internal override SqlSelect VisitSelect(SqlSelect select)
{
bool saveForceReferenceAll = _forceReferenceAll;
_forceReferenceAll = false;
bool saveIsTopLevel = _isTopLevel;
try
{
if(_isTopLevel)
{
// top-level projection references columns!
@select.Selection = this.VisitExpression(@select.Selection);
}
_isTopLevel = false;
for(int i = @select.Row.Columns.Count - 1; i >= 0; i--)
{
SqlColumn c = @select.Row.Columns[i];
bool safeToRemove =
!saveForceReferenceAll
&& !_referenceMap.ContainsKey(c)
// don't remove anything from a distinct select (except maybe a literal value) since it would change the meaning of the comparison
&& [email protected]
// don't remove an aggregate expression that may be the only expression that forces the grouping (since it would change the cardinality of the results)
&& !(@select.GroupBy.Count == 0 && _aggregateChecker.HasAggregates(c.Expression));
if(safeToRemove)
{
@select.Row.Columns.RemoveAt(i);
}
else
{
this.VisitExpression(c.Expression);
}
}
@select.Top = this.VisitExpression(@select.Top);
for(int i = @select.OrderBy.Count - 1; i >= 0; i--)
{
@select.OrderBy[i].Expression = this.VisitExpression(@select.OrderBy[i].Expression);
}
@select.Having = this.VisitExpression(@select.Having);
for(int i = @select.GroupBy.Count - 1; i >= 0; i--)
{
@select.GroupBy[i] = this.VisitExpression(@select.GroupBy[i]);
}
@select.Where = this.VisitExpression(@select.Where);
@select.From = this.VisitSource(@select.From);
}
finally
{
_isTopLevel = saveIsTopLevel;
_forceReferenceAll = saveForceReferenceAll;
}
return @select;
}
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);
}
private static ProviderType GetSqlType(SqlNode node)
{
SqlExpression exp = node as SqlExpression;
if (exp != null)
{
return(exp.SqlType);
}
SqlSelect sel = node as SqlSelect;
if (sel != null)
{
return(sel.Selection.SqlType);
}
SqlTable tab = node as SqlTable;
if (tab != null)
{
return(tab.SqlRowType);
}
SqlUnion su = node as SqlUnion;
if (su != null)
{
return(su.GetSqlType());
}
throw Error.UnexpectedNode(node.NodeType);
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
Scope save = this.current;
this.current = new Scope(select.Where, this.current);
SqlSelect result = base.VisitSelect(select);
bool stopHoisting =
select.IsDistinct ||
select.GroupBy.Count > 0 ||
this.aggregateChecker.HasAggregates(select) ||
select.Top != null ||
this.rowNumberChecker.HasRowNumber(select);
// Shift as much of the current WHERE to the parent as possible.
if(this.current != null)
{
if(this.current.Parent != null && !stopHoisting)
{
this.current.Parent.Where = sql.AndAccumulate(this.current.Parent.Where, this.current.Where);
this.current.Where = null;
}
select.Where = this.current.Where;
}
this.current = save;
return result;
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
this.Visit(select.Row);
this.Visit(select.Where);
return select;
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
select.From = (SqlSource)this.Visit(select.From);
SqlScope save = this.CurrentScope;
this.CurrentScope = new SqlScope(select.From, this.CurrentScope.ContainingScope);
select.Where = this.VisitExpression(select.Where);
for(int i = 0, n = select.GroupBy.Count; i < n; i++)
{
select.GroupBy[i] = this.VisitExpression(select.GroupBy[i]);
}
select.Having = this.VisitExpression(select.Having);
for(int i = 0, n = select.OrderBy.Count; i < n; i++)
{
select.OrderBy[i].Expression = this.VisitExpression(select.OrderBy[i].Expression);
}
select.Top = this.VisitExpression(select.Top);
select.Row = (SqlRow)this.Visit(select.Row);
// selection must be able to see its own projection
this.CurrentScope = new SqlScope(select, this.CurrentScope.ContainingScope);
select.Selection = this.VisitExpression(select.Selection);
this.CurrentScope = save;
return select;
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
if(_isTopLevel)
{
@select.Selection = _sDeflator.VisitExpression(@select.Selection);
}
return @select;
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
foreach(SqlColumn c in @select.Row.Columns)
{
this.columns.Add(c);
}
return @select;
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
bool saveTop = this.topLevel;
this.topLevel = false;
@select = this.VisitSelectCore(@select);
this.topLevel = saveTop;
@select.Selection = this.VisitExpression(@select.Selection);
return @select;
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
base.VisitSelect(@select);
if(@select.Where != null)
{
this.CheckJoinCondition(@select.Where);
}
return @select;
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
if(select.IsDistinct)
{
_isDistinct = true;
// get all members from selection
this.AddIdentityMembers(select.Selection.ClrType.GetProperties());
return select;
}
// We're not distinct, but let's check our sources...
