read_range_no = 1;
Uint32 word = 0;
@@ -1202,7 +1203,12 @@ NdbIndexScanOperation::readTuples(LockMode lm,
res = -1;
}
if(!res && order_by){
m_ordered = 1;
m_ordered = true;
if (order_desc) {
m_descending = true;
ScanTabReq * req = CAST_PTR(ScanTabReq, theSCAN_TABREQ->getDataPtrSend());
ScanTabReq::setDescendingFlag(req->requestInfo, true);
}
Uint32 cnt = m_accessTable->getNoOfColumns() - 1;
m_sort_columns = cnt; // -1 for NDB$NODE
m_current_api_receiver = m_sent_receivers_count;
@@ -1266,12 +1272,14 @@ NdbIndexScanOperation::compare(Uint32 skip, Uint32 cols,
r1 = (skip ? r1->next() : r1);
r2 = (skip ? r2->next() : r2);
const int jdir = 1 - 2 * (int)m_descending;
assert(jdir == 1 || jdir == -1);
while(cols > 0){
Uint32 * d1 = (Uint32*)r1->aRef();
Uint32 * d2 = (Uint32*)r2->aRef();
unsigned r1_null = r1->isNULL();
if((r1_null ^ (unsigned)r2->isNULL())){
return (r1_null ? -1 : 1);
return (r1_null ? -1 : 1) * jdir;
}
const NdbColumnImpl & col = NdbColumnImpl::getImpl(* r1->m_column);
Uint32 len = r1->theAttrSize * r1->theArraySize;
@@ -1280,7 +1288,7 @@ NdbIndexScanOperation::compare(Uint32 skip, Uint32 cols,
int r = (*sqlType.m_cmp)(col.m_cs, d1, len, d2, len, true);
if(r){
assert(r != NdbSqlUtil::CmpUnknown);
return r;
return r * jdir;
}
}
cols--;