public static HashSet <string> Gather(Expression source) { var aliasesProduced = new AliasesProduced(); aliasesProduced.Visit(source); return(aliasesProduced.aliases); }
protected override Expression VisitSelect(SqlSelectExpression select) { var saveIsOuterMostSelect = this.isOuterMostSelect; try { this.isOuterMostSelect = false; select = (SqlSelectExpression)base.VisitSelect(select); var hasOrderBy = select.OrderBy != null && select.OrderBy.Count > 0; if (hasOrderBy) { this.PrependOrderings(select.OrderBy.Select(c => (SqlOrderByExpression)c)); } var canHaveOrderBy = saveIsOuterMostSelect && !SqlExpressionFinder.FindExists(select, c => c.NodeType == (ExpressionType)SqlExpressionType.Aggregate || c.NodeType == (ExpressionType)SqlExpressionType.AggregateSubquery); var canPassOnOrderings = !saveIsOuterMostSelect; var columns = select.Columns; IEnumerable <Expression> orderings = (canHaveOrderBy) ? this.gatheredOrderings : null; if (this.gatheredOrderings != null) { if (canPassOnOrderings) { var producedAliases = AliasesProduced.Gather(select.From); var project = this.RebindOrderings(this.gatheredOrderings, select.Alias, producedAliases, select.Columns); this.gatheredOrderings = project.Orderings; columns = project.Columns; } else { this.gatheredOrderings = null; } } if (orderings != select.OrderBy || columns != select.Columns) { select = new SqlSelectExpression(select.Type, select.Alias, columns, select.From, select.Where, orderings, select.GroupBy, select.Distinct, select.Skip, select.Take, select.ForUpdate); } return(select); } finally { this.isOuterMostSelect = saveIsOuterMostSelect; } }
public static HashSet<string> Gather(Expression source) { var aliasesProduced = new AliasesProduced(); aliasesProduced.Visit(source); return aliasesProduced.aliases; }