add classes, QueryNode, nodeIterator for QL
Merge branch 'QL_Component'
add test files
finish a part of create query tree
incomplete code to create and iterating execution of a query tree
update insert
add QL warnings
change insert
add algo iterators
add algo iterators
add algo iterators
Merge branch 'QL_Component' of https://github.com/daizhihui/tinyBase into QL_Component
some debugs
Merge branch 'master' of https://github.com/daizhihui/tinyBase
Merge branch 'master' into QL_Component
debug selection print head infos
prototype of trees and iterators
convertion of conditions
change architecture and interfaces
add internal.h