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more TDB

This commit is contained in:
Hongze Cheng 2022-03-08 01:37:32 +00:00
parent cd103b8a50
commit dcdc577b12
1 changed files with 37 additions and 4 deletions
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41
source/libs/tdb/src/db/tdbBtree.c
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@ -446,17 +446,28 @@ static int tdbBtreeBalanceDeeper(SBTree *pBt, SPage *pRoot, SPage **ppChild) {
return -1;
}
*ppChild = pChild;
return 0;
}
static int tdbBtreeBalanceNonRoot(SBTree *pBt, SPage *pParent, bool isRoot) {
#if 0
int i;
i = pParent->pPageHdr->nCells + pParent->nOverFlow;
#endif
/* TODO */
return 0;
}
static int tdbBtreeBalance(SBtCursor *pCur) {
int iPage;
SPage *pPage;
SPage *pParent;
int ret;
// Main loop to balance the BTree
for (;;) {
iPage = pCur->iPage;
pPage = pCur->pPage;
// TODO: Get the page free space if not get yet
// if (pPage->nFree < 0) {
@ -470,10 +481,32 @@ static int tdbBtreeBalance(SBtCursor *pCur) {
}
if (iPage == 0) {
// Balance the root page
ASSERT(TDB_BTREE_PAGE_IS_ROOT(pPage->pPageHdr->flags));
// Balance the root page by copy the root page content to
// a child page and set the root page as empty first
ASSERT(TDB_BTREE_PAGE_IS_ROOT(pCur->pPage->pPageHdr->flags));
ret = tdbBtreeBalanceDeeper(pCur->pBt, pCur->pPage, &(pCur->pgStack[1]));
if (ret < 0) {
return -1;
}
pCur->idx = 0;
pCur->idxStack[0] = 0;
pCur->pgStack[0] = pCur->pPage;
pCur->iPage = 1;
pCur->pPage = pCur->pgStack[1];
} else {
// Generalized balance step
pParent = pCur->pgStack[pCur->iPage - 1];
ret = tdbBtreeBalanceNonRoot(pCur->pBt, pParent, (iPage == 1));
if (ret < 0) {
return -1;
}
pCur->iPage--;
pCur->pPage = pCur->pgStack[pCur->iPage];
}
}