public UngroupedAndUnaggregatedColumnFinder(ExpressionNode[] groupByExpressions)
{
_groupByExpressions = groupByExpressions;
// Special handling for the case the user entered something like this:
//
// SELECT *
// FROM Employees e
// GROUP BY e
//
// In this case, all columns from e are implicitly grouped.
if (_groupByExpressions == null)
{
_groupedTableRefs = new TableRefBinding[0];
}
else
{
List<TableRefBinding> groupedTableRefList = new List<TableRefBinding>();
foreach (ExpressionNode groupByExpression in _groupByExpressions)
{
ColumnExpression exprAsColumn = groupByExpression as ColumnExpression;
if (exprAsColumn != null && exprAsColumn.Column.ColumnBinding is RowColumnBinding)
{
TableRefBinding groupedTableRef = exprAsColumn.Column.TableRefBinding;
if (!groupedTableRefList.Contains(groupedTableRef))
groupedTableRefList.Add(groupedTableRef);
}
}
_groupedTableRefs = groupedTableRefList.ToArray();
}
}
public FunctionInvocationExpression(Identifier identifier, ExpressionNode[] arguments, bool hasStarModifier)
: this()
{
_name = identifier;
_arguments = arguments;
_hasAsteriskModifier = hasStarModifier;
}
public CastExpression(ExpressionNode expression, Type targetType)
{
_expression = expression;
_typeReference = new TypeReference();
_typeReference.TypeName = targetType.AssemblyQualifiedName;
_typeReference.ResolvedType = targetType;
}
private static AlgebraNode WrapWithFilter(AlgebraNode input, ExpressionNode predicate)
{
if (predicate == null)
return input;
FilterAlgebraNode filterAlgebraNode = new FilterAlgebraNode();
filterAlgebraNode.Input = input;
filterAlgebraNode.Predicate = predicate;
return filterAlgebraNode;
}
private static bool AndPartHasOuterReference(ExpressionNode andPart, RowBufferEntry[] definedValues)
{
RowBufferEntry[] rowBufferEntries = AstUtil.GetRowBufferEntryReferences(andPart);
foreach (RowBufferEntry rowBufferEntry in rowBufferEntries)
{
if (!ArrayHelpers.Contains(definedValues, rowBufferEntry))
return true;
}
return false;
}
public static int FindStructuralEquivalentExpression(ExpressionNode[] expressions, ExpressionNode expr)
{
for (int i = 0; i < expressions.Length; i++)
{
ExpressionNode node = expressions[i];
if (node.IsStructuralEqualTo(expr))
return i;
}
return -1;
}
private static bool NeedParentheses(ExpressionNode childExpression, int parentPrecedence, bool isRightOperand)
{
// If childExpression is also an operator expression we may need parentheses.
//
// This depends on the precedence and associativity of the child operator.
// Since we have unary, binary and ternary operators we extract theses pieces
// of information using casts.
int childPrecedence;
bool isRightAssociative;
OperatorExpression expressionOperatorExpression = childExpression as OperatorExpression;
if (expressionOperatorExpression != null)
{
// It is a binary or unary operator.
childPrecedence = expressionOperatorExpression.Op.Precedence;
isRightAssociative = expressionOperatorExpression.Op.IsRightAssociative;
}
else
{
// Special handling for the only ternary operator.
BetweenExpression expressionAsBetweenExpression = childExpression as BetweenExpression;
if (expressionAsBetweenExpression != null)
{
childPrecedence = Operator.BETWEEN_PRECEDENCE;
isRightAssociative = false;
}
else
{
return false;
}
}
// Analyze precedences.
