public static ProjectedColumns ProjectColumns(QueryLanguage language, ProjectionAffinity affinity, Expression expression, IEnumerable <ColumnDeclaration> existingColumns, TableAlias newAlias, IEnumerable <TableAlias> existingAliases)
{
ColumnProjector projector = new ColumnProjector(language, affinity, expression, existingColumns, newAlias, existingAliases);
Expression expr = projector.Visit(expression);
return(new ProjectedColumns(expr, projector.columns.AsReadOnly()));
}
private Nominator(QueryLanguage language, ProjectionAffinity affinity)
{
this.language = language;
this.affinity = affinity;
this.candidates = new HashSet <Expression>();
this.isBlocked = false;
}
internal static HashSet <Expression> Nominate(QueryLanguage language, ProjectionAffinity affinity, Expression expression)
{
Nominator nominator = new Nominator(language, affinity);
nominator.Visit(expression);
return(nominator.candidates);
}
private ColumnProjector(QueryLanguage language, ProjectionAffinity affinity, Expression expression, IEnumerable <ColumnDeclaration> existingColumns, TableAlias newAlias, IEnumerable <TableAlias> existingAliases)
{
this.language = language;
this.newAlias = newAlias;
this.existingAliases = new HashSet <TableAlias>(existingAliases);
this.map = new Dictionary <ColumnExpression, ColumnExpression>();
if (existingColumns != null)
{
this.columns = new List <ColumnDeclaration>(existingColumns);
this.columnNames = new HashSet <string>(existingColumns.Select(c => c.Name));
}
else
{
this.columns = new List <ColumnDeclaration>();
this.columnNames = new HashSet <string>();
}
this.candidates = Nominator.Nominate(language, affinity, expression);
}
public static ProjectedColumns ProjectColumns(QueryLanguage language, ProjectionAffinity affinity, Expression expression, IEnumerable <ColumnDeclaration> existingColumns, TableAlias newAlias, params TableAlias[] existingAliases)
{
return(ProjectColumns(language, affinity, expression, existingColumns, newAlias, (IEnumerable <TableAlias>)existingAliases));
}
