func (v *RuntimeVisitor) VisitSelect(n *parser.NodeSelect) error {
if builder.isProxyTable(n.Tables[0]) {
proxyTableName := n.Tables[0]
// refactor tree
proxy := builder.proxyTables[proxyTableName]
if !n.WildCard {
err := testAllFieldsFromTable(n.Fields, proxyTableName)
if err != nil {
return err
}
} else {
n.Fields = builder.possibleTables[proxyTableName]
n.WildCard = false
}
n.Tables[0] = proxy.table
var from, to string
for from, to = range proxy.fields {
break
}
oldWhere := n.Where
where := new(parser.NodeAnd)
condition := new(parser.NodeEqual)
conditionL := new(parser.NodeId)
conditionL.SetValue(from)
conditionR := new(parser.NodeLiteral)
conditionR.SetValue(to)
condition.SetLeftValue(conditionL)
condition.SetRightValue(conditionR)
where.SetLeftValue(condition)
where.SetRightValue(oldWhere)
n.Where = where
}
table := n.Tables[0]
var err error
err = builder.WithTable(table, table)
if err != nil {
return err
}
return testAllFieldsFromTable(n.Fields, table)
// Why not visit expression right now ?
// Because we will, at first, discover the current object
}
func (v *RuntimeVisitor) VisitEqual(n *parser.NodeEqual) error {
lvalue := n.LeftValue().(*parser.NodeId).Value()
rvalue := n.RightValue().(*parser.NodeLiteral).Value()
boolRegister = n.Assertion(metadata(lvalue), rvalue)
return nil
}