internal override SqlSource VisitJoin(SqlJoin join)
{
join.Left = this.VisitSource(join.Left);
join.Right = this.VisitSource(join.Right);
join.Condition = this.VisitPredicate(join.Condition);
return join;
}
internal override SqlExpression VisitMultiset(SqlSubSelect sms)
{
// allow one big-join per query?
if((this.options & SqlMultiplexerOptionType.EnableBigJoin) != 0 &&
!this.hasBigJoin && this.canJoin && this.isTopLevel && this.outerSelect != null
&& !MultisetChecker.HasMultiset(sms.Select.Selection)
&& BigJoinChecker.CanBigJoin(sms.Select))
{
sms.Select = this.VisitSelect(sms.Select);
SqlAlias alias = new SqlAlias(sms.Select);
SqlJoin join = new SqlJoin(SqlJoinType.OuterApply, this.outerSelect.From, alias, null, sms.SourceExpression);
this.outerSelect.From = @join;
this.outerSelect.OrderingType = SqlOrderingType.Always;
// make joined expression
SqlExpression expr = (SqlExpression)SqlDuplicator.Copy(sms.Select.Selection);
// make count expression
SqlSelect copySelect = (SqlSelect)SqlDuplicator.Copy(sms.Select);
SqlAlias copyAlias = new SqlAlias(copySelect);
SqlSelect countSelect = new SqlSelect(sql.Unary(SqlNodeType.Count, null, sms.SourceExpression), copyAlias, sms.SourceExpression);
countSelect.OrderingType = SqlOrderingType.Never;
SqlExpression count = sql.SubSelect(SqlNodeType.ScalarSubSelect, countSelect);
// make joined collection
SqlJoinedCollection jc = new SqlJoinedCollection(sms.ClrType, sms.SqlType, expr, count, sms.SourceExpression);
this.hasBigJoin = true;
return jc;
}
return QueryExtractor.Extract(sms, this.parentParameters);
}
internal override SqlSource VisitJoin(SqlJoin join)
{
// block where clauses from being lifted out of the cardinality-dependent
// side of an outer join.
Scope save = this.current;
try
{
switch(@join.JoinType)
{
case SqlJoinType.Cross:
case SqlJoinType.CrossApply:
case SqlJoinType.Inner:
return base.VisitJoin(@join);
case SqlJoinType.LeftOuter:
case SqlJoinType.OuterApply:
{
@join.Left = this.VisitSource(@join.Left);
this.current = null;
@join.Right = this.VisitSource(@join.Right);
@join.Condition = this.VisitExpression(@join.Condition);
return @join;
}
default:
this.current = null;
return base.VisitJoin(@join);
}
}
finally
{
this.current = save;
}
}
internal override SqlSource VisitJoin(SqlJoin join)
{
SqlScope save = this.CurrentScope;
switch(join.JoinType)
{
case SqlJoinType.CrossApply:
case SqlJoinType.OuterApply:
{
this.Visit(join.Left);
SqlScope tmp = new SqlScope(join.Left, this.CurrentScope.ContainingScope);
this.CurrentScope = new SqlScope(null, tmp);
this.Visit(join.Right);
SqlScope tmp2 = new SqlScope(join.Right, tmp);
this.CurrentScope = new SqlScope(null, tmp2);
this.Visit(join.Condition);
break;
}
default:
{
this.Visit(join.Left);
this.Visit(join.Right);
this.CurrentScope = new SqlScope(null, new SqlScope(join.Right, new SqlScope(join.Left, this.CurrentScope.ContainingScope)));
this.Visit(join.Condition);
break;
}
}
this.CurrentScope = save;
return join;
}
internal override SqlSource VisitJoin(SqlJoin join)
{
base.VisitJoin(@join);
if(@join.Condition != null)
{
this.CheckJoinCondition(@join.Condition);
}
return @join;
}
internal override SqlSource VisitJoin(SqlJoin join)
{
this.Visit(@join.Left);
List<SqlOrderExpression> leftOrders = this.orders;
this.orders = null;
this.Visit(@join.Right);
this.PrependOrderExpressions(leftOrders);
return @join;
}
internal override SqlSource VisitJoin(SqlJoin join)
{
if(join.JoinType == SqlJoinType.CrossApply)
{
// Look down the left side to see what table aliases are produced.
