internal void Reset()
{
GremlinVariable inputVariable = null;
if (VariableList.First() is GremlinContextVariable)
{
inputVariable = VariableList.First();
}
PivotVariable = null;
Predicates = null;
VariableList.Clear();
TableReferences.Clear();
PathList.Clear();
StepList.Clear();
IsPopulateGremlinPath = false;
CurrentContextPath = null;
ProjectVariablePropertiesList.Clear();
ProjectedProperties.Clear();
//reserve the InputVariable
if (inputVariable != null)
{
VariableList.Add(inputVariable);
}
}
internal void PopulateColumn(GremlinVariableProperty variableProperty, string alias)
{
if (ProjectedProperties.Contains(alias))
{
return;
}
ProjectedProperties.Add(alias);
ProjectVariablePropertiesList.Add(new Tuple <GremlinVariableProperty, string>(variableProperty, alias));
}
internal void Reset()
{
PivotVariable = null;
Predicates = null;
VariableList.Clear();
TableReferences.Clear();
PathList.Clear();
StepList.Clear();
IsPopulateGremlinPath = false;
CurrentContextPath = null;
ProjectVariablePropertiesList.Clear();
ProjectedProperties.Clear();
}
internal List <WSelectElement> GetSelectElement(List <string> ProjectedProperties)
{
var selectElements = new List <WSelectElement>();
if ((PivotVariable is GremlinUnionVariable && HomeVariable is GremlinSideEffectVariable) ||
PivotVariable.GetVariableType() == GremlinVariableType.NULL)
{
selectElements.Add(SqlUtil.GetSelectScalarExpr(SqlUtil.GetStarColumnReferenceExpr()));
return(selectElements);
}
if (ProjectedProperties != null && ProjectedProperties.Count != 0)
{
foreach (var projectProperty in ProjectedProperties)
{
WSelectScalarExpression selectScalarExpr;
if (projectProperty == GremlinKeyword.TableDefaultColumnName)
{
GremlinVariableProperty defaultProjection = PivotVariable.DefaultProjection();
selectScalarExpr = SqlUtil.GetSelectScalarExpr(defaultProjection.ToScalarExpression(), GremlinKeyword.TableDefaultColumnName);
selectElements.Add(selectScalarExpr);
}
else
if (ProjectVariablePropertiesList.All(p => p.Item2 != projectProperty))
{
if (PivotVariable.ProjectedProperties.Contains(projectProperty))
{
WScalarExpression columnExpr =
PivotVariable.GetVariableProperty(projectProperty).ToScalarExpression();
selectScalarExpr = SqlUtil.GetSelectScalarExpr(columnExpr, projectProperty);
selectElements.Add(selectScalarExpr);
}
else
{
selectScalarExpr = SqlUtil.GetSelectScalarExpr(SqlUtil.GetValueExpr(null), projectProperty);
selectElements.Add(selectScalarExpr);
}
}
}
}
else
{
selectElements.Add(SqlUtil.GetSelectScalarExpr(PivotVariable.DefaultProjection().ToScalarExpression(), GremlinKeyword.TableDefaultColumnName));
}
if (IsPopulateGremlinPath)
{
selectElements.Add(SqlUtil.GetSelectScalarExpr(CurrentContextPath.DefaultProjection().ToScalarExpression(), GremlinKeyword.Path));
}
foreach (var item in ProjectVariablePropertiesList)
{
selectElements.Add(SqlUtil.GetSelectScalarExpr(item.Item1.ToScalarExpression(), item.Item2));
}
if (selectElements.Count == 0)
{
if (PivotVariable is GremlinTableVariable ||
(PivotVariable is GremlinUnionVariable && HomeVariable is GremlinSideEffectVariable))
{
selectElements.Add(SqlUtil.GetSelectScalarExpr(SqlUtil.GetStarColumnReferenceExpr()));
}
else if (PivotVariable.GetVariableType() == GremlinVariableType.Table)
{
throw new Exception("Can't process table type");
}
else
{
GremlinVariableProperty defaultProjection = PivotVariable.DefaultProjection();
selectElements.Add(SqlUtil.GetSelectScalarExpr(defaultProjection.ToScalarExpression()));
}
}
return(selectElements);
}