select.From = (SqlSource)base.Visit(select.From);
if(_identityMembers == null || _identityMembers.Count == 0)
{
throw Error.SkipRequiresSingleTableQueryWithPKs();
}
switch(select.Selection.NodeType)
{
case SqlNodeType.Column:
case SqlNodeType.ColumnRef:
case SqlNodeType.Member:
{
// we've got a bare member/column node, eg "select c.CustomerId"
// find out if it refers to the table's PK, of which there must be only 1
if(_identityMembers.Count == 1)
{
MemberInfo column = _identityMembers[0];
_isValid &= IsColumnMatch(column, @select.Selection);
}
else
{
_isValid = false;
}
break;
}
case SqlNodeType.New:
case SqlNodeType.AliasRef:
{
select.Selection = this.VisitExpression(@select.Selection);
break;
}
case SqlNodeType.Treat:
case SqlNodeType.TypeCase:
{
break;
}
default:
{
_isValid = false;
break;
}
}
return select;
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
// big-joins may need to lift PK's out for default ordering, so don't allow big-join if we see these
this.canBigJoin &= select.GroupBy.Count == 0 && select.Top == null && !select.IsDistinct;
if(!this.canBigJoin)
{
return select;
}
return base.VisitSelect(select);
}
private bool IsTrivialSelect(SqlSelect select)
{
if(@select.OrderBy.Count != 0 ||
@select.GroupBy.Count != 0 ||
@select.Having != null ||
@select.Top != null ||
@select.IsDistinct ||
@select.Where != null)
return false;
return this.HasTrivialSource(@select.From) && this.HasTrivialProjection(@select);
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
SelectScope s = expressionSink;
#warning [FB] REFACTOR SQL Server specific (TOP). Change it to reflect limiting but not through the usage of 'Top'.
// Don't lift through a TOP.
if(select.Top != null)
{
expressionSink = null;
}
// Don't lift through a GROUP BY (or implicit GROUP BY).
if(select.GroupBy.Count > 0 || this.aggregateChecker.HasAggregates(select))
{
expressionSink = null;
}
// Don't lift through DISTINCT
if(select.IsDistinct)
{
expressionSink = null;
}
if(expressionSink != null)
{
List<SqlColumn> keep = new List<SqlColumn>();
List<SqlColumn> lift = new List<SqlColumn>();
foreach(SqlColumn sc in select.Row.Columns)
{
bool referencesLeftsideAliases = SqlAliasesReferenced.ReferencesAny(sc.Expression, expressionSink.LeftProduction);
bool isLockedExpression = expressionSink.ReferencedExpressions.Contains(sc);
if(referencesLeftsideAliases && !isLockedExpression)
{
lift.Add(sc);
}
else
{
keep.Add(sc);
}
}
select.Row.Columns.Clear();
select.Row.Columns.AddRange(keep);
if(lift.Count > 0)
{
expressionSink.Lifted.Push(lift);
}
}
SqlSelect sel = base.VisitSelect(select);
expressionSink = s;
return sel;
}
private void ConvertColumnsToMax(SqlSelect select, out bool changed, out bool containsLongExpressions)
{
SqlRow row = select.Row;
changed = false;
containsLongExpressions = false;
foreach(SqlColumn col in row.Columns)
{
bool columnChanged;
containsLongExpressions = containsLongExpressions || col.SqlType.IsLargeType;
col.Expression = ConvertToMax(col.Expression, out columnChanged);
changed = changed || columnChanged;
}
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
SqlSelect save = this.currentSelect;
try
{
this.currentSelect = @select;
return base.VisitSelect(@select);
}
finally
{
this.currentSelect = save;
}
}
internal override SqlSelect VisitSelectCore(SqlSelect select)
{
bool saveIsTopLevel = this.isTopLevel;
this.isTopLevel = false;
try
{
return base.VisitSelectCore(@select);