HashSet<SqlAlias> p = SqlGatherProducedAliases.Gather(join.Left);
// Look down the right side to see what table aliases are consumed.
HashSet<SqlAlias> c = SqlGatherConsumedAliases.Gather(join.Right);
// Look at each consumed alias and see if they are mentioned in produced.
if(p.Overlaps(c))
{
Annotations.Add(join, new CompatibilityAnnotation(Strings.SourceExpressionAnnotation(join.SourceExpression), _providerModesWithIncompatibilities));
// Can't reduce because this consumed alias is produced on the left.
return base.VisitJoin(join);
}
// Can turn this into a CROSS JOIN
join.JoinType = SqlJoinType.Cross;
return VisitJoin(join);
}
return base.VisitJoin(join);
}
internal override SqlSource VisitJoin(SqlJoin join)
{
switch(join.JoinType)
{
case SqlJoinType.CrossApply:
case SqlJoinType.OuterApply:
{
this.Visit(join.Left);
if(this.found == null)
{
this.Visit(join.Right);
}
break;
}
default:
{
this.Visit(join.Left);
this.Visit(join.Right);
break;
}
}
return join;
}
internal override SqlSource VisitJoin(SqlJoin join)
{
base.VisitJoin(@join);
switch(@join.JoinType)
{
case SqlJoinType.Cross:
case SqlJoinType.Inner:
// reducing either side would effect cardinality of results
break;
case SqlJoinType.LeftOuter:
case SqlJoinType.CrossApply:
case SqlJoinType.OuterApply:
// may reduce to left if no references to the right
if(this.HasEmptySource(@join.Right))
{
SqlAlias a = (SqlAlias)@join.Right;
_removedMap[a] = a;
return @join.Left;
}
break;
}
return @join;
}
internal override SqlSource VisitJoin(SqlJoin join)
{
@join.Condition = this.VisitExpression(@join.Condition);
@join.Right = this.VisitSource(@join.Right);
@join.Left = this.VisitSource(@join.Left);
return @join;
}
internal override SqlSource VisitJoin(SqlJoin join)
{
if(join.JoinType == SqlJoinType.CrossApply)
{
// Visit the left side as usual.
join.Left = this.VisitSource(join.Left);
// Visit the condition as usual.
join.Condition = this.VisitExpression(join.Condition);
// Visit the right, with the expressionSink set.
SelectScope s = expressionSink;
expressionSink = new SelectScope();
expressionSink.LeftProduction = SqlGatherProducedAliases.Gather(join.Left);
join.Right = this.VisitSource(join.Right);
// Were liftable expressions found?
SqlSource newSource = join;
foreach(List<SqlColumn> cols in expressionSink.Lifted)
{
newSource = PushSourceDown(newSource, cols);
}
expressionSink = s;
return newSource;
}
return base.VisitJoin(join);
}
internal virtual SqlSource VisitJoin(SqlJoin join) {
join.Left = this.VisitSource(join.Left);
join.Right = this.VisitSource(join.Right);
join.Condition = this.VisitExpression(join.Condition);
return join;
}
private SqlSelect VisitDefaultIfEmpty(Expression sequence)
{
SqlSelect select = this.VisitSequence(sequence);
SqlAlias alias = new SqlAlias(select);
SqlAliasRef aliasRef = new SqlAliasRef(alias);
SqlExpression opt = new SqlOptionalValue(
new SqlColumn(
"test",
_nodeFactory.Unary(SqlNodeType.OuterJoinedValue,
_nodeFactory.Value(typeof(int?), _typeProvider.From(typeof(int)), 1, false, _dominatingExpression)
)
),
_nodeFactory.Unary(SqlNodeType.OuterJoinedValue, aliasRef)
);
SqlSelect optSelect = new SqlSelect(opt, alias, _dominatingExpression);
alias = new SqlAlias(optSelect);
aliasRef = new SqlAliasRef(alias);
