internal bool IsMultipartIdentifier(out string[] names)
{
if (this._isMultipartIdentifierComputed.HasValue)
{
names = this._names;
return(this._isMultipartIdentifierComputed.Value);
}
this._names = (string[])null;
Identifier leftExpr1 = this._leftExpr as Identifier;
if (leftExpr1 != null)
{
this._names = new string[2]
{
leftExpr1.Name,
this._identifier.Name
}
}
;
DotExpr leftExpr2 = this._leftExpr as DotExpr;
string[] names1;
if (leftExpr2 != null && leftExpr2.IsMultipartIdentifier(out names1))
{
this._names = new string[names1.Length + 1];
names1.CopyTo((Array)this._names, 0);
this._names[this._names.Length - 1] = this._identifier.Name;
}
this._isMultipartIdentifierComputed = new bool?(this._names != null);
names = this._names;
return(this._isMultipartIdentifierComputed.Value);
}
}
internal string InferAliasName(AliasedExpr aliasedExpr, DbExpression convertedExpression)
{
if (aliasedExpr.Alias != null)
{
return(aliasedExpr.Alias.Name);
}
Identifier expr1 = aliasedExpr.Expr as Identifier;
if (expr1 != null)
{
return(expr1.Name);
}
DotExpr expr2 = aliasedExpr.Expr as DotExpr;
string[] names;
if (expr2 != null && expr2.IsMultipartIdentifier(out names))
{
return(names[names.Length - 1]);
}
return(this.CreateNewAlias(convertedExpression));
}
internal bool TryResolveDotExprAsGroupKeyAlternativeName(
DotExpr dotExpr,
out ValueExpression groupKeyResolution)
{
groupKeyResolution = (ValueExpression)null;
string[] names;
ScopeEntry scopeEntry;
int scopeIndex;
if (this.IsInAnyGroupScope() && dotExpr.IsMultipartIdentifier(out names) && this.TryScopeLookup(TypeResolver.GetFullName(names), out scopeEntry, out scopeIndex))
{
IGetAlternativeName getAlternativeName = scopeEntry as IGetAlternativeName;
if (getAlternativeName != null && getAlternativeName.AlternativeName != null && ((IEnumerable <string>)names).SequenceEqual <string>((IEnumerable <string>)getAlternativeName.AlternativeName, (IEqualityComparer <string>) this.NameComparer))
{
this.SetScopeRegionCorrelationFlag(scopeIndex);
groupKeyResolution = new ValueExpression(this.GetExpressionFromScopeEntry(scopeEntry, scopeIndex, TypeResolver.GetFullName(names), dotExpr.ErrCtx));
return(true);
}
}
return(false);
}
/// <summary>
/// Try resolving multipart identifier as an alternative name of a group key (see SemanticAnalyzer.ProcessGroupByClause(...) for more info).
/// </summary>
internal bool TryResolveDotExprAsGroupKeyAlternativeName(DotExpr dotExpr, out ValueExpression groupKeyResolution)
{
groupKeyResolution = null;
string[] names;
ScopeEntry scopeEntry;
int scopeIndex;
if (IsInAnyGroupScope()
&&
dotExpr.IsMultipartIdentifier(out names)
&&
TryScopeLookup(TypeResolver.GetFullName(names), out scopeEntry, out scopeIndex))
{
var iGetAlternativeName = scopeEntry as IGetAlternativeName;
//
// Accept only if names[] match alternative name part by part.
//
if (iGetAlternativeName != null &&
iGetAlternativeName.AlternativeName != null
&&
names.SequenceEqual(iGetAlternativeName.AlternativeName, NameComparer))
{
//
// Set correlation flag
//
SetScopeRegionCorrelationFlag(scopeIndex);
groupKeyResolution =
new ValueExpression(
GetExpressionFromScopeEntry(scopeEntry, scopeIndex, TypeResolver.GetFullName(names), dotExpr.ErrCtx));
return(true);
}
}
return(false);
}