if (childPrecedence < parentPrecedence)
return true;
if (childPrecedence == parentPrecedence)
{
if (isRightOperand && !isRightAssociative)
return true;
if (!isRightOperand && isRightAssociative)
return true;
}
return false;
}
private static bool SemiJoinDoesNotDependOn(JoinAlgebraNode.JoinOperator op, ExpressionNode part, RowBufferEntry[] leftDefinedValues, RowBufferEntry[] rightDefinedValues)
{
if (op == JoinAlgebraNode.JoinOperator.LeftSemiJoin ||
op == JoinAlgebraNode.JoinOperator.LeftAntiSemiJoin)
{
return AstUtil.ExpressionDoesNotReference(part, rightDefinedValues);
}
if (op == JoinAlgebraNode.JoinOperator.RightSemiJoin ||
op == JoinAlgebraNode.JoinOperator.RightAntiSemiJoin)
{
return AstUtil.ExpressionDoesNotReference(part, leftDefinedValues);
}
return true;
}
public static RuntimeExpression CreateCompiled(ExpressionNode expressionNode)
{
string expressionSource = expressionNode.GenerateSource();
ILEmitContext ilEmitContext = new ILEmitContext(expressionSource);
ILParameterRegisterer ilParameterRegisterer = new ILParameterRegisterer(ilEmitContext);
ilParameterRegisterer.Visit(expressionNode);
ILTranslator ilTranslator = new ILTranslator(ilEmitContext);
ilTranslator.Visit(expressionNode);
CompiledExpressionDelegate compiledExpressionDelegate = ilEmitContext.CreateDelegate();
object[] arguments = ilEmitContext.GetArguments();
return new CompiledRuntimeExpression(expressionSource, expressionNode.ExpressionType, compiledExpressionDelegate, arguments);
}
public UnaryExpression(UnaryOperator op, ExpressionNode operand)
{
_op = op;
_operand = operand;
}
void IErrorReporter.AggregateContainsColumnsFromDifferentQueries(ExpressionNode aggregateArgument)
{
string message = String.Format(CultureInfo.CurrentCulture, Resources.AggregateContainsColumnsFromDifferentQueries, aggregateArgument.GenerateSource());
HandleError(ErrorId.AggregateContainsColumnsFromDifferentQueries, message);
}
public OrderByColumn(ExpressionNode expression, SortOrder sortOrder)
: this()
{
_expression = expression;
_sortOrder = sortOrder;
}
private ExpressionNode ResolveExpression(ExpressionNode expressionBeforeDot)
{
ExpressionNode resolvedExpression = _normalizer.VisitExpression(expressionBeforeDot);
return _resolver.VisitExpression(resolvedExpression);
}
private ExpressionNode ParsePrimaryExpression()
{
switch (_token.Id)
{
case TokenId.NULL:
NextToken();
return LiteralExpression.FromNull();
case TokenId.TRUE:
case TokenId.FALSE:
return ParseBooleanLiteral();
case TokenId.Date:
return ParseDateLiteral();
case TokenId.Number:
return ParseNumberLiteral();
case TokenId.String:
return LiteralExpression.FromString(ParseString());
case TokenId.EXISTS:
{
ExistsSubselect result = new ExistsSubselect();
NextToken();
Match(TokenId.LeftParentheses);
result.Query = ParseQuery();
Match(TokenId.RightParentheses);
return result;
}
case TokenId.ParameterMarker:
{
_rangeRecorder.Begin();
NextToken();
Identifier name = ParseIdentifier();
SourceRange nameSourceRange = _rangeRecorder.End();
ParameterExpression result = new ParameterExpression();
result.Name = name;
result.NameSourceRange = nameSourceRange;
return result;
}
case TokenId.CAST:
{
NextToken();
CastExpression castExpression = new CastExpression();
Match(TokenId.LeftParentheses);
castExpression.Expression = ParseExpression();
Match(TokenId.AS);