SqlExpression litNull = _nodeFactory.TypedLiteralNull(typeof(string), _dominatingExpression);
SqlSelect selNull = new SqlSelect(litNull, null, _dominatingExpression);
SqlAlias aliasNull = new SqlAlias(selNull);
SqlJoin join = new SqlJoin(SqlJoinType.OuterApply, aliasNull, alias, null, _dominatingExpression);
return new SqlSelect(aliasRef, join, _dominatingExpression);
}
private SqlSelect VisitJoin(Expression outerSequence, Expression innerSequence, LambdaExpression outerKeySelector, LambdaExpression innerKeySelector, LambdaExpression resultSelector)
{
SqlSelect outerSelect = this.VisitSequence(outerSequence);
SqlSelect innerSelect = this.VisitSequence(innerSequence);
SqlAlias outerAlias = new SqlAlias(outerSelect);
SqlAliasRef outerRef = new SqlAliasRef(outerAlias);
SqlAlias innerAlias = new SqlAlias(innerSelect);
SqlAliasRef innerRef = new SqlAliasRef(innerAlias);
_parameterExpressionToSqlExpression[outerKeySelector.Parameters[0]] = outerRef;
SqlExpression outerKey = this.VisitExpression(outerKeySelector.Body);
_parameterExpressionToSqlExpression[innerKeySelector.Parameters[0]] = innerRef;
SqlExpression innerKey = this.VisitExpression(innerKeySelector.Body);
_parameterExpressionToSqlExpression[resultSelector.Parameters[0]] = outerRef;
_parameterExpressionToSqlExpression[resultSelector.Parameters[1]] = innerRef;
SqlExpression result = this.VisitExpression(resultSelector.Body);
SqlExpression condition = _nodeFactory.Binary(SqlNodeType.EQ, outerKey, innerKey);
SqlSelect select = null;
if((_converterStrategy & ConverterStrategy.CanUseJoinOn) != 0)
{
SqlJoin join = new SqlJoin(SqlJoinType.Inner, outerAlias, innerAlias, condition, _dominatingExpression);
select = new SqlSelect(result, join, _dominatingExpression);
}
else
{
SqlJoin join = new SqlJoin(SqlJoinType.Cross, outerAlias, innerAlias, null, _dominatingExpression);
select = new SqlSelect(result, join, _dominatingExpression);
select.Where = condition;
}
return select;
}
private SqlSelect VisitSelectMany(Expression sequence, LambdaExpression colSelector, LambdaExpression resultSelector)
{
SqlSelect seqSelect = this.VisitSequence(sequence);
SqlAlias seqAlias = new SqlAlias(seqSelect);
SqlAliasRef seqRef = new SqlAliasRef(seqAlias);
_parameterExpressionToSqlExpression[colSelector.Parameters[0]] = seqRef;
SqlNode colSelectorNode = this.VisitSequence(colSelector.Body);
SqlAlias selAlias = new SqlAlias(colSelectorNode);
SqlAliasRef selRef = new SqlAliasRef(selAlias);
SqlJoin join = new SqlJoin(SqlJoinType.CrossApply, seqAlias, selAlias, null, _dominatingExpression);
SqlExpression projection = selRef;
if(resultSelector != null)
{
_parameterExpressionToSqlExpression[resultSelector.Parameters[0]] = seqRef;
_parameterExpressionToSqlExpression[resultSelector.Parameters[1]] = selRef;
projection = this.VisitExpression(resultSelector.Body);
}
return new SqlSelect(projection, join, _dominatingExpression);
}
private SqlSelect VisitSelect(Expression sequence, LambdaExpression selector)
{
SqlSelect source = this.VisitSequence(sequence);
SqlAlias alias = new SqlAlias(source);
SqlAliasRef aref = new SqlAliasRef(alias);
_parameterExpressionToSqlExpression[selector.Parameters[0]] = aref;
SqlNode project = this.Visit(selector.Body);
