public override void AcceptChildren(WSqlFragmentVisitor visitor)
{
if (FromClause != null)
{
FromClause.Accept(visitor);
}
if (WhereClause != null)
{
WhereClause.Accept(visitor);
}
if (TopRowFilter != null)
{
TopRowFilter.Accept(visitor);
}
if (GroupByClause != null)
{
GroupByClause.Accept(visitor);
}
if (HavingClause != null)
{
HavingClause.Accept(visitor);
}
if (SelectElements != null)
{
var index = 0;
for (var count = SelectElements.Count; index < count; ++index)
{
SelectElements[index].Accept(visitor);
}
}
base.AcceptChildren(visitor);
}
public void TestGroupByClauseAccept()
{
Mock <KoraliumSqlVisitor> mock = new Mock <KoraliumSqlVisitor>();
GroupByClause groupByClause = new GroupByClause();
groupByClause.Accept(mock.Object);
mock.Verify(x => x.VisitGroupByClause(groupByClause));
}
public static GroupByStage GetGroupByStage(
IQueryStage previousStage,
GroupByClause groupByClause,
HashSet <PropertyInfo> usedProperties,
VisitorMetadata visitorMetadata)
{
GroupByVisitor groupByVisitor = new GroupByVisitor(previousStage, visitorMetadata);
groupByClause.Accept(groupByVisitor);
foreach (var property in groupByVisitor.UsedProperties)
{
usedProperties.Add(property);
}
var expressions = groupByVisitor.GroupByExpressions;
var propertyTypes = expressions.Select(x => x.Expression.Type).ToArray();
var tupleType = GetTupleType(propertyTypes);
var builder = SqlTypeInfo.NewBuilder();
var tupleProperties = tupleType.GetProperties();
for (int i = 0; i < expressions.Count; i++)
{
builder.AddProperty(expressions[i].Name, tupleProperties[i], expressions[i].OriginalProperty);
}
var groupingType = GetGroupingType(tupleType, previousStage.CurrentType);
var constructor = tupleType.GetConstructor(propertyTypes);
var groupByExpression = Expression.New(constructor, expressions.Select(x => x.Expression));
var groupParameter = Expression.Parameter(groupingType);
var keyPropertyInfo = groupingType.GetProperty("Key");
var keyParameterExpression = Expression.MakeMemberAccess(groupParameter, keyPropertyInfo);
return(new GroupByStage(
groupingType,
previousStage.CurrentType,
previousStage.TypeInfo,
builder.Build(),
groupParameter,
keyParameterExpression,
previousStage.ParameterExpression,
groupByExpression,
tupleType,
previousStage.FromAliases
));
}