castExpression.TypeReference = ParseTypeReference();
Match(TokenId.RightParentheses);
return castExpression;
}
case TokenId.CASE:
{
NextToken();
CaseExpression caseExpression = new CaseExpression();
if (_token.Id != TokenId.WHEN && _token.Id != TokenId.ELSE && _token.Id != TokenId.END)
caseExpression.InputExpression = ParseExpression();
List<ExpressionNode> whenExpressionList = new List<ExpressionNode>();
List<ExpressionNode> expressionList = new List<ExpressionNode>();
if (_token.Id != TokenId.WHEN)
{
Match(TokenId.WHEN);
}
else
{
while (_token.Id == TokenId.WHEN)
{
NextToken();
whenExpressionList.Add(ParseExpression());
Match(TokenId.THEN);
expressionList.Add(ParseExpression());
}
}
caseExpression.WhenExpressions = whenExpressionList.ToArray();
caseExpression.ThenExpressions = expressionList.ToArray();
if (_token.Id == TokenId.ELSE)
{
NextToken();
caseExpression.ElseExpression = ParseExpression();
}
Match(TokenId.END);
return caseExpression;
}
case TokenId.COALESCE:
{
NextToken();
CoalesceExpression coalesceExpression = new CoalesceExpression();
coalesceExpression.Expressions = ParseExpressionList();
return coalesceExpression;
}
case TokenId.NULLIF:
{
NextToken();
NullIfExpression nullIfExpression = new NullIfExpression();
Match(TokenId.LeftParentheses);
nullIfExpression.LeftExpression = ParseExpression();
Match(TokenId.Comma);
nullIfExpression.RightExpression = ParseExpression();
Match(TokenId.RightParentheses);
return nullIfExpression;
}
case TokenId.Identifier:
{
_rangeRecorder.Begin();
Identifier name = ParseIdentifier();
SourceRange nameSourceRange = _rangeRecorder.End();
if (_token.Id != TokenId.LeftParentheses)
{
NameExpression result = new NameExpression();
result.Name = name;
result.NameSourceRange = nameSourceRange;
return result;
}
else
{
bool hasAsteriskModifier;
ExpressionNode[] args;
if (_lookahead.Id != TokenId.Multiply)
{
hasAsteriskModifier = false;
args = ParseExpressionList();
}
else
{
NextToken();
NextToken();
Match(TokenId.RightParentheses);
hasAsteriskModifier = true;
args = new ExpressionNode[0];
}
FunctionInvocationExpression result = new FunctionInvocationExpression();
result.Name = name;
result.NameSourceRange = nameSourceRange;
result.Arguments = args;
result.HasAsteriskModifier = hasAsteriskModifier;
return result;
}
}
case TokenId.LeftParentheses:
{
NextToken();
ExpressionNode expr;
if (_token.Id != TokenId.SELECT)
{
expr = ParseExpression();
}
else
{
SingleRowSubselect singleRowSubselect = new SingleRowSubselect();
singleRowSubselect.Query = ParseQuery();
expr = singleRowSubselect;
}
Match(TokenId.RightParentheses);
return expr;
}
default:
{
_errorReporter.SimpleExpressionExpected(_token.Range, _token.Text);
return LiteralExpression.FromNull();
}
}
}
public static ExpressionNode[] SplitCondition(LogicalOperator logicalOperator, ExpressionNode condition)
{
PartExtractor partExtractor = new PartExtractor(logicalOperator);
partExtractor.Visit(condition);
return partExtractor.GetParts();
}
private void EmitCall(MethodInfo method, ExpressionNode instance, params ExpressionNode[] args)
{
ParameterInfo[] parameterInfos = method.GetParameters();
int instanceLocalIndex = -1;
if (instance != null)
{
instanceLocalIndex = DeclareLocal();
}
int[] argLocalIndexes = new int[args.Length];
for (int i = 0; i < args.Length; i++)
{
argLocalIndexes[i] = DeclareLocal();
