public virtual SelectExpression PushDownSubquery()
{
_subqueryDepth++;
var subquery = new SelectExpression(_sqlQueryGeneratorFactory, SystemAliasPrefix + _subqueryDepth);
var columnAliasCounter = 0;
foreach (var expression in _projection)
{
var aliasExpression = expression as AliasExpression;
if (aliasExpression != null)
{
var columnExpression = aliasExpression.TryGetColumnExpression();
if (columnExpression != null &&
subquery._projection.OfType <AliasExpression>()
.Any(ae => ae.TryGetColumnExpression()?.Name == columnExpression.Name))
{
aliasExpression.Alias = "c" + columnAliasCounter++;
}
}
else
{
aliasExpression = new AliasExpression("c" + columnAliasCounter++, expression);
}
subquery._projection.Add(aliasExpression);
}
subquery.AddTables(_tables);
subquery.AddToOrderBy(_orderBy);
subquery.Predicate = Predicate;
subquery._limit = _limit;
subquery._offset = _offset;
subquery._isDistinct = _isDistinct;
subquery._subqueryDepth = _subqueryDepth;
subquery.IsProjectStar = IsProjectStar || !subquery._projection.Any();
_limit = null;
_offset = null;
_isDistinct = false;
Predicate = null;
ClearTables();
ClearProjection();
ClearOrderBy();
AddTable(subquery);
return(subquery);
}
public virtual SelectExpression PushDownSubquery()
{
_subqueryDepth++;
var subquery = new SelectExpression(SystemAliasPrefix + _subqueryDepth);
var columnAliasCounter = 0;
// TODO: Only AliasExpressions? Don't unique-ify here.
foreach (var aliasExpression in _projection.OfType <AliasExpression>())
{
var columnExpression = aliasExpression.TryGetColumnExpression();
if (columnExpression != null &&
subquery._projection.OfType <AliasExpression>().Any(ae =>
ae.TryGetColumnExpression()?.Name == columnExpression.Name))
{
aliasExpression.Alias = "c" + columnAliasCounter++;
}
subquery._projection.Add(aliasExpression);
}
subquery.AddTables(_tables);
subquery.AddToOrderBy(_orderBy);
subquery.Predicate = Predicate;
subquery._limit = _limit;
subquery._offset = _offset;
subquery._isDistinct = _isDistinct;
subquery._subqueryDepth = _subqueryDepth;
subquery._projectStar = _projectStar || !subquery._projection.Any();
_limit = null;
_offset = null;
_isDistinct = false;
Predicate = null;
ClearTables();
ClearProjection();
ClearOrderBy();
_projectStar = true;
AddTable(subquery);
return(subquery);
}
public virtual SelectExpression Clone([NotNull] string alias)
{
Check.NotEmpty(alias, nameof(alias));
var selectExpression
= new SelectExpression(_sqlQueryGeneratorFactory, alias)
{
_limit = _limit,
_offset = _offset,
_isDistinct = _isDistinct,
_subqueryDepth = _subqueryDepth,
IsProjectStar = IsProjectStar,
Predicate = Predicate
};
selectExpression._projection.AddRange(_projection);
selectExpression.AddTables(_tables);
selectExpression.AddToOrderBy(_orderBy);
return selectExpression;
}
public virtual SelectExpression Clone([NotNull] string alias)
{
Check.NotEmpty(alias, nameof(alias));
var selectExpression
= new SelectExpression(_sqlQueryGeneratorFactory, alias)
{
_limit = _limit,
_offset = _offset,
_isDistinct = _isDistinct,
_subqueryDepth = _subqueryDepth,
IsProjectStar = IsProjectStar,
Predicate = Predicate
};
selectExpression._projection.AddRange(_projection);
selectExpression.AddTables(_tables);
selectExpression.AddToOrderBy(_orderBy);
return(selectExpression);
}
public virtual SelectExpression PushDownSubquery()
{
_subqueryDepth++;
var subquery = new SelectExpression(_sqlQueryGeneratorFactory, SystemAliasPrefix + _subqueryDepth);
var columnAliasCounter = 0;
foreach (var expression in _projection)
{
var aliasExpression = expression as AliasExpression;
if (aliasExpression != null)
{
var columnExpression = aliasExpression.TryGetColumnExpression();
if (columnExpression != null
&& subquery._projection.OfType<AliasExpression>()
.Any(ae => ae.TryGetColumnExpression()?.Name == columnExpression.Name))
{
aliasExpression.Alias = "c" + columnAliasCounter++;
}
}
else
{
aliasExpression = new AliasExpression("c" + columnAliasCounter++, expression);
}
subquery._projection.Add(aliasExpression);
}
subquery.AddTables(_tables);
subquery.AddToOrderBy(_orderBy);
subquery.Predicate = Predicate;
subquery._limit = _limit;
subquery._offset = _offset;
subquery._isDistinct = _isDistinct;
subquery._subqueryDepth = _subqueryDepth;
subquery.IsProjectStar = IsProjectStar || !subquery._projection.Any();
_limit = null;
_offset = null;
_isDistinct = false;
Predicate = null;
ClearTables();
ClearProjection();
ClearOrderBy();
AddTable(subquery);
return subquery;
}
public virtual SelectExpression PushDownSubquery()
{
_subqueryDepth++;
var subquery = new SelectExpression(SystemAliasPrefix + _subqueryDepth);
var columnAliasCounter = 0;
// TODO: Only AliasExpressions? Don't unique-ify here.
foreach (var aliasExpression in _projection.OfType<AliasExpression>())
{
var columnExpression = aliasExpression.TryGetColumnExpression();
if (columnExpression != null
&& subquery._projection.OfType<AliasExpression>().Any(ae =>
ae.TryGetColumnExpression()?.Name == columnExpression.Name))
{
aliasExpression.Alias = "c" + columnAliasCounter++;
}
subquery._projection.Add(aliasExpression);
}
subquery.AddTables(_tables);
subquery.AddToOrderBy(_orderBy);
subquery.Predicate = Predicate;
subquery._limit = _limit;
subquery._offset = _offset;
subquery._isDistinct = _isDistinct;
subquery._subqueryDepth = _subqueryDepth;
subquery._projectStar = _projectStar || !subquery._projection.Any();
_limit = null;
_offset = null;
_isDistinct = false;
Predicate = null;
ClearTables();
ClearProjection();
ClearOrderBy();
_projectStar = true;
AddTable(subquery);
return subquery;
}
private static void LiftOrderBy(
SelectExpression innerJoinSelectExpression,
SelectExpression targetSelectExpression,
TableExpressionBase innerJoinExpression)
{
foreach (var ordering in innerJoinSelectExpression.OrderBy)
{
var orderingExpression = ordering.Expression;
var aliasExpression = ordering.Expression as AliasExpression;
if (aliasExpression?.Alias != null)
{
var columnExpression = aliasExpression.TryGetColumnExpression();
if (columnExpression != null)
{
orderingExpression
= new ColumnExpression(
aliasExpression.Alias,
columnExpression.Property,
columnExpression.Table);
}
}
var index = innerJoinSelectExpression.AddToProjection(orderingExpression);
var expression = innerJoinSelectExpression.Projection[index];
var newExpression
= targetSelectExpression.UpdateColumnExpression(expression, innerJoinExpression);
targetSelectExpression.AddToOrderBy(new Ordering(newExpression, ordering.OrderingDirection));
}
innerJoinSelectExpression.ClearOrderBy();
}