SqlSelect pselect = project as SqlSelect;
if(pselect != null)
{
return new SqlSelect(_nodeFactory.SubSelect(SqlNodeType.Multiset, pselect, selector.Body.Type), alias, _dominatingExpression);
}
else if((project.NodeType == SqlNodeType.Element || project.NodeType == SqlNodeType.ScalarSubSelect) &&
(_converterStrategy & ConverterStrategy.CanUseOuterApply) != 0)
{
SqlSubSelect sub = (SqlSubSelect)project;
SqlSelect inner = sub.Select;
SqlAlias innerAlias = new SqlAlias(inner);
SqlAliasRef innerRef = new SqlAliasRef(innerAlias);
if(project.NodeType == SqlNodeType.Element)
{
inner.Selection = new SqlOptionalValue(
new SqlColumn(
"test",
_nodeFactory.Unary(
SqlNodeType.OuterJoinedValue,
_nodeFactory.Value(typeof(int?), _typeProvider.From(typeof(int)), 1, false, _dominatingExpression)
)
),
_nodeFactory.Unary(SqlNodeType.OuterJoinedValue, inner.Selection)
);
}
else
{
inner.Selection = _nodeFactory.Unary(SqlNodeType.OuterJoinedValue, inner.Selection);
}
SqlJoin join = new SqlJoin(SqlJoinType.OuterApply, alias, innerAlias, null, _dominatingExpression);
return new SqlSelect(innerRef, join, _dominatingExpression);
}
else
{
SqlExpression expr = project as SqlExpression;
if(expr != null)
{
return new SqlSelect(expr, alias, _dominatingExpression);
}
else
{
throw Error.BadProjectionInSelect();
}
}
}
internal override SqlSource VisitJoin(SqlJoin join)
{
SqlSource left = this.VisitSource(@join.Left);
SqlSource right = this.VisitSource(@join.Right);
SqlExpression cond = (SqlExpression)this.Visit(@join.Condition);
return new SqlJoin(@join.JoinType, left, right, cond, @join.SourceExpression);
}
internal override SqlSource VisitJoin(SqlJoin join) {
if (@join.JoinType == SqlJoinType.CrossApply ||
@join.JoinType == SqlJoinType.OuterApply) {
@join.Left = this.VisitSource(@join.Left);
SqlSelect saveSelect = this.currentSelect;
try {
this.currentSelect = this.GetSourceSelect(@join.Left);
@join.Right = this.VisitSource(@join.Right);
this.currentSelect = null;
@join.Condition = this.VisitExpression(@join.Condition);
return @join;
}
finally {
this.currentSelect = saveSelect;
}
}
else {
return base.VisitJoin(@join);
}
}
internal override SqlSource VisitJoin(SqlJoin join)
{
this.ReferenceColumns(@join.Condition);
return base.VisitJoin(@join);
}
internal override SqlSource VisitJoin(SqlJoin join)
{
this.Visit(@join.Left);
this.NewLine();
switch(@join.JoinType)
{
case SqlJoinType.CrossApply:
_commandStringBuilder.Append("CROSS APPLY ");
break;
case SqlJoinType.Cross:
_commandStringBuilder.Append("CROSS JOIN ");
break;
case SqlJoinType.Inner:
_commandStringBuilder.Append("INNER JOIN ");
break;
case SqlJoinType.LeftOuter:
_commandStringBuilder.Append("LEFT OUTER JOIN ");
break;
case SqlJoinType.OuterApply:
_commandStringBuilder.Append("OUTER APPLY ");
break;
}
SqlJoin rightJoin = @join.Right as SqlJoin;
if(rightJoin == null ||
(rightJoin.JoinType == SqlJoinType.Cross
&& @join.JoinType != SqlJoinType.CrossApply
&& @join.JoinType != SqlJoinType.OuterApply))
{
this.Visit(@join.Right);
}
else
{
this.VisitJoinSource(@join.Right);
}
if(@join.Condition != null)
{
_commandStringBuilder.Append(" ON ");
this.Visit(@join.Condition);
}
else if(this.RequiresOnCondition(@join.JoinType))
{
_commandStringBuilder.Append(" ON 1=1 ");
}
return @join;
}