}
if (instance != null)
{
Visit(instance);
_ilEmitContext.ILGenerator.Emit(OpCodes.Stloc, instanceLocalIndex);
}
for (int i = 0; i < args.Length; i++)
{
Visit(args[i]);
_ilEmitContext.ILGenerator.Emit(OpCodes.Stloc, argLocalIndexes[i]);
}
Label loadNullLabel = _ilEmitContext.ILGenerator.DefineLabel();
Label finishLabel = _ilEmitContext.ILGenerator.DefineLabel();
if (instance != null)
{
_ilEmitContext.ILGenerator.Emit(OpCodes.Ldloc, instanceLocalIndex);
_ilEmitContext.ILGenerator.Emit(OpCodes.Brfalse, loadNullLabel);
}
for (int i = 0; i < args.Length; i++)
{
_ilEmitContext.ILGenerator.Emit(OpCodes.Ldloc, argLocalIndexes[i]);
_ilEmitContext.ILGenerator.Emit(OpCodes.Brfalse, loadNullLabel);
}
if (instance != null)
{
_ilEmitContext.ILGenerator.Emit(OpCodes.Ldloc, instanceLocalIndex);
EmitThisArgumentPointer(instance.ExpressionType);
}
for (int i = 0; i < args.Length; i++)
{
_ilEmitContext.ILGenerator.Emit(OpCodes.Ldloc, argLocalIndexes[i]);
if (parameterInfos[i].ParameterType != typeof(object))
{
EmitConversion(parameterInfos[i].ParameterType);
}
}
EmitRawCall(method, instance == null ? null : instance.ExpressionType);
if (method.ReturnType.IsValueType)
{
_ilEmitContext.ILGenerator.Emit(OpCodes.Box, method.ReturnType);
}
_ilEmitContext.ILGenerator.Emit(OpCodes.Br, finishLabel);
_ilEmitContext.ILGenerator.MarkLabel(loadNullLabel);
_ilEmitContext.ILGenerator.Emit(OpCodes.Ldnull);
_ilEmitContext.ILGenerator.MarkLabel(finishLabel);
}
public static RuntimeExpression CreateInterpreded(ExpressionNode expressionNode)
{
return(new InterpretedRuntimeExpression(expressionNode));
}
public InterpretedRuntimeExpression(ExpressionNode expressionNode)
{
_expressionNode = expressionNode;
}
public static RuntimeExpression CreateInterpreded(ExpressionNode expressionNode)
{
return new InterpretedRuntimeExpression(expressionNode);
}
public override ExpressionNode VisitCaseExpression(CaseExpression expression)
{
// NOTE: It is assumed that simple case expressions are already transformed into
// searched case expressions, i.e.
// CASE
// WHEN Pred1 THEN Expr1 ...
// WHEN PredN THEN ExprN
// [ELSE ElseExpr]
// END
List<ExpressionNode> processedWhenExpressions = new List<ExpressionNode>();
for (int i = 0; i < expression.WhenExpressions.Length; i++)
{
SetWhenPassthru(processedWhenExpressions);
expression.WhenExpressions[i] = VisitExpression(expression.WhenExpressions[i]);
processedWhenExpressions.Add(expression.WhenExpressions[i]);
SetThenPassthru(processedWhenExpressions);
expression.ThenExpressions[i] = VisitExpression(expression.ThenExpressions[i]);
}
if (expression.ElseExpression != null)
{
SetWhenPassthru(processedWhenExpressions);
expression.ElseExpression = VisitExpression(expression.ElseExpression);
}
_currentPassthruPredicate = null;
return expression;
}
void IErrorReporter.CannotCast(ExpressionNode expression, Type targetType)
{
string message = String.Format(CultureInfo.CurrentCulture, Resources.CannotCast, expression.GenerateSource(), FormattingHelpers.FormatType(expression.ExpressionType), FormattingHelpers.FormatType(targetType));
HandleError(ErrorId.CannotCast, message);
}
void IErrorReporter.AsteriskModifierNotAllowed(SourceRange sourceRange, ExpressionNode functionInvocation)
{
string message = String.Format(CultureInfo.CurrentCulture, Resources.AsteriskModifierNotAllowed, functionInvocation.GenerateSource());
