private void EvaluateSingles(List <SqlBinaryExpression> list, List <ExpressionPlan> plans)
{
// The list of simple expression plans (lhs = single)
var simplePlanList = new List <SingleColumnPlan>();
// The list of complex function expression plans (lhs = expression)
var complexPlanList = new List <SingleColumnPlan>();
foreach (var expression in list)
{
// The single var
ObjectName singleVar;
SqlExpressionType op = expression.ExpressionType;
SqlExpression left = expression.Left, right = expression.Right;
if (expression.Right is SqlQuantifiedExpression)
{
singleVar = expression.Left.AsReferenceName();
if (singleVar != null)
{
plans.Add(new SimpleSelectPlan(this, singleVar, op, expression.Right));
}
else
{
singleVar = expression.Left.DiscoverReferences().First();
plans.Add(new ComplexSinglePlan(this, singleVar, expression));
}
}
else
{
singleVar = expression.Left.DiscoverReferences().FirstOrDefault();
if (singleVar == null)
{
// Reverse the expressions and the operator
var tempExp = left;
left = right;
right = tempExp;
op = op.Reverse();
singleVar = left.DiscoverReferences().First();
}
var tableSource = FindPlan(singleVar);
// Simple LHS?
var v = left.AsReferenceName();
if (v != null)
{
AddSingleColumnPlan(simplePlanList, tableSource, v, singleVar, new [] { left, right }, op);
}
else
{
// No, complex lhs
AddSingleColumnPlan(complexPlanList, tableSource, null, singleVar, new [] { left, right }, op);
}
}
}
plans.AddRange(simplePlanList.Select(plan => new SimpleSinglePlan(this, plan.UniqueName, plan.Expression)).Cast <ExpressionPlan>());
plans.AddRange(complexPlanList.Select(plan => new ComplexSinglePlan(this, plan.UniqueName, plan.Expression)).Cast <ExpressionPlan>());
}
public static Field EvaluateAll(SqlExpressionType plainType, Field ob1, Field ob2,
EvaluateContext context)
{
if (ob2.Type is QueryType) {
// The sub-query plan
var planObj = (SqlQueryObject) ob2.Value;
// Discover the correlated variables for this plan.
var list = planObj.QueryPlan.DiscoverQueryReferences(1);
if (list.Count > 0) {
// Set the correlated variables from the IVariableResolver
foreach (var variable in list) {
variable.Evaluate(context.VariableResolver, context.Request);
}
// Clear the cache in the context
context.Request.Access().ClearCachedTables();
}
// Evaluate the plan,
var t = planObj.QueryPlan.Evaluate(context.Request);
var revPlainOp = plainType.Reverse();
return Field.Boolean(t.AllRowsMatchColumnValue(0, revPlainOp, ob1));
}
if (ob2.Type is ArrayType) {
var expList = (SqlArray) ob2.Value;
// Assume true unless otherwise found to be false or NULL.
Field retVal = Field.BooleanTrue;
foreach (var exp in expList) {
var expItem = exp.Evaluate(context);
if (expItem.ExpressionType != SqlExpressionType.Constant)
throw new InvalidOperationException();
var evalItem = (SqlConstantExpression)expItem;
// If there is a null item, we return null if not otherwise found to
// be false.
if (evalItem.Value.IsNull) {
retVal = Field.BooleanNull;
} else if (!IsTrue(Evaluate(ob1, plainType, evalItem.Value, context/*, true, false*/))) {
// If it doesn't match return false
return Field.BooleanFalse;
}
}
// Otherwise return true or null. If all match and no NULLs return
// true. If all match and there are NULLs then return NULL.
return retVal;
}
throw new InvalidOperationException("Unknown RHS of ALL.");
}
public static Field EvaluateAny(SqlExpressionType plainType, Field ob1, Field ob2, EvaluateContext context)
{
if (ob2.Type is QueryType) {
// The sub-query plan
var plan = ((SqlQueryObject)ob2.Value).QueryPlan;
// Discover the correlated variables for this plan.
var list = plan.DiscoverQueryReferences(1);
if (list.Count > 0) {
// Set the correlated variables from the IVariableResolver
foreach (var variable in list) {
variable.Evaluate(context.VariableResolver, context.Request);
}
// Clear the cache in the context
context.Request.Access().ClearCachedTables();
}
// Evaluate the plan,
var t = plan.Evaluate(context.Request);
// The ANY operation
var revPlainOp = plainType.Reverse();
return Field.Boolean(t.AnyRowMatchesColumnValue(0, revPlainOp, ob1));
}
if (ob2.Type is ArrayType) {
var expList = (SqlArray)ob2.Value;
// Assume there are no matches
var retVal = Field.BooleanFalse;
foreach (var exp in expList) {
var expItem = exp.Evaluate(context);
if (expItem.ExpressionType != SqlExpressionType.Constant)
throw new InvalidOperationException();
var evalItem = (SqlConstantExpression) expItem;
// If null value, return null if there isn't otherwise a match found.
