TRANS_INCHECKPOINT
tree->eTransState = TRANS_INCHECKPOINT;
if( tree->eTransState == TRANS_INCHECKPOINT ){
if( tree->eTransState != TRANS_INCHECKPOINT ) return SQLITE_OK;
assert( pRbtree->eTransState == TRANS_INCHECKPOINT ||
if( pRbtree->eTransState == TRANS_INCHECKPOINT ){