}
finally
{
this.isTopLevel = saveIsTopLevel;
}
}
internal SqlSubSelect(SqlNodeType nt , Type clrType, ProviderType sqlType , SqlSelect select)
: base(nt, clrType, sqlType, select.SourceExpression) {
switch (nt) {
case SqlNodeType.Multiset:
case SqlNodeType.ScalarSubSelect:
case SqlNodeType.Element:
case SqlNodeType.Exists:
break;
default:
throw Error.UnexpectedNode(nt);
}
this.Select = select;
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
if(select.IsDistinct)
{
bool changed;
bool containsLongExpressions;
ConvertColumnsToMax(select, out changed, out containsLongExpressions);
if(containsLongExpressions)
{
this.annotations.Add(select, new CompatibilityAnnotation(
Strings.TextNTextAndImageCannotOccurInDistinct(select.SourceExpression), SqlServerProviderMode.Sql2000, SqlServerProviderMode.SqlCE));
}
}
return base.VisitSelect(select);
}
internal SqlSubSelect(SqlNodeType nt, Type clrType, ProviderType sqlType, SqlSelect select)
: base(nt, clrType, sqlType, select.SourceExpression)
{
switch (nt)
{
case SqlNodeType.Multiset:
case SqlNodeType.ScalarSubSelect:
case SqlNodeType.Element:
case SqlNodeType.Exists:
break;
default:
throw Error.UnexpectedNode(nt);
}
this.Select = select;
}
internal ProviderType GetSqlType()
{
SqlExpression exp = this.Left as SqlExpression;
if (exp != null)
{
return(exp.SqlType);
}
SqlSelect sel = this.Left as SqlSelect;
if (sel != null)
{
return(sel.Selection.SqlType);
}
throw Error.CouldNotGetSqlType();
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
select.From = this.VisitSource(select.From);
select.Where = this.VisitExpression(select.Where);
for(int i = 0, n = select.GroupBy.Count; i < n; i++)
{
select.GroupBy[i] = this.VisitExpression(select.GroupBy[i]);
}
// remove duplicate group expressions
for(int i = select.GroupBy.Count - 1; i >= 0; i--)
{
for(int j = i - 1; j >= 0; j--)
{
if(SqlComparer.AreEqual(select.GroupBy[i], select.GroupBy[j]))
{
select.GroupBy.RemoveAt(i);
break;
}
}
}
select.Having = this.VisitExpression(select.Having);
for(int i = 0, n = select.OrderBy.Count; i < n; i++)
{
select.OrderBy[i].Expression = this.VisitExpression(select.OrderBy[i].Expression);
}
// remove duplicate order expressions
if(select.OrderBy.Count > 0)
{
this.equalizer.BuildEqivalenceMap(select.From);
for(int i = select.OrderBy.Count - 1; i >= 0; i--)
{
for(int j = i - 1; j >= 0; j--)
{
if(this.equalizer.AreEquivalent(select.OrderBy[i].Expression, select.OrderBy[j].Expression))
{
select.OrderBy.RemoveAt(i);
break;
}
}
}
}
select.Top = this.VisitExpression(select.Top);
select.Row = (SqlRow)this.Visit(select.Row);
select.Selection = this.VisitExpression(select.Selection);
return select;
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
base.VisitSelect(@select);
// enforce exact ordering of columns in union selects
SqlUnion union = this.GetUnion(@select.From);
if(union != null)
{
SqlSelect sleft = union.Left as SqlSelect;
SqlSelect sright = union.Right as SqlSelect;
if(sleft != null & sright != null)
{
// preset ordinals to high values (so any unreachable column definition is ordered last)
for(int i = 0, n = sleft.Row.Columns.Count; i < n; i++)
{
sleft.Row.Columns[i].Ordinal = @select.Row.Columns.Count + i;
}
for(int i = 0, n = sright.Row.Columns.Count; i < n; i++)
{
sright.Row.Columns[i].Ordinal = @select.Row.Columns.Count + i;
}
// next assign ordinals to all direct columns in subselects
for(int i = 0, n = @select.Row.Columns.Count; i < n; i++)