if (evalItem.Value.IsNull) {
retVal = Field.BooleanNull;
} else if (IsTrue(Evaluate(ob1, plainType, evalItem.Value, context/*, false, true*/))) {
// If there is a match, the ANY set test is true
return Field.BooleanTrue;
}
}
// No matches, so return either false or NULL. If there are no matches
// and no nulls, return false. If there are no matches and there are
// nulls present, return null.
return retVal;
}
throw new InvalidOperationException("Unknown RHS of ANY.");
}
public static Field EvaluateAll(SqlExpressionType plainType, Field ob1, Field ob2,
EvaluateContext context)
{
if (ob2.Type is QueryType)
{
// The sub-query plan
var planObj = (SqlQueryObject)ob2.Value;
// Discover the correlated variables for this plan.
var list = planObj.QueryPlan.DiscoverQueryReferences(1);
if (list.Count > 0)
{
// Set the correlated variables from the IVariableResolver
foreach (var variable in list)
{
variable.Evaluate(context.VariableResolver, context.Request);
}
// Clear the cache in the context
context.Request.Access().ClearCachedTables();
}
// Evaluate the plan,
var t = planObj.QueryPlan.Evaluate(context.Request);
var revPlainOp = plainType.Reverse();
return(Field.Boolean(t.AllRowsMatchColumnValue(0, revPlainOp, ob1)));
}
if (ob2.Type is ArrayType)
{
var expList = (SqlArray)ob2.Value;
// Assume true unless otherwise found to be false or NULL.
Field retVal = Field.BooleanTrue;
foreach (var exp in expList)
{
var expItem = exp.Evaluate(context);
if (expItem.ExpressionType != SqlExpressionType.Constant)
{
throw new InvalidOperationException();
}
var evalItem = (SqlConstantExpression)expItem;
// If there is a null item, we return null if not otherwise found to
// be false.
if (evalItem.Value.IsNull)
{
retVal = Field.BooleanNull;
}
else if (!IsTrue(Evaluate(ob1, plainType, evalItem.Value, context /*, true, false*/)))
{
// If it doesn't match return false
return(Field.BooleanFalse);
}
}
// Otherwise return true or null. If all match and no NULLs return
// true. If all match and there are NULLs then return NULL.
return(retVal);
}
throw new InvalidOperationException("Unknown RHS of ALL.");
}
public static Field EvaluateAny(SqlExpressionType plainType, Field ob1, Field ob2, EvaluateContext context)
{
if (ob2.Type is QueryType)
{
// The sub-query plan
var plan = ((SqlQueryObject)ob2.Value).QueryPlan;
// Discover the correlated variables for this plan.
var list = plan.DiscoverQueryReferences(1);
if (list.Count > 0)
{
// Set the correlated variables from the IVariableResolver
foreach (var variable in list)
{
variable.Evaluate(context.VariableResolver, context.Request);
}
// Clear the cache in the context
context.Request.Access().ClearCachedTables();
}
// Evaluate the plan,
var t = plan.Evaluate(context.Request);
// The ANY operation
var revPlainOp = plainType.Reverse();
return(Field.Boolean(t.AnyRowMatchesColumnValue(0, revPlainOp, ob1)));
}
if (ob2.Type is ArrayType)
{
var expList = (SqlArray)ob2.Value;
// Assume there are no matches
var retVal = Field.BooleanFalse;
foreach (var exp in expList)
{
var expItem = exp.Evaluate(context);
if (expItem.ExpressionType != SqlExpressionType.Constant)
{
throw new InvalidOperationException();
}
var evalItem = (SqlConstantExpression)expItem;
// If null value, return null if there isn't otherwise a match found.
if (evalItem.Value.IsNull)
{
retVal = Field.BooleanNull;
}
else if (IsTrue(Evaluate(ob1, plainType, evalItem.Value, context /*, false, true*/)))
{
// If there is a match, the ANY set test is true
return(Field.BooleanTrue);
}
}
// No matches, so return either false or NULL. If there are no matches
// and no nulls, return false. If there are no matches and there are
// nulls present, return null.
return(retVal);
}
throw new InvalidOperationException("Unknown RHS of ANY.");
}