HandleError(sourceRange, ErrorId.AsteriskModifierNotAllowed, message);
}
public void Push(ExpressionNode expression)
{
_expressionStack.Push(expression);
}
public static bool IsNull(ExpressionNode expression)
{
ConstantExpression constantExpression = expression as ConstantExpression;
return (constantExpression != null && constantExpression.IsNullValue);
}
private void SetWhenPassthru(ICollection<ExpressionNode> processedWhenExpressions)
{
if (processedWhenExpressions.Count == 0)
{
_currentPassthruPredicate = null;
}
else
{
foreach (ExpressionNode processedWhenExpression in processedWhenExpressions)
{
ExpressionNode clonedExpr = (ExpressionNode) processedWhenExpression.Clone();
_expressionBuilder.Push(clonedExpr);
}
_expressionBuilder.PushNAry(LogicalOperator.Or);
_currentPassthruPredicate = _expressionBuilder.Pop();
}
}
void IErrorReporter.WhenMustEvaluateToBoolIfCaseInputIsOmitted(ExpressionNode whenExpression)
{
string message = String.Format(CultureInfo.CurrentCulture, Resources.WhenMustEvaluateToBoolIfCaseInputIsOmitted, whenExpression.GenerateSource(), FormattingHelpers.FormatType(typeof(bool)));
HandleError(ErrorId.WhenMustEvaluateToBoolIfCaseInputIsOmitted, message);
}
private RuntimeExpression CreateRuntimeExpression(ExpressionNode expression, params BoundRowBufferEntrySet[] boundRowBufferEntrySets)
{
// Update row buffer references
List<BoundRowBufferEntrySet> boundRowBufferEntrySetList = new List<BoundRowBufferEntrySet>();
boundRowBufferEntrySetList.AddRange(boundRowBufferEntrySets);
foreach (BoundRowBufferEntrySet outerreferenceBoundRowBufferEntrySet in _outerReferenceStack)
boundRowBufferEntrySetList.Add(outerreferenceBoundRowBufferEntrySet);
boundRowBufferEntrySets = boundRowBufferEntrySetList.ToArray();
RowBufferEntryExpressionUpdater rowBufferEntryExpressionUpdater = new RowBufferEntryExpressionUpdater(boundRowBufferEntrySets);
expression = rowBufferEntryExpressionUpdater.VisitExpression(expression);
#if COMPILE_IL
return ExpressionCompiler.CreateCompiled(expression);
#else
return ExpressionCompiler.CreateInterpreded(expression);
#endif
}
private static ExpressionNode ReplaceAlreadyComputedSubsequences(ExpressionNode expression, IEnumerable<ComputedValueDefinition> alreadyComputedBufferedValues)
{
ComputedSubsequenceReplacer replacer = new ComputedSubsequenceReplacer(alreadyComputedBufferedValues);
return replacer.VisitExpression(expression);
}
public IsNullExpression(bool negated, ExpressionNode expression)
{
_negated = negated;
_expression = expression;
}
public UnaryExpression(UnaryOperator op, ExpressionNode operand)
{
_op = op;
_operand = operand;
}
public SelectColumn(ExpressionNode expression, Identifier columnAlias)
{
_expression = expression;
_alias = columnAlias;
}
private ExpressionNode ParseSubExpression(ExpressionNode left, int precedence)
{
if (left == null)
{
// No left operand, so we parse one and take care about leading unary operators
if (_token.Info.UnaryOperator != null)
{
UnaryOperator op = _token.Info.UnaryOperator;
NextToken();
ExpressionNode expr = ParseSubExpression(null, op.Precedence);
left = new UnaryExpression(op, expr);
}
else
{
left = ParseSimpleExpression();
}
}
while (_token.Id != TokenId.Eof)
{
// Special handling for NOT BETWEEN, NOT IN, NOT LIKE, NOT SIMILAR TO, and NOT SOUNDSLIKE.