{
SqlExprSet es = @select.Row.Columns[i].Expression as SqlExprSet;
if(es != null)
{
for(int e = 0, en = es.Expressions.Count; e < en; e++)
{
SqlColumnRef cr = es.Expressions[e] as SqlColumnRef;
if(cr != null && e >= @select.Row.Columns.Count)
{
cr.Column.Ordinal = i;
}
}
}
}
// next sort columns in left & right subselects
Comparison<SqlColumn> comp = (x, y) => x.Ordinal - y.Ordinal;
sleft.Row.Columns.Sort(comp);
sright.Row.Columns.Sort(comp);
}
}
return @select;
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
// DevDiv 179191
if(@select.Where != null && @select.Where.NodeType == SqlNodeType.Coalesce)
{
SqlBinary bin = (SqlBinary)@select.Where;
if(bin.Right.NodeType == SqlNodeType.Value)
{
SqlValue value = (SqlValue)bin.Right;
if(value.Value != null && value.Value.GetType() == typeof(bool) && (bool)value.Value == false)
{
@select.Where = bin.Left;
}
}
}
return base.VisitSelect(@select);
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
select.From = this.VisitSource(select.From);
select.Where = this.VisitPredicate(select.Where);
for(int i = 0, n = select.GroupBy.Count; i < n; i++)
{
select.GroupBy[i] = this.VisitExpression(select.GroupBy[i]);
}
select.Having = this.VisitPredicate(select.Having);
for(int i = 0, n = select.OrderBy.Count; i < n; i++)
{
select.OrderBy[i].Expression = this.VisitExpression(select.OrderBy[i].Expression);
}
select.Top = this.VisitExpression(select.Top);
select.Row = (SqlRow)this.Visit(select.Row);
// don't visit selection
//select.Selection = this.VisitExpression(select.Selection);
return select;
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
@select = base.VisitSelect(@select);
string[] names = new string[@select.Row.Columns.Count];
for(int i = 0, n = names.Length; i < n; i++)
{
SqlColumn c = @select.Row.Columns[i];
string name = c.Name;
if(name == null)
{
name = SqlNamer.DiscoverName(c);
}
names[i] = name;
c.Name = null;
}
var reservedNames = this.GetColumnNames(@select.OrderBy);
for(int i = 0, n = @select.Row.Columns.Count; i < n; i++)
{
SqlColumn c = @select.Row.Columns[i];
string rootName = names[i];
string name = rootName;
if(this.makeUnique)
{
int iName = 1;
while(!this.IsUniqueName(@select.Row.Columns, reservedNames, c, name))
{
iName++;
name = rootName + iName;
}
}
c.Name = name;
c.Ordinal = i;
}
return @select;
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
if(IsTrivialSelect(@select))
{
SqlSelect aselect = (SqlSelect)((SqlAlias)@select.From).Node;
// build up a column map, so we can rewrite the top-level selection expression
Dictionary<SqlColumn, SqlColumnRef> map = new Dictionary<SqlColumn, SqlColumnRef>();
foreach(SqlColumn c in @select.Row.Columns)
{
SqlColumnRef cref = (SqlColumnRef)c.Expression;
map.Add(c, cref);
// push the interesting column names down (non null)
if(!String.IsNullOrEmpty(c.Name))
{
cref.Column.Name = c.Name;
}
}
aselect.Selection = new ColumnMapper(map).VisitExpression(@select.Selection);
return aselect;
}
return @select;
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
base.VisitSelect(select);
if(select.Top != null)
{
if(select.Top.NodeType == SqlNodeType.Value)
{
SqlValue val = (SqlValue)select.Top;
// convert to literal value for SQL2K compatibility
if(val.IsClientSpecified)
{
select.Top = sql.Value(val.ClrType, val.SqlType, val.Value, false, val.SourceExpression);
}
}
else
{
// cannot be converted to literal value. note that this select is not SQL2K compatible
this.annotations.Add(select.Top, new CompatibilityAnnotation(Strings.SourceExpressionAnnotation(select.Top.SourceExpression), SqlServerProviderMode.Sql2000));
}
}
return select;
}
private static Type GetClrType(SqlNode node)
{
SqlTableValuedFunctionCall tvf = node as SqlTableValuedFunctionCall;
if (tvf != null)
{
return(tvf.RowType.Type);
}
SqlExpression exp = node as SqlExpression;
if (exp != null)
{
if (TypeSystem.IsSequenceType(exp.ClrType))
{
return(TypeSystem.GetElementType(exp.ClrType));
}
return(exp.ClrType);
}
SqlSelect sel = node as SqlSelect;
if (sel != null)
{
return(sel.Selection.ClrType);
}
SqlTable tab = node as SqlTable;
if (tab != null)
{
return(tab.RowType.Type);
}
SqlUnion su = node as SqlUnion;
if (su != null)
{
return(su.GetClrType());
}
throw Error.UnexpectedNode(node.NodeType);
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
@select = base.VisitSelect(@select);
@select.Selection = this.FlattenSelection(@select.Row, false, @select.Selection);
if(@select.GroupBy.Count > 0)
{
this.FlattenGroupBy(@select.GroupBy);
}
if(@select.OrderBy.Count > 0)
{
this.FlattenOrderBy(@select.OrderBy);
}
if(!this.isTopLevel)
{
@select.Selection = new SqlNop(@select.Selection.ClrType, @select.Selection.SqlType, @select.SourceExpression);
}
return @select;
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
// check subqueries first
this.VisitSource(@select.From);
// don't allow lifting through these operations
if(@select.Top != null ||
@select.GroupBy.Count > 0 ||
this.aggregateChecker.HasAggregates(@select) ||
@select.IsDistinct)
{
this.CanLiftAll = false;
}
// only lift predicates that actually reference the aliases
if(this.CanLiftAll && @select.Where != null)
{
bool referencesAliases = this.aliases.ReferencesAny(@select.Where);
if(referencesAliases)
{
if(this.liftedExpressions != null)
{
this.liftedExpressions.Add(@select.Where);
}
if(this.doLifting)
{
if(this.Lifted != null)
this.Lifted = new SqlBinary(SqlNodeType.And, this.Lifted.ClrType, this.Lifted.SqlType, this.Lifted, @select.Where);
else
this.Lifted = @select.Where;
@select.Where = null;
}
}
}
return @select;
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
int i = 0;
List<SqlOrderExpression> orders = @select.OrderBy;
while(i < orders.Count)
{
SqlExpression expr = orders[i].Expression;
while(expr.NodeType == SqlNodeType.DiscriminatedType)
{
expr = ((SqlDiscriminatedType)expr).Discriminator;
}
switch(expr.NodeType)
{
case SqlNodeType.Value:
case SqlNodeType.Parameter:
orders.RemoveAt(i);
break;
default:
++i;
break;
}
}
return base.VisitSelect(@select);
}
// check everything except selection expressions (which will be client or ignored)
internal override SqlSelect VisitSelect(SqlSelect select)
{
return this.VisitSelectCore(select);
}
internal SqlUpdate(SqlSelect select, IEnumerable <SqlAssign> assignments, Expression sourceExpression)
: base(SqlNodeType.Update, sourceExpression)
{
this.Select = select;
this.assignments = new List <SqlAssign>(assignments);
}
private SqlSource PushSourceDown(SqlSource sqlSource, List<SqlColumn> cols)
{
SqlSelect ns = new SqlSelect(new SqlNop(cols[0].ClrType, cols[0].SqlType, sqlSource.SourceExpression), sqlSource, sqlSource.SourceExpression);
ns.Row.Columns.AddRange(cols);
return new SqlAlias(ns);
}
internal SqlDelete(SqlSelect select, Expression sourceExpression)
: base(SqlNodeType.Delete, sourceExpression)
{
this.Select = select;
}