bool negated = false;
if (_token.Id == TokenId.NOT)
{
if (_lookahead.Id == TokenId.BETWEEN ||
_lookahead.Id == TokenId.IN ||
_lookahead.Id == TokenId.LIKE ||
_lookahead.Id == TokenId.SIMILAR ||
_lookahead.Id == TokenId.SOUNDSLIKE)
{
NextToken();
negated = true;
}
}
// Special handling for the only ternary operator BETWEEN
if (_token.Id == TokenId.BETWEEN)
{
NextToken();
ExpressionNode lowerBound = ParseSubExpression(null, Operator.BETWEEN_PRECEDENCE);
Match(TokenId.AND);
ExpressionNode upperBound = ParseSubExpression(null, Operator.BETWEEN_PRECEDENCE);
left = new BetweenExpression(left, lowerBound, upperBound);
}
else
{
// If there is no binary operator we are finished
if (_token.Info.BinaryOperator == null)
break;
BinaryOperator binaryOp = _token.Info.BinaryOperator;
// Precedence is lower, parse it later
if (binaryOp.Precedence < precedence)
break;
// Precedence is equal, but operator ist not right associative, parse it later
if (binaryOp.Precedence == precedence && !binaryOp.IsRightAssociative)
break;
// Precedence is higher
NextToken();
// Special handling for SIMILAR TO
if (binaryOp == BinaryOperator.SimilarTo)
Match(TokenId.TO);
if (binaryOp == BinaryOperator.In)
{
// Special handling for IN
InExpression inExpression = new InExpression();
inExpression.Left = left;
inExpression.RightExpressions = ParseSimpleQueryExpressionList();
left = inExpression;
}
else if (_token.Id == TokenId.ANY || _token.Id == TokenId.SOME || _token.Id == TokenId.ALL)
{
// Special handling for ANY (SOME) and ALL
if (binaryOp != BinaryOperator.Equal &&
binaryOp != BinaryOperator.NotEqual &&
binaryOp != BinaryOperator.Less &&
binaryOp != BinaryOperator.LessOrEqual &&
binaryOp != BinaryOperator.Greater &&
binaryOp != BinaryOperator.GreaterOrEqual)
{
_errorReporter.InvalidOperatorForAllAny(_token.Range, binaryOp);
}
AllAnySubselect allAnySubselect = new AllAnySubselect();
allAnySubselect.Left = left;
allAnySubselect.Op = binaryOp;
allAnySubselect.Type = (_token.Id == TokenId.ALL) ? AllAnySubselect.AllAnyType.All : AllAnySubselect.AllAnyType.Any;
NextToken();
Match(TokenId.LeftParentheses);
allAnySubselect.Query = ParseQuery();
Match(TokenId.RightParentheses);
left = allAnySubselect;
}
else
{
left = new BinaryExpression(binaryOp, left, ParseSubExpression(null, binaryOp.Precedence));
}
}
// Special handling for negated expressions (see above)
if (negated)
left = new UnaryExpression(UnaryOperator.LogicalNot, left);
}
return left;
}
private static void CreateBufferedValue(ExpressionNode expression, ICollection<ComputedValueDefinition> computedColumnList, ICollection<RowBufferEntry> columnList, IEnumerable<ComputedValueDefinition> alreadyComputedBufferedValues)
{
if (alreadyComputedBufferedValues != null)
expression = ReplaceAlreadyComputedSubsequences(expression, alreadyComputedBufferedValues);
foreach (ComputedValueDefinition computedBufferedValue in computedColumnList)
{
if (expression.IsStructuralEqualTo(computedBufferedValue.Expression))
{
columnList.Add(computedBufferedValue.Target);
return;
}
}
RowBufferEntryExpression rowBufferExpression = expression as RowBufferEntryExpression;
if (rowBufferExpression != null)
{
columnList.Add(rowBufferExpression.RowBufferEntry);
}
else
{
RowBufferEntry rowBufferEntry = new RowBufferEntry(expression.ExpressionType);
columnList.Add(rowBufferEntry);
ComputedValueDefinition computedValue = new ComputedValueDefinition();
computedValue.Target = rowBufferEntry;
computedValue.Expression = expression;
computedColumnList.Add(computedValue);
}
}
public InterpretedRuntimeExpression(ExpressionNode expressionNode)
{
_expressionNode = expressionNode;